2003 GM Truck 6.6 Crank No Start No Codes

This duramax was brought in for a cranks no start condition. It's not making any high pressure fuel pressure. Starts and runs with propane. I believe its got a high pressure fuel pump problem. There's no fuel in the oil. Really need to check return fuel flow rates but I don't have the hardware. The truck has other issues as well.

[@robertmendoza9519]

its a good video but you should have stuck to no start fuel pressure problem diagnostics

[@djosbun]

Even in that condition it has some value. I’m sure the owner will agree for further diagnostic time.

[@kmtischer]

I really get a sense of satisfaction from keeping older vehicles on the road. However if your going to pay a shop to do the work, it might not be worth it. If you do your own work, to me its a nobrainer, fix her up. But thats just me. Really like your channel. Right up there with SMA, Pine Hollow, and Watch Wes Works. Keep making videos and I predict this channel will grow fast.

[@PhillipBailey]

I appreciate the feedback and you watching.

[@cody6.6max]

@@PhillipBailey P1093 and p1094 codes with rail pressure not matching at wot only . Thinking bad pump but replaced pump and now still getting no start unless I spray it , so I know it’s fuel related but hope it’s not injectors cuz I have no sign at all of bad injectors . Hope it’s just a bad pump out of box . What would yall think with the little data I gave ya . P1093-1094 rail pressure 8k and desired at 23 k at wot only , other than that pressure it’s spot on than trucks cuts of sitting there idling . Had to prime filter head to start it . Drove ten minutes cut off at red light . Had to prime the hell out of it even with fass lift pump got it running and dies 20 feet down the road and limped It home . Replaced cp3 . Got no start unless with spray , got the p0089 code and surge at idle but pressures were spot on while driving but now no crank still . Fuel leak at cp3 fittings and somewhere on back of housing . Sent it back , have another pump otw! Help me save some money for diagnostics trying to save money

[@PhillipBailey]

@cody6.6max there are several possibilities for those codes. Excessive return fuel flow from the injectors, pressure regulator, over pressure relief valve leaking and worn HP pump. You need to check return fuel flow rates from each head which is a huge PITA to do. As far as I know this truck was never fixed.

[@franciscoxaviergonzalezrom4648]

A lot of work to do! Nice video Sir!

[@spinb]

She's in rough shape. But I'll bet it's paid for!

[@3111windyhollow]

I rebuilt my 06 duramax, and I'm getting the air out of the fuel lines. No start yet. Remember, kids don't run a diesel out of fuel.

[@danman9017]

wonder if he is going do it,transmission will go soon ,cooler line leaking ,thanks for sharing

[@victorsidingguy4371]

My 2003 Duramax started very slowly and when hot it didn't want to start. There were 4 injectors. They didn't have the strength to start

[@jasonsweeten2851]

Did you ever figure out the problem on this truck? My truck is doing the exact same thing and I've replaced the whole fuel system (including the CP3) except the injectors

[@dombs2343]

Help me too

[@jasonsweeten2851]

@@dombs2343 ac Delco fuel filter fixed my truck I changed my filter several times as soon as I put an AC Delco filter in it my problem went away

[@dombs2343]

@@jasonsweeten2851 will give it a go when I dive back in, thanks!!

[@twostroke12v71]

Commenting on the video for the algorithm

[@cody6.6max]

P1093 and p1094 codes with rail pressure not matching at wot only . Thinking bad pump but replaced pump and now still getting no start unless I spray it , so I know it’s fuel related but hope it’s not injectors cuz I have no sign at all of bad injectors . Hope it’s just a bad pump out of box . What would yall think with the little data I gave ya . P1093-1094 rail pressure 8k and desired at 23 k at wot only , other than that pressure it’s spot on than trucks cuts of sitting there idling . Had to prime filter head to start it . Drove ten minutes cut off at red light . Had to prime the hell out of it even with fass lift pump got it running and dies 20 feet down the road and limped It home . Replaced cp3 . Got no start unless with spray , got the p0089 code and surge at idle but pressures were spot on while driving but now no crank still . Fuel leak at cp3 fittings and somewhere on back of housing . Sent it back , have another pump otw! Help me save some money for diagnostics trying to save money

[@cody6.6max]

@phillipbailey

[@PhillipBailey]

Sorry I just saw this. Sounds like injectors flowing too much return fuel. Need to measure return fuel flow rates.

[@gjeTV]

So let me get this right. I’m in a state with my 02 duramax that it starts cold. But once warm it won’t start. No smoke at the exhaust, no surging when started, loads of power When you step on it. After a good drive and it’s at OP Temp it decides to just crank with no start when hot, so I’m stumped. I was almost think fuel pressure relief because the primer on it stays very very hard and firm like it’s primed.

[@PhillipBailey]

You need to monitor injection pressure during the crank no start hot condition. Chances are you have an internal leak from one or more injectors and excess return fuel flow. Heat can agrivate the leak rate.

[@gjeTV]

@@PhillipBailey so what would fix this? O rings and washers?

[@PhillipBailey]

@gjeTV well you have to figure out if return fuel flow is excessive, if it is then you have to determine which bank the problem is on or if it's tge pressure regulator, over pressure relief or possibly injection pump. You need special tools to connect to various locations to measure return rates. It's very time consuming and usually results in replacing injectors on at least one bank. Given the age and the know problem with injectors if it comes down to that I would recommend them all. Search KZbin for testing procedures

[@gjeTV]

@@PhillipBailey so I’m looking into changing out the CP3, Injectors, FPR and The relief valve? 🤦🏻 oh boy

[@PhillipBailey]

@@gjeTV not all of them.

[@NC_Fisherman1]

Hey How are you doing my father has an 03 2500 Duramax that was parked one day, and but the next day it will crank, but no start and no shop around can figure out what's wrong with it is there anything that you can tell me that would help me diagnose it I appreciate it. Thank you.

[@PhillipBailey]

Have you tried scanning it for codes at least? Is there an RPM signal while cranking. Is it building fuel pressure. Did you try priming it?

[@NC_Fisherman1]

@@PhillipBailey yes all of those even replace the fuel pump there were the transmission codes but we put a new TCM in and it has great fuel pressure

[@PhillipBailey]

@NC_Fisherman1 what is the high pressure fuel pressure cranking, cranking RPM. Injector pulse width. Is the air inler restricted? Compression test possibly timing jumped.

[@NC_Fisherman1]

@@PhillipBailey P0748 Please check the wireless connection. (1) (2) Pressure Control Solenoid Electrical P0763 Shift Solenoid "C" Electrical P0768 Shift Solenoid "D" Electrical P0773 P0778 Lock-Up Solenoid Electrical PCS "B" Circuit - Electrical P0743 TCC Circuit Electrical Problem P0880

[@raygood7986]

i have a 2004 6.6 lb7 and this diag is helping me so much, have no communication with the ecu with a scan tool but it does crank up with no start... i would be soexcited if this thing finally cranked up and starts using this diag method.. i do have access to all data since i work at a toyota dealership but i have 10 days to diagnose this problem since we have to move our personal vehicles off the lot after 10 days, ill be posting my updated status here everyday for the next 10 days ... i would really appreciate it if you replied to me and any feedback would help so much ! i also say the other dirtymax diesel diag video lol so im gonna use some of that diag process as well.. if you have any tips on what i can use from alldata id appreciate, so as of now i tried connecting a code reader an it doesn't communicate so tomorrow im gonna check that ecu ground bolt and see if i can communicate with any other module as well as printing out the schematic . thank you so much !!!!

[@PhillipBailey]

Thanks for watching. Does the MIL turn on with the key? Check all fuses with a test light but also pull out the appropriate fuses to visually inspect the pins. If your in a salt area the fuse panels corrode. Using a wiring diagram load test the battery, ignition and grounds to the ECM. As you said do a network scan to see what controllers you can talk to. Does the tach jump up slightly when cranking?

[@raygood7986]

@@PhillipBailey here i am 2 days later and the truck finally started up yesterday purrs like a kitten ! i watched all your videos printed out the schematics and tracked down the ground for the ecu to start communicating ... im tracking wires down everywhere then out of no where there it was , a random ground wire just hanging there not connected to anything, i re grounded it got 5 guys to push the beast into the shop connect the batteries to supplied power and vroom that sucker started right up !!!!! im and beyond excited !!! i bought everyone drinks... this truck has 180k miles and its been to 5 different chevy shops almost 1000 towing it back an fourth just a disaster and thats all it ended up being ... sooooooo thankful for your page !!!! maybe if one of those techs had watched your videos they would've figured it out !!!! they could have charged me 20 hours of labor and i would have payed it

[@raygood7986]

Well here I am again, since I’ve driven the truck … it broke down on the road… low rail pressure .. had a cloud of smoke when it broke down and wouldn’t restart … so back to square 1 …. Actual fuel rail pressure is 75 psi and it doesn’t move… ripped it apart in the valley looking for fuel leaks .. changed the fpr and valve, no luck… then watched your other video and put a tank of fuel directly into the 1/2 and 3/8 inlet lines.. rebuilt the filter housing no luck .. now I’m depressed I’ve been at it for a week .. no direct info out there … how do I know if it’s actually the cp3 pump that’s bad or if there’s air in the line .. any advice ?

[@PhillipBailey]

Since there is no lift pump supplying fuel to the CP3 pump I'd make sure it's not sucking air between the filter outlet and the high pressure pump. Check for leaks on the banjo bolts on the injection control module. You say you have connected an alternate fuel source to the supply and return lines at the left rear of the engine and primed it. 75 psi is really low. Will it run on propane? Don't use starting fluid. If the fuel supply to the CP3 checks ok the next step is to measure return fuel flow from both banks return circuit. That is a pita and requires service fittings.

[@raygood7986]

@@PhillipBailey okay ill report back, ill buy new outlet line between filter and cp3... i have alternate fuel to the line inlet and outlet on the passenger side by the brake booster.. should i try putting the fuel directly into the inlet on the filter housing ? i haven't tried propane yet, should i try that now also? ..... when i removal the line that supplies the cp3 i can see fuel available in that line so im just not sure how to check if the cp3 is receiving that fuel etc.... is there a business phone number i can call you from maybe i can pay your service fee ? i really need this truck running and it was running perfect so i know its definitely a fuel problem.. it has no codes I've fixed all the other little things electronically etc .

[@coreyfarris546]

Hey phillip ive got a question about my LB7 and you seem very smart and know what your doing. so my truck whenever i step on the gas and romp on it about 2-3 mins later the truck just dies and pops a code for a crankshaft sensor but ive since replaced that and its still doing it. any idea? injectors were just done about 20k miles ago

[@PhillipBailey]

What is the actual code it's setting? What brand of sensor did you use.

[@cody6.6max]

Please tell me it was the pump cuz mine did the same . Bought a reman piece of shit pump and it’s leaking out the box and getting p0089 code for bad FPR . Sent it back and getting another in three days so we’ll see . Oh yes 250,000 miles , fass pump , tuned , dsp5 switch . Hard start still with that pump with the p0089 . Other than leaking and that it still managed to keep Up with pressure just not at idle of coming to a stop at red light or stop sign type of deal

[@yllkras7787]

Hey Phillip, I have a similar issue with the same LLY 6.6 engine in my C4500. The truck cranks but doesn't start, and there are no error codes. However, if I start the truck using propane or ether, it runs fine. I assume there are no fuel leaks because the truck runs great once started. I've already installed a new OEM filter and primed it extensively, but I'm still experiencing the same problem. Do you have any ideas on what might be causing this?

[@PhillipBailey]

You likely have excessive return fuel flow most likely due to internal fuel leaks in one or more injectors. At cranking speeds the volume from the injection pump is too low to overcome the leaks.

[@yllkras7787]

@@PhillipBailey So i took the return line off before it enters the tank and only while cranking the return line leaks all the fule back to the tank, but if the injectors are leaking why does the truck run good when it is started with ether? im thinking its the fule relife valve at the end of the driver side fule rail....

[@yllkras7787]

also Phillip my truck will start right up if i crank back the truck with in 5 seconds after truck was turned off but if i try to start truck after the 5 seconds of it not running it will only crank so I think its just sending my flue back but when i try to block off the return line and try to start the truck the return line gets way to much return fule pressure, to the point where my hand cant hold so im wondering if my relive vale is doing it or something else ?

[@PhillipBailey]

@yllkras7787 as I said before it could be one or more injectors returning excessive fuel, the pressure relief valve leaking, pressure regulator leaking, or a weak high pressure pump. Fuel pressure is related to flow versus restriction. At cranking speeds the volume of fuel is low resulting in low pressure as most leaks back to the tank. There is a spec for maximum return fuel volume for the entire system measured at cranking rpm for a specific length of time and no more than 100ml. Here is a good video; kzbin.info/www/bejne/p3SYpJmVd7abq5I

[@yllkras7787]

@@PhillipBailey Thanks for the info I ended up just finding a collapsed metal fuel line thats leaking on my truck that is on the return side of the line seems like this was causing the loos of psi I didn't even see the leak while the truck was running i ended up finding the leak while trying to take the pressure relief valve off The leak was right behind the cp3 in the valley of the 6.6 so i didn't every see a leak from out side

[@SULLIEDASP]

Mine is the sending unit fuel pump was replaced but didn't fix it

[@PhillipBailey]

What fuel pump? Tell me you didn't change the CP3 pump?

[@cody6.6max]

???

[@cody6.6max]

@@PhillipBailey what fixed it ?? We’re here years later with same problem

[@John-Adams-Can]

If this was a dodge I would say it's instrument cluster issues or battery low confusing computers.

[@dennisgolden6733]

What would cause crank no start after installing a 07 24 valve into an 03?