Cat Engine Won't Start Troubleshooting. Diesel Engine Crank No Start.

[@robertpardo1100]

Hello adapt ape, just wanted to tell you thank you for all the informational and educational videos you post. I am by part a aviation Mechanic myself, and it seems that to me that the semi-truck industry has a lock down on information they just don't want you to find or get a hold of. it's almost like a secret clearance that you need just to get manuals for your truck. I've worked on line maintenance for ch-47, and oh-58d for the army and we've never worked on aircraft without our manuals. I'm now a truck driver, just wanting to say keep up the good deeds.. I own a c15 that's always giving me problems and these videos help me all the time. God speed my friend.. land of the free, home of the brave..

[@AdeptApe]

+Robert Pardo Thanks for the kind words. I like hearing that people enjoy the videos. The info is hard to find I think because it is a much smaller market than the auto industry, but I like doing the videos and I'll keep putting them out as long as people watch them.

[@surfranger1]

that is right Robert,,,, secret society Trucks , Trailers..... I am cat truck engine analyst and yes so many technical advancements that lots never even comprehend. all engines have same basic operation, yet the manufactures all have different ideas and ways of ussing sensors to make the electronics operate. For me Caterpillar is a very high standard of technology, yet can be worked on and lot of backup in literature, manuals parts systems,. Think engine technology is hard to source infomation, try getting chassis alignment, steering and suspension geometry settings from the truck, trailer manufactures.

[@deanberolzheimer2658]

I am working on an 07 Sterling C13, crank no start. I had my fuel guage hooked up and was cranking to try and get a reading when my foot slipped off the clutch pedal and she started! Guess what? It was the clutch safety switch, DOH! Adept, my brother....you have saved my life so many times, I can't begin to thank you. U da Man!

[@RD-xe6sf]

Adept Ape, Great informative videos, hopefully they will not throw me out of the shop when I ask what steps they will be taking to diagnose my no start on a CAT 3176B in a motorhome. I absolutely do not want them throwing parts at it without good diagnosis. Your videos have given me a better understanding of what they should be doing. Keep up the great work.

[@kingjames8283]

With my experience, fuel lines, fuel filters, and return rail pressure regulator (check valve), and dirty ECM Power leads from battery are the biggest culprits. The only ECM's I have ever had fail were the Cummins N14 due to failed injector drivers. I've had very good luck with Detroit Diesel and CAT ECM's. After last Friday's failure of OPS sensor, I have now replaced all my sensors including TRS, SRS, CLS, CTS, FTS, and both air intake sensors. With new bearings, cyl-kits, and injectors, I am good for another million miles of service.

[@karennarine5605]

James Barrow I

[@josephgonzalez8835]

C15 and 3406E. On both them performed a cylinder head replacement and rebuild and after putting it back together wouldn’t start.(crank no start) Fuel pressure ok and no engine codes. Cam sensor was the issue both times. Weird it never logged a code but just fyi for anyone who runs into this

[@iwishtobetexan6060]

What was the fix?

[@twentytwogunz8142]

@@iwishtobetexan6060cam sensor

[@Toesmack1]

Just spent a sleepless night in central Nevada (aka major BFE) after my 3126 refused to start. In the morning I was able to contact some of my diesel tech contacts, First suggestion most of them had was to unplug the HUEI sensor. This is located on the front of the head on the drivers side next to the valve cover. I understand this sensor can fail and cause a no start. Didn't cure my problem, however one of the top techs from Peterbilt in Sparks, NV suggested I go after the fuel pressure regulator and check valve located on the back of the head. Very well hidden by the way. Easy on a diesel pusher coach, but on a FL60 big PITA. Did get it pulled out and cleaned and freed up. Real pain to bleed air from system afterward but it fired and ran great! No start? Try the check valve back of the head. Saved me a $2,000+ towing charge.

[@Gcal1956]

This is exactly why, as an owner operator, I run a 07 truck and refuse to buy a new truck with all the sensors. You can trouble shoot and repair these engines with out being a super tech with a super computer. When your in Wyoming during a snow storm and you get a ck light on, your fked LOL Or Northern NV or Even BFE Canada...your in major trouble. But you have hope with a older truck. A 3406 b or e or a 12.7 detriot or even a n14 will all allow you to make it to a safe space even if you have engine issues. With the new trucks, your on a tow truck quicker then you can say FUtruck! Then prepare for the beating your gonna take at the shop in Diag time and then parts and service time. Dont even get me started on Volvo engines , paccar, mack engines or 08-10 isx junks. They should go to jail for selling those to people.

[@bobbybulan8472]

U r a moron Volvo motors are the best so far they still schools North America how to build a decent motor and Mercedes schools Detroit how to build a decent motor the cat garbage it got lucky whit international they got bought so STFU u moron and keep changing 2 turbo s in the same time

[@babytunechi00]

Lee Hill 🤣😂🤣

[@johnnyturbo8460]

Whats the most likely issue if your CAT 3208 wont start? It runs off of starting fluid when sprayed into the intake, but once it runs the starting fluid out it dies.. I blead all the injectors and they all have diesal flowing from them. It has plunty of diesel inthe tanks... The fuel filter is full and primed

[@michaeldunagan8268]

The tow job should be a beating also... I'm just reminding....

[@RevAldea]

I did note that you had not checked the fuel filter output. I personally found many cold engine start fails to be week flow fuel filters mostly show up during cold start durring cold to very cold weather this is mostly GMC, Kuibotas, Oliverse, Mann, and many Euro's Diesels, American's units as well any other throughout my world travels {US Army} but only two "Cat's TA 1697" please keep up this good work I am retired Diesel mechanic and I started back when D5 Cat's had to be started by torch heatting cylinder glow rods during the middle 1950's. Most Diesel fuel is very dirty even right out of the station pumps. Oh I almost forgot to say about clouding of cold fuel was not present in nearly every case.

[@pfckamphuis9298]

Watched your video and went out and started going through the list. Found a green corrosion power wire rotted off. You make great videos that are easy to follow. Great work and thank you very much !!

[@AdeptApe]

Glad it helped you out 😊

[@TheSubpremeState]

I think this is the best video on engines i've seen. Takes into consideration that not all of us have expensive equipment

[@HG-or5nf]

Mr. Adept Ape..your vids you were part of our course, Heavy Duty Diesel Engine Specialist Program in TSTC in Harlingen, Tx...learned alot from you. I graduated the program and got certified but I can't find a job yet. When I DO get one I'll donate. Good vids.

[@AdeptApe]

+Hector Garibay My videos are part of a curriculum? That is cool to hear, maybe I'll be a teacher one day, that would be fun. Maybe our paths will cross one day, I wish you good luck in finding a job.

[@HG-or5nf]

You're already a teacher,you just didn't know yet...I'm watching your vids every other day as a refresher...thanks.

[@proxies423]

hey boss call me in here in Edinburgh and I'm getting a f650 cat here Monday. I need help with it it won't start only if u spray it it will call me 1773-949-5142 Robert

[@michaelgarcia5693]

Im doing research for Caterpillar and your videos have been very helpful! I'm going to keep watching and gaining insights from what you do.

[@AdeptApe]

+Michael Garcia Thank you for watching, what is the research for?

[@michaelgarcia5693]

My team and I are looking into what Caterpillar can do to provide better, more reliable information to its customers when it comes to the areas of maintenance and fleet management.

[@AdeptApe]

Sounds pretty interesting, hope you like the videos.

[@sindhengineering5197]

Greatest searching true best thanks

[@sindhengineering5197]

Thanks for sharing

[@edwardjames6837]

I too am a diesel mechanic but on earthmoving equipment for about 30 years now love your programs very informative

[@tanyahyppolite1590]

Can you give me an idea of why a caterpillar d8r engine is not cranking.

[@rugerallworth9645]

We have been having this problem with our truck. crank no start, been using either to get it started. Been doing this for at least six months and it is driving us crazy. It is the cat 3126 in a sterling. Thanks for taking time to share your knowledge! I will be back.

[@AdeptApe]

+Ruger Allworth Sounds like you might have a weak or dead injector when cold. Is the intake heater coming on?

[@alexkolker]

This is my issue as well and same truck.

[@ocwhaywood6567]

HEY I GOT A C15 HAVE HELL START IT AFTER SET HAVE TO USE EITHER TO GET START I HAVE CHANGE CHECK VAL WHAT ELISE I NEED TO DO TO DAT RACAL?

[@mauriciogonzalez9000]

As a 91B, thank you 🙏🏽

[@damianhuff7179]

DD-214

[@scottnelson9550]

Hey buddy I got 3126 it will cold start but no hot start only 500 psi from heui pump so I changed it still no hot start when no start not getting power to injector wires unless I unplug the three wire injection actuator sensor then the ecm starts to send some power to injector wires but no start. I’m at a loss right now and advise would be very appreciated thanks.

[@thomascannon6324]

Hey my name is Thomas my best friend he owns a tree company. He has a 05 C7 I stumbled upon your videos and find them absolutely great man I personally am on Social Security when I get my check I will be sure to send it or Nation thank you for taking the time to make these videos

[@1brtucker]

I love your calmness and teaching skill....keep up your channel.

[@AdeptApe]

+Mark Tucker Thank you.

[@rickl6697]

Our RV, a 2003 Newmar Dutch Star on a Freightliner chassis and only one fuel filter with no fittings on it. It doesn't even have a primer pump. We had the situation you described that there was no tach movement during the cranking(only a very small twitch when I started to crank it then it was on zero) After about 12 attempts it started (and the tach signal came up to 2-300 rpm at the very beginning of the starting attempt. It does this occasionally but I've never noticed what the tach was doing. Once it cranks up it's fine and there have not been any codes. (It had been raining at the campground almost every day for 4 or 5 days. Thanks Josh.

[@Nudnik1]

have that Klein induction meter. Never thought to use it Thanks!!! I just fixed a small Perkins CAT in a JLG boom lift. The rpm sensor for electronic governor counts teeth on flywheel. Metal chips covered sensor magnet from starter flywheel usage causing machine to over rev and shut down. No dealer could fix it no trouble codes appeared It found problem after alot of testing and deduction.I got machine cheap because no one could solve. Now perfect. Excellent work thanks!!!

[@raneilbrooks9267]

Man thanks you for this video excellent explanation been trying to get a car 11 to start for 2 weeks from this video I replaced the ecm and the truck started right up this morning thanks

[@ISELLHH]

Great video! I've had a crank/ no start issue on my motor home twice. Both times it was the 20 amp fuse near located near battery that energizes the ACM. (bad connection) The only way I found problem was when I called Freightliner 27/7. The first thing they had me check was the ACM fuse. Just thought I mention this.

[@AdeptApe]

+Rob Neil ECM power issues are one of the biggest reasons for them not starting, thanks for commenting.

[@ballardstowingandoffroadre2367]

Can someone send a picture of this fuse ?? I have several on my RV and it's not starting. Battery went dead and was dead for several months ! Now no start without Starting Fluid and will die when the starting fluid is stopped !!. Please help. 1997 Cat 3126 with the HUEY system.

[@halfmoon5022]

@@AdeptApe Ok. So, I am in the exact situation as most others. We did everything in this video as well as your fuel video. MXS Acert. New fuel pump, new injector harnesses, filters, fp regulator, check valves hoses, injector Orings, ran the rack, bucket test from fuel pump, new starter, new batteries, all fuses are good. No start. Had a tech come out and hook up to data port. It ran on ether until no ether. Laptop recorded all 6 injector low voltage fault. All guage work. Fuel pressure 85, oil pressure good while running on ether. Scanner reads all 6 injector fault. Technician say either engine harness or ECM.

[@chogan2835]

Hi I can’t say enough about your site you have I watch almost every video and search for videos that I’m having problems with and I usually find it and fix my problem, I’d love too have you work on my truck but I don’t run to USA much anymore Thanks for your vids and time you take to do this you’re such a honest guy thx man lol Talking to my phone most of that was what I was saying but missed my question to you Soooooo…. Had it in for service and got a call truck wasn’t starting and to find out they said my fuel pump was faulty after they kept cranking it and cranking it their fault but I paid…. Question is their cost or mine ?? Oh and they broke the fuel hand valve as well my cost or theirs ?? That’s where the honest comes in.

[@terryhadley3181]

Thanks for the video, it didn't cover my MUI system but I do have a better understanding of what to look for.

[@TERoss-jk9ny]

I’ve got a 3406A cat in a 74 cabover pete. Ran great, but I flipped a toggle switch on the shift tower that says “Engine Start”. Since then? No fire.... ie; no fuel to the rack. Plenty of fuel. And help is great!

[@johngoldsmith6629]

Do you have an air over electric shut off? Or a electric shut off? Never heard of a toggle switch that you have on shift tower. When air bleed off these, they would start until air built back up. (No power or failed shut off). Electric you held the button until the engine shut off. Some of these had a manual cable that you pulled and shut the fuel off. Take the end cover off the pump (front side). Two 1/2 head bolts. You can leave the tach bolt in, loosen the inside bolt and flip the cover up. See if the rack moves. If all the way in, it is in the shut off position. Should be able to push it in and return back. If it won't move at all your rack is stuck and I would not try and start the engine until you figure out the problem.

[@josephrichards1099]

Hey Adept Ape,love all the educational videos that you put out. They're great. But could you put out some more hands on videos for us to enjoy. Thanks.

[@wadehicks9270]

I've never owned a diesel powered vehicle but just knowing how they operate is good information to have. I do have a question, since the ECM is prone to fail is that more or less a design issue they have or the environment they operate in. Kinda curious about about that.

[@AdeptApe]

+wade hicks The ECM on a Cat might run for 15 years without a problem, but they do fail. It is mostly just the computer is doing a lot. It has to control the high voltage going to the injectors, as well as all the sensor inputs, in a dusty, high vibration, and hot environment. It's surprising they last as long as they do. They are fairly expensive though.

[@wadehicks9270]

Adept Ape 15 years is a lotta life. I misunderstood the amount of time. my bad. How Diesel engines work is quite interesting. Thanks for your time.

[@jaydunbar7538]

wade hicks my truck is a 96 and has original ecm, 22 years old and still doing its thing.

[@joeziahbabb]

@@AdeptApe Have you tried baking the ECM at 385degrees in a preheated oven for 8-10 minutes? Obviously take any bits off that would melt at that temperature, this resets the soldering and in most cases fixes most computer related issues, I would assume the same principle would apply to a ECM.

[@slowpoke96Z28]

This heui tech is hella throwback lol. I usually see duramaxes, but every now and then I see a cat. Needed this a couple days ago...

[@unknowntoman6855]

I have a 97 topkick gmc it want crank i spray started fluid it turn on n shut dont what could it b ?

[@slowpoke96Z28]

@@unknowntoman6855 what engine?

[@Watchyn_Yarwood]

I really like your new intro!

[@AdeptApe]

+William Garrett Thank you.

[@darkheartkain]

Bought the gauge through your link. Hope it helps you out.

[@codysellers604]

Man I appreciate your videos and so do my mechanics. Your grandfather's father must have worked on CATS because you know your shit! Excuse my language but it's impressive. Will be subscribing. Also I have a few questions if you are ever able to find time.

[@jerrymozo3875]

Nice explanation brother

[@opelmecrazy4398]

I have a c7 that is difficult to start cold even when it 60’ F. Will give whiteish smoke when cranking and sometimes needs either. Once it starts it runs excellent and fires up fine when warmed up. Any ideas what could cause this? Thanks so much! -David

[@Cybob420]

Hey thanks for making these videos i have been watching them and they are really helping me understand more about some of the Cat stuff, I also get to start my apprenticeship at my Cat dealer over here in NZ in jan so these vids will be heaps of help. Thanks and keep up the great work!!

[@AdeptApe]

+Mark Stringer Best of luck to you on your apprenticeship.

[@julionajera8794]

@@AdeptApe hey man thancks for you videos

[@QuantumRift]

Had a starting issue like this on my CAT 3126 diesel pusher....it started, drove fine for about 45 miles, then would not start...it would crank but would not run. Of course, we were not home so we had to have it looked at by the RV place, which then had it towed to a Freightliner dealer. We had a wiring problem, and did not have proper schematics than. Up underneath the back end, behind the maintenance panel, there a lot of wiring to the remote start/start stop switches, etc. Over the years, many of the connectors had become corroded or broken. SO the service tech, eventually bypassed this wiring. In this wiring, there hangs what is called the "STOP RELAY"...its just a cheap 5 terminal relay that can be wired as normally open or normally closed. Between the wiring and relay, the wires had shifted around so that the 'normally open" circuit was closed (thus killing the engine). The service tech wired around this at a substantial cost ($140/hr) so that it always starts OK. After we got it home and I got up under it and started looking around, I discovered the real problem (as I now have detailed schematics). OF course the motorhome is 21 years old, and was parked by my dad back in 2011-2102....and we are resurrecting it...(my dad passed away a couple of years ago) as my mom wants to take a trip to FL in it.....

[@AdeptApe]

+QuantumRift I've had to "custom fix" many RV electrical systems like that because finding wiring diagrams for them can literally be impossible. As long as it is wired professionally it should work.

[@1HSYURIDIA]

GREAT VIDEO, NEST THAT CAT DEALER CAN EXPLAIN,

[@Robodiver66]

Please add some video for older models, I have a 1998 GMC supposedly with a Cat 3126. Just want to know how to drain old fuel out of everything past the filter and get good fuel to the system from there. Did a tank removal, cleaning and have the new fuel filter. I know enough to add diesel to the filter but I want all that old junk out of the lines right?

[@TundeAbiola-us5or]

Thanks for your training. Very educative. Please, I have a cat c 7.1 Marine gen set that couldn't start. I connected cat ET to it and showed that the fuel rail pressure was zero while cracking, and there were no active or logged faults codes recorded. Solenoid test shows ok. I have replaced all the unit injectors and the injection pump, and the engine still records zero fuel rail pressure. What is your advice, please? Thanks

[@dustinmason4678]

U are awesome 👌 thanks from Dustin Mason my problem was ecm wire u led me right to it ! Much love

[@DavidWoodward-eb4ed]

Thanks for all you do to help us fix our Cat engines….. Cat C7 Question, why wont my Cat C7 start when it gets hot? Starts perfect, but wont re start when hot

[@jmpressurewashingroofclean1308]

You make great videos with correct info! 🤙

[@AndyReynoldsSells4Me]

Thanks for you dedication to helping us! I just purchased a 1997 Motorhome with 60K miles on a 3126B that cranks but will not start unless starting fluid is used, once it starts it will run just fine as long as you maintain greater than 1000 rpms, no smoking and engine runs smooth above 1000. If you ease up on the gas pedal to below 1000 rpms the engine shuts off, you can not feather or pump the pedal to keep it going, it is seems like an instant loss of spark/fire. Owner before me says he changed the HEUI pump and it did not correct the problem. Any thoughts?

[@reynaldoclaveria100]

please let me know sir, I want to buy this tool for checking common rail diesel injector pulse. I admire your kindness for sharing, and teaching how to works on caterpillar equipment.

[@ch4pterzinc133]

Very helpful video man, thanks.

[@chriszbodula1894]

Have a 1998 Chevy C6500 truck with a 3126 that was running when parked but sat for 5-years. Runs on ether. Manual pressure pump (primer) pumps up hard. No power to magnetic solenoid but all fuses show good. Directly powered the solenoid but no start. Would really appreciate a direction to go in. Kinda in a hurry to get running

[@reynaldoclaveria100]

Hello Adept Ape! what is the exact model of this klein inductive volt meter you are using to test injector pulse of caterpillar?

[@s.taylor7412]

I have a C7 ACERT in a FMTV military truck-No fuel pressure at all and I swapped out the fuel pressure regulator. I have not yet checked fuel pressure out of transfer pump. Vehicle has been sitting a long time and fuel was contaminated with water and even had some rust in pri @ sec fuel filters. I filled the tank with good fuel and changed the filters.. Zero pressure at secondary fuel filters. Best to change HEUI pump AND injectors?

[@roberteilo]

from your experience with Caterpillar engines at how many revolutions do you recommend working

[@doranvee5944]

Excellent video and thanks for great simple explanations.

[@ja9161]

Great information. I have a 2008 C7 that starts and runs great for about 1 hour, then the check engine comes on and off then the engine shuts down. It does not overheat. It will crank but not restart until the next day. I've changed the fuel filter , water separator, temperature sensor, fuel back flow valve, drained fuel tank and cleaned checked fuel lines. Could it be the ECM or a relay?

[@SoniaShockman-z3k]

Hello Adapt ape, I have a question for you. I have a 1996 cat 3406e and looking for the compucheck fitting location. My does not have the fitting. Where would i locate it. I have the CAT 3406E Fuel Filter Base With Bracket And Seperate Fuel Filter Housing.

[@jonmoon9479]

This video was extremely helpful

[@mayorbetter7915]

This video is very educative

[@cedriclee-carter8809]

Bro I seriously need your help my 6nz will not start I've spent over 2k and got no where it cranks and runs on ether and brake cleaner but will not start I've checked out everything mechanically all injectors work 82lbs of fuel pressure pump and everything works return line has fuel rpms work while starting did the blink test and came up with code 62 for low coolant added coolant still no start and no other codes available even added another ecm and got nothing I am so confused please help

[@halfmoon5022]

What was the remedy?

[@cedriclee-carter8809]

Think it might be the pump I'm replacing pump lines and check valves if it dont start then it off to cat I'm tired

[@gregmiller1206]

Hi Josh. Does the power probe you use in the video measure DC voltage as well as AC voltage or voltage from any any source of polarity?

[@lorenkeithmartin5176]

I have a 1999 3126 that has faults on all 6 injectors. I tried putting the test light in the wiring harness where it goes into engine. The light flickered just like yours did on the video. So could it still be my ECM even though I’m getting voltage on the wires? Also we tried a test ECM from a local diesel mechanic but the engine still didn’t run. Our local cat dealer seems to think we have a short in wiring underneath the valve cover. Any info you could give me would be greatly appreciated.

[@pedicabchicago4265]

What do you think about pre engine heater (coolant engine heater)

[@roostersofer5759]

What if you own a older caterpillar D3c like I do. It has no check engine lights and such. Cranks great just won't run. Fuel smoke come out the pipe a little. Ran fine after I changed oil and fuel filters. Cut it off after about 20 minutes. Tow weeks later it won't start.

[@reynaldoclaveria100]

thank you sir for sharing your knowledge. this is excellent video i appreciated very much.

[@ch4pterzinc133]

Wow! Just saw how fast this channel is growing.

[@AdeptApe]

+Ch4pterz Inc Something happened a week ago, my "Why Do Diesel Engines Last So Long." Just started getting a lot of views out of nowhere and lots more subscribers. I can barely read all the comments now. 10,000 subscribers here we come.

[@ch4pterzinc133]

Thats great!

[@enginemaster01]

it's about time. most young mechanics go straight to the computer

[@benitodisla8817]

Hi, thank you for posting this video, I have a 2005 Chevy Truck C6500, when I just got the truck it was good, then after it start smoking a lot, running very slow, then it crank but don’t start any more. Can please tell me what I can do to fix it or make it start again. Thank you

[@3459jason]

Thanks for your videos very helpful. I do have a question about a cat c12 I have now for 6 years. It has only failed to start twice and mysteriously, after I let it sit, and then it started. I did have fuel pressure but it just wouldn't fire. Would be interested in knowing what I can do if it happens to do it again. Thanks

[@nealk6387]

good video, only thing is you are unable to see system voltage. if there is any corrosion present it can cause voltage drop. load pro test leads with a dmm kick ass testing this circuit because it works on voltage drop. look into this tool. not expensive.

[@Waffle_cones]

Could you do a video on a 1995 3176 that has been sitting up for a couple. years, I could pay you for it?

[@dewalttoycollector]

Hello. I have a c7 in a GMC c7500 and I’ve been trying to get it started for about two months now. I replaced the HUIE pump and installed the filter you reviewed that goes after the pump. I also replaced the ECM because there was no connection to a scanner. It has started a total of three times using ether to get it started but only runs for about three minutes then dies and won’t start. If you have any suggestion I would really appreciate the help. Thank you.

[@Sproutt]

Hey there adaptive ape, i have 2001 ram cummins and its been sittin and im wondering if i need to clean out my injector lines before i starting trying to crank it over. Im worried about plugging up the injectors (algea ect....) and i live in Arizona, not sure if being hot effects anything

[@jameswaters313]

I have a 3126. The oil pressure light came on and it shut down right at the intersection. We got it pulled off to the side of the road. Cranks but no start. I've tried priming the fuel with no luck. Any advice to get this truck to fire?

[@shawnmarks1400]

Great videos, I got a good one for you I have an 07 C7 in a Freightliner that intermittently won't start especially after first start up but as soon as you use the smallest amount of starting fluid it'll fire right up i was thinking its the TDC sensor but there's no codes or lights on and I would love to have your opinion on the situation thanks and again great videos

[@AdeptApe]

+shawn marks Well that could be a tough one. My guess would be one or more injectors that don't fire under cranking conditions, once you get the rpms a little higher though they fire. So hard to troubleshoot without seeing what the sensors are reading though. I would see what the HEUI pressure and fuel pressure are while cranking, then just stay eliminating systems. Cats rarely don't start because of sensors, especially with no check engine lights on.

[@shawnmarks1400]

Adept Ape that was my thoughts at first but I've checked fuel and huei pressure and both are good I have the Cat fuel pressure gauge everything everything else was checked through a generic scanner but would it run with a bad huei pump after starting fluid because if I just give it a small squirt it starts and runs all day long as you don't shut it down. this ones got me stumped so I figured start on the cheapest stuff but I really appreciate you getting back to me

[@AdeptApe]

+shawn marks If your pressures are good then you must likely have a couple weak injectors that aren't firing at cranking. Unfortunately I'm not sure how you would identify which ones without doing an injection actuation test using Cat ET.

[@warrenphipps2648]

My 3406e starts up quite nice and ok but it won't shut down when I switch the ignition off, I have to stall it to shut her down, can you tell me anything about that, thanks

[@jessebejarano7146]

hi my name is jess. at my job someone cross neg to poss on battery's on a fl70 3126 eng, buzzer stays on and wont start, not getting cold start fuel igniter on and neg power to injection driver even when key off. can u help me,,

[@jasong1381]

Could you provide a link where you could find a good cat fuel pressure check gauge like the one you use in videos! What did you call the connection point? A comp u check valve?

[@100sooperdooper]

Thanks so much for your videos. I have a question: 2001 3126B with no crank, no start. was intermittent, then complete no start. In Thomas chassis (front engine, flat nose). Engine serial number CKM24206. Batteries 12.6V, contact/wires good, just replaced starter... now it's beeping and showing EPS stop engine when key is in 1st position. Oil level is 1/3 of the way between "add" and"full". Driver for HEUI: Approximately 11 ohms (engine off). Has 1/2 tank of diesel fuel. Oil pressure may be low...what is expected starting/running? It's like 5-10 running. Sorry for huge comment, please help, appreciate your videos, please respond asap.

[@AdeptApe]

+100sooperdooper oil pressure is 5 psi running! That is super low. Check that first, that can cause no HEUI pressure.

[@johnnycotrel7413]

Howdy. I am working on a 2004 dump truck with a 3406E cat engine. Having issues with it priming up. The fuel housing was replaced,the hand pump replaced,new filters, the return pressure valve replaced. What's weird is we changed a bunch of that stuff and got the truck running and they used it for a few hours hauling loads consistently until they quit that night and it worked great but in the morning it wouldn't start for them again,they tried priming it and nothing so went back over and tightened a couple fittings that appeared might have been loose just a little and it actually started up for us so we left while it was still running etc.. Well they only got down the road less than a mile and it stalled and wouldn't start back up. Well as of now it still won't start with the exception it will on starting fluid but will stall right out and even when running on ether there was no throttle response either.Any suggestions would be awesome.Thank you.

[@raulcalderon9048]

Were you able to find the issue? Same exact issue, ran our 3406B a couple hours today and then suddenly died. Only cranks, im replacing the fuel transfer pump tomorrow.

[@donniebargo964]

On the 3126b I just did an out of frame overhaul on it I however have no fuel pressure 1821 pounds and you have to crank it forever to get there with it

[@thomascannon6324]

I left you a video about the tree service truck it cut off my comment I rebuilt the Huey pump over I just replaced him over things that had a oil leak but by the time I got around to getting everything back together the truck has been sitting almost a month and I have a no start. I didn't have any issues but a o ring that was pouring out oil.

[@AdeptApe]

You should email me technical questions at [e-mail] the comments section is a bad place for them.

[@mikeg2178]

Hello Sir, I recently acquired a 2003 M2 Freightliner. I have found your videos most helpful with my C7. I seem to have a problem for which I have not found much if any information on. I have watched videos on cold or first start issues, which mine has but after the first start in the morning she starts up fine. My biggest issue is that the engine won’t shut off when the ignition switch is turned off, I have to pull the ecm fuse in order to shut her down. Any help in this matter would be greatly appreciated, I’m not sure where to start looking. Thank you for your time and great informational videos.

[@cecilmayers3429]

If it runs through an ignition relay to send voltage to the ecu to wake it up the relay contacts may be stuck on

[@RonnieWhite-i2t]

My fuel senoild is not getting power on a 3126. Fuse good and power leaves the fuse on wire # 99. Does this power go through the ECM?

[@kevintran3758]

Good morning sir. I have a problems with my 2004 F750 C7 w 32,000 miles. it been happened for couple weeks. 5 out of 10 times. when I turn the key to start, it cranks but not start. than I turn the key to off & turn to start again the 2nd times, it will start & runs with no problem . it happen even engine been running for few hrs. it also happened twice. engine start the first time I crank the key, but it runs very rough at idle . then I turn it off & restart it again the 2nd times than it runs with no problems for all day. Thank you!

[@Lerxry]

Help. 2000 C15 Cat 379 stopped on highway lost power like battery arched. Put in new ECM put in a new accessory relay. Replaced a broken driverside frame rail ground and all 4 batteries r 12 volts. Alternator had dc volts. Tested all cab fuses replaced only one all good. Tried to crack my fuel return but the nut only moved back and forth could not remove that line fuel return. Also tested my ECM plug and pin 70 lit up plus 2 more pins 57 4th pin from right and pin 47 4th from left. Do i still have a bad ground or bad ecm wiring. Cranks but wont start cranks but wont.

[@sameuljones5496]

I want to buy that Klein voltage pen. But I've noticed it reads AC. Am I buying the right one? As trucks run on DC??

[@jackass72]

Shouldn't matter. As far as I know, any of those battery-powered AC voltage detectors don't know the difference between AC (alternating current) voltage & "pulsed" DC (direct current), as long as the voltage is high enough for the detector to pick it up. Just used my Klein last week, that I got from Home Depot, to diagnose a 3516 CAT no-start condition and it sensed that the injectors where firing.

[@franciscovera828]

Harbor freight $3.99

[@MorlaiBangura-b3j]

This video is so Good

[@joeshreeman8640]

I've got a c10 crank no start. First thing I noticed is the engine light key on engine off will not come on. Can wire from pin 70 "no power" cause this?

[@bowhunter3125]

I have a motorhome with a cat c12, there is now fitting on my fuel filter, they are located outside the engine compartment.

[@rolandosalazar4360]

Thank you I had to put power to 52 53 leads and it work thank you

[@cruzflores6981]

Locally in PR we have not so many CAT TECH. But we have 3 CAT 3116 1997. now we have a Fuel pump transfer section problem. we exchange Sleeve and piston but still hard to start since we have no pressure on Fuel gallery. Please help with some suggestions.

[@aaronwarren8389]

By the way , thanks for the shop videos

[@08tundra]

Hey how are you? Thank you for all your informational videos they are great, I have 1995 twin Cat 3116 marine application, one of them when I shut it off and try to start it 5 min after shut off and warm up gives me trouble to start won’t crank right up. any ideas where to look

[@pandaspartandieselservicel8610]

Brother love your channel, I got a m2 freightliner with a c7 Caterpillar 2008, my truck was running and out of nowhere blew all oil out the transfer pump whip hole, the huei pump is about 2 years old, so I replaced the transfer pump, it ran good for about 2 hours then did it again blew oil out the transfer pump. Any thoughts?

[@jiml9971]

Would you please make a video on cam removal on c7 and or 3126 thank you

[@soulsurfer9908]

HEY. LOVE YOUR VIDEOS. ONE QUESTION, WHERE IS THE BEST PLACE TO BUY A NEW/REMAN HEUI PUMP FOR THE C7? ANY RECOMMENDATIONS?

[@albertomendez1290]

Can U please tell me what oil do you recommend for my C13? THERE ARE many opinions.

[@willywill5825]

Is there a way to check your atmospheric pressure switch ?

[@bucketsamson8314]

I dont have any experience working with HEUI systems. Does the HEUI pump actually fire the injectors? Im assuming the pressurized oil just sort of pressurizes the fuel and then the ecu fires the injectors if Im understanding right.

[@AdeptApe]

+Bucketsamson I've got a few videos that talk about the system in more depth, so if your interested check them out. You are mostly correct in that the ECM fires the injector and uses the high pressure oil to press the fuel in the injector.

[@ericuncapher9922]

Got a c7 no start. Code 55. Replaced pump cause no fuel pressure. Have pressure no stat. Got tach reading on dash. No volts at 2 pin plug on pump. Ecm?

[@JasonGut]

A long shot question, but my Isuzu 5.2 diesel 4hk1 won't start. Can I do a compression test by removing the glow plugs? Or does it have to be tested through the injectors?

[@sameuljones5496]

ApplianceGuyOnline you can do a compression test at either. I do mine thru the glowplugs on any Isuzu. Just make sure the pump is in the stop position as fuel will enter the bores sealing the rings otherwise giving a false reading

[@apaluakutu9202]

Thanks for the video. I have 2004 GMC C7500, The engine won't start after sitting down for 2 hours, but with quick start spray into the intake then the engine start. Also if I plug in the electricity power in the night and start the engine first thing in the morning it will start easily. My question is what do you think might be the cause of not starting after 2 hours of shutting the truck down?

[@mtgwdefender]

Hey guys! I have a C7 engine family 5CPXH0442HBK with the cylinder head off and the walls on cylinder #3 with some scratches, if not gouges. The original symptoms were huge blowby coming out and blue smoke / oil coming out of the tail pipe. What is weird is that cylinder and head area for cylinder #3 are dry and we found oil on top of the other cylinder / head area. Also, only cylinder #3 exhaust manifold hole is wet of oil and the other ones are dry. Please let me know what are the chances that this engine can be rebuilt, maybe by cutting the walls and putting bigger pistons. Or, what are the margens /specs / limit for cutting the walls. Thank you for your help

[@GilbertgerishonNgure]

I have a c 15 engine which produces smoke on breather pipe and oil after I did service changing of engine oil oil filter fuel filter and after some days the oil dropped to 1.9 bar what might be the problem

[@travisheather9790]

You are the real deal man!!!

[@FV-gn7ce]

Hey buddy I have a c13 engine I was driving and my fuel level was low. Then suddenly the truck started to lose power and started blowing white smoke out. I changed out the fuel filters now it won’t start. It starts with ether and idles great just doesn’t go past 1100 rpm so it has low power any advice? I also filled up the tanks to a quarter of a tank.