TROUBLESHOOTING THE P0087 CODE

[@cholochedd6752]

Love how the guy in grey was about to go into detail and was exactly what I wanted to hear the the guy in the black just rudely interupted him cut him off my gosh this could've helped alot of people out smh

[@MarcM143]

Lol my thoughts exactly

[@HighMileageHelper]

Exactly! He interrupted him so many times when he was about to dive deeper! Lol really?

[@Bonnievr8521]

I recently diagnosed this exact code on a 2006 LLY that would only set code under heavy load after driving for approximately 50-70 miles. Once the code set and engine derated the code would set frequently and even stalled one time. After extensive digging I found the plastic portion on the filter housing that houses two o-rings and seals to the filter housing via an o-ring on the bottom had a very very tiny crack in it causing air to enter system. Hope this helps someone in the future and can save some brain damage.

[@evansizemore296]

Just got off the phone with Bob. Great guy he told me with the problem u was having that it was on the low pressure side of the fuel system so I know where to start looking at now.

[@chrisao1987]

What issue/symptoms were you having?

[@thadleroy6271]

08 has electric pump added and goes into limp mode under hard throttle 0087 code

[@Carlitosway211]

Appreciate y'all's videos! Next step is testing vacuum on this guy's truck. He bought that plug and put it in himself but it's still throwing a P0087. He has it turned up with a tune, and 5" pipe all the way back. 165k on the ODO. Think I'm going to replace the lines at the filter housing just due to mileage. Kinda like radiator hoses ya know.

[@crasher88]

You say command the cp3 pump to out put max pesrrue with a scan tool. My question is what should max out put be on this test?

[@stevewaclo167]

Another common injector failure in LB7’s is deterioration of the ball/seat in the internal return circuit. If those items are badly worn, high return rates result with long crank times (because the CP3 cannot establish minimum rail pressure to wake up the FICM) or no start. Checking return rates on each bank can be fussy, but a relatively quick test can be performed by opening the return line at the tank and checking for 100ml (I believe) or less after 15 seconds of cranking. Pull Fuse 1 (double check that) to disable the FICM first. Again, this won’t ID which bank, but is a good go-no go test and you will probably want to change out all injectors anyway. Search KZbin for good videos on the details of this test. Other suggestions welcome.

[@megastick9324]

the newest iteration injectors have hardened seats...that what I put in when mine needed it...

[@gerardhoward3084]

Awesome video. I just had my 2009 Silverido 2500HD Duramax with 185000 throw the same code towing uphill in 100 degree temperature. In 9 years its had this problem twice before. Same scenario but a lot less miles. I always change out fuel filter when it hits 50%

[@milwaukeebiker]

Looking for a straight answer on what the KEY ON ENGINE OFF (not running) Fuel Pressure Sensor reading is supposed to be (on a real scan tool) for and LBZ and LMM when the sensor is working correctly. Is it Zero (0.0 Psi)? Or is it supposed to read something?

[@johnniemo]

Most of the videos I watch says to test the injectors. Okay sure, but then what? Can they be rebuilt? Or are we just replacing them anyways? I'm familiar with gas injectors, where they can be cleaned and re-used. Not sure if diesel is the same.

[@saltysteel3996]

My 08 LMM is fully deleted and EFI Live tuned. On tune 5 it starts out at 26K psi and starts bleeding down while under full throttle until it reaches 15k psi. I have ported fuel rail fittings and the fuel rail pressure relief valve delete plug. No leaks anywhere. Local diesel shop hasn't tested the truck yet but they think it's a bad regulator on the CP3. I do have the BMP lift pump kit with a CAT filter. Also, fuel lines look to be ok and my injector balance rates are perfect. No hazing, no rough idle, truck runs fine, but losses pressure under full throttle launches or passing traffic scenarios. My tuner and shop doesn't think the CP3 is bad. I'm currently at a loss for now. Can the fuel rail pressure sensor leak? Sometimes I get the "change filter" message and I've had the truck go into "reduced power mode" once and I cleared it out. Thinking about just replacing all the factory fuel lines and regulator on the CP3 and going from there. Anyone had this issue?

[@Duramaxtuner]

Why don't they think the CP3 is bad? FPR should not slowly bleed off and if you are delivering 15K while commanding 26K psi, that is a big difference. Usually a bad regulator will show itself by loping at idle, not bleeding power. When the regulator is unplugged (no power to it) your CP3 will run at WOT.

[@kaemanarbuckle7251]

I only get the P0087 code when hauling big loads on cruise, if you drive with your foot it never comes on....but the minute you turn cruise on and it starts pulling up a hill I'll get the code and truck will go into limp mode ?? I know your not supposed to use cruise when hauling but I do lol I have an 06 3500 with 472,000km on it. Injectors were done at 300,000km

[@tahirforever6926]

How did you fix that ? I have hino 2010 box truck and same problem with it

[@christopherolson8757]

I bought my lb7 with this code and it was my first diesel. I got an air dog, fprv and a fpr, my cp3 and injectors are fine and I totally forgot about the fuel filter and if that fixes the problem I’m gonna hate myself 😂

[@lv9322]

Lmfao, well did it?!?!

[@christopherolson8757]

@@lv9322 nope. I got a new fuel filter and nothing changed then I decided to completely bypassed the factory fuel filter, did fix the problem but put some pep in its step. Thinking it’s the cp3

[@lastfirst5790]

Tried a vac gauge in the test port. Taking it for a drive it quickly/steadily climbs to about 25 and stays there. Even after letting it idle in park for a bit. Just stays around 25. This is after replacing 2 seemingly kinked fuel lines. Clogged fuel pickup? Fuel filter fresh and always changed religiously.

[@Duramaxtuner]

Are you sure it is a low side issue?

[@lastfirst5790]

@@Duramaxtuner thats what im trying to troubleshoot? Relief valve wore out?

[@kimberlymilan9857]

ok, so we have 2009 3500 chevy silverado duramax 6.6L. started off thinking it was fuel line changed all the lines new new filter. it all started hauling heavy load then light comes on and says the truck is reduce engine power in limp mode. pull off road for a few than it will run good like its a new truck. hit large holes on road then it does it again. the last time we had it on scan showed the p0087 but we thought we fixed the issue ran fine we get loaded and it back to doing the exact same thing as before powers down. this is crazy and I am hoping you all could pretty please give some advise. Thank You for your hospitality.

[@mshaz4801]

Same exact shit on my ram3500

[@Franklinveterinarycenter1of4]

what did you find out?

[@zackk695]

I have an LLY with 8,000 on the motor. No mods except a RDS 64mm turbo. New engine throughout. My issue is that the fuel rail pressure is all over the place and sounds like a blown engine. It started 2 months ago and sounded like an injector knock but got much better when running above 180 degrees. Now it does this all the time. 3 shops have had it and no answers. I don’t recall it even throwing a code at all. Engine still running horrible and can’t drive it. Any advise would be great

[@jimsmith4590]

Best way to diagnosis between pump and injectors is return rate testing.

[@MiltierJeremy]

Well I think I figured it out my factory filter housing has a tiny leak. What's the best way to bypass the factory fuel filter

[@ronobrien7187]

I have had this code (3) times in my 2006. Changed the fuel filter. All good.

[@brianspangler3982]

Question. On a 06 200K miles. Could it be a soft or weakened rubber fuel hose near the transmission collapsing under pressure? Mine does it pulling a load on a long incline. Shut it off for two minutes runs fine again. Already replaced the plug with one of your replacements. Thanks for your help.

[@guruprasath7368]

Sir iam from india i own mk5 jetta tdi 2.0 my car has small jerk while starting and the car is flashing its glow plug when i drive in slow speed if i rev the car nicely and drive there is no issue with it i dont what causes this issue and i get the code P00870 i changed my entier CR system but no result could you please help me sir

[@740turbobrick]

For what worit's worth, my LBZ had a big tune and no lift pump when I got it. Any prolonged WOT runs led to a dramatic drop in rail pressure and P0087. I installed a lift pump and the truck now holds 26k rail pressure and has tons of power. Moral of the story, lift pump should be the first thing you do to a Duramax

[@michaelsmithwick1582]

My lmm has thrown this code everytime I have gotten on it when jumping on the highway (2 times) since I bought the truck

[@juanvasquez8446]

@@michaelsmithwick1582 Mine too...we need lift pumps asap bud. Keep our cp3's alive

[@mickball4329]

740turbobrick Thank you so much. My LBZ does the exact same thing with the PPE on the truck and I was worried my CP3 was dying on me. Time to go get a Fass

[@josegm4010]

a question I have a 2008 Lexus is250 car the code that marks is p0087 says the mechanic that is the valve pressure that the engine needs.

[@Handlehandlebars]

I'm a little confused...I thought if it was not able to achieve correct pressure at idle it leans towards the injectors...and if it happen up grades under loads it's a malfunctioning cp3 pump acting up...

[@jasonwilcoxen9739]

duramax tuner..... I have a 2006 lbz with 250k has 3 stage tuner fass lift, e were driving down the highway today no load running approx 80mph popped up p0087.... have all new filters and fuel plug ordered.... anything else should be checking?

[@BEAMERNOOB]

Would intermittent low rail code along with fuel pressure regulator performance codes point towards the regulator itself instead of the cp3?

[@guruprasath7368]

Did u solve this issue

[@rustymyers6508]

What is the p0089 code on a 2001 lb7 dmax?

[@zachstaysclashin6642]

Hello, we have a 2007 LBZ Duramax. We have changed everything you said except for the fuel pump. My question is, how is the truck black smoking if the truck is not getting enough fuel? Thank you!

[@nicholas3945]

Poor spray pattern making it not burn completely

[@josephharms50]

LB7 2004 P1093, What do I need to look for and how to diagnose. Fuel pressure relief valve is good, did the bottle test and no air bubbles. New fuel rubber hoes and new fuel filter

[@michaelsacy5849]

Joseph Harms where is the relief valve on a lb7.

[@michaelstjohn6086]

@@michaelsacy5849 good question...

[@dl8468]

In valley under turbo intake

[@flintbarnes9291]

Hey guys! I have a 2009 Chevy 3500 duramax 4x4 thats throwing the P0087 and telling me to change my fuel filter (Something ive done twice, last time being 3 days ago). Anyhow i have a Mini maxx programmer that i keep on mild tune. I get the code either when i get on the accelerator pretty hard of if i hit a good hill. My main question is what scan tool can i buy on the cheap that would allow me to narrow my search down? i have a baby on the way so money is tight but thus truck is what i use for work (pipeline welder) so i cant shut down and let a professional look at it. Any help would be hugely appreciated. thanks!

[@Snoscoot]

Flint Barnes what ended up being your issue. I can’t figure out if I’ve got an injector or pump issue

[@ozzyvanhalenrox]

I used to get that in my 08. I put a lift pump on it and haven't had the issue until recently on a road trip towing. Im going to install the pressure relief valve plug next

[@charlesrowe6956]

2014 ecodiesel. I get P0087 at around 2200 rpm. No hesitation in the throttle. Truck runs fine. Recently had fuel system flushed by dealer. Did not get code until after they flushed it. New fuel filter. Please help. Were is the test port on the Ecodiesel? FRP_A_CMD 16,870 (psi) and FRP_A 13,008 PSI at time of error.

[@Duramaxtuner]

I'd recommend returning to the dealer since the problem cropped up after they worked on it. The code triggers if there are even a few hundred pounds of lost pressure. If you would like, please give us a call at we can walk you through some basic troubleshooting: 815-568-7920.

[@nunomontes2922]

I was getting a 0087 code and reduce power turns out it was bad thermostats that wouldn’t let the truck self regen

[@theandrewmoorepage8199]

What thermostat?

[@derikovermann138]

04.5 lly get a fuel knock on right side of engine from 1300 to 1500 rpms and then it smooths out also when i start the truck i get a slight rpm drop before it smooths out i was thinking fpr any advice?

[@Duramaxtuner]

+Derik Overmann I would check the balance rates on your injectors to make sure they are within 4. You are able to do this with an AutoCal or SPADE unit. Give us a call and we can tell you more. Thanks for watching!

[@evansizemore296]

I have a question for you. I work in a diesel garage work but we work more on heavy equipment and are not specialized in any one type of motor. I have a 2003 duramax lb7. I bought this truck back in may and for the past few months I have been having an issue with it not starting. It is throwing no codes and has 132000 miles on it. The truck does not haze or smoke any at idle. The part that messes with this is that if you change the fuel filter it will start fine for a few days and slowly start taking longer to start until it wont start at all. We hooked a tech2 up to it and if we understood how the balance rates where to read after you adjusted for the fuel pressure rate then six of the injectors are bad, but if we didn't need to adjust the balance rates for the fuel pressure rate then only 1 injector was getting close to being bad. I have a hard time with this because the truck as never lost any power and still drives great. There is non fuel leaks to be found anywhere on the truck and there is no fuel in the oil either. Last thing to throw a monkey wrench in this is that when i change the fuel filter is it always half empty never full of fuel. Any insight on what the problem could be?

[@Duramaxtuner]

Evan Sizemore: Thanks for the question. You've got a lot going on in this message, I think it would be a good idea to call us and talk to one of our techs. I'm sure we can help dig into these issues a little deeper. Give us a call and ask for Paul, Bob, James or Chris. 815-568-7920.

[@dankbobby]

Evan Sizemore My guess would be your fuel filter head needs a rebuild, cheap and easy to do. Also a lift pump would help with an older truck. good luck

[@evansizemore296]

dankbobby It had cranked injectors. Figured it out when I smelled the fuel in the oil. Lift pump will be the next thing to put on the truck. I had also done the fuel filter head rebuild didn't help but didn't hurt either.

[@evansizemore296]

Tracey Oneal​ Hey Tracey if you don't a pretty good knowledge of motors I would say not to do it. I want to think that on your LLY that the injectors got moved out of the heads. My LB7 had the injectors in top of the heads and it made it a really big job. Check your oil level. If it is over full or smells like diesel it probably has a bad injector. They are pricey to replace and don't do just one. If one or two are bad the rest are likely to follow. Bite the bullet and have them all replaced. Cost me 4000 have them all replaced. How this helps you some.

[@JDHitchman]

+Evan Sizemore You probably need to rebuild or replace the fuel filter head/primer. The fuel filter head will start to suck air as the internal O-rings age and wear. A half full fuel filter is a sure indication that yours is sucking air and loosing prime. There are tons of merchants that sell fuel filter head rebuild kits.

[@AliHamza-ls8xm]

How about when i turned the ignition on the FRP was 2830 kpa and after starting the car it goes down to 250- 220 kpa? I hve 2016 accord 4cyl

[@JJFlores81]

I get the p0087 code with the truck just being at idle. I have changed the fuel filter and still get the code. The truck is a new 2015 with a duramaxtuner tune and full delete.

[@michaelstjohn6086]

What did you do to fix it?

[@paulkerpash3668]

I have an 06 with 244,000 (original owner) on the clock it only throws the P0087 code when towing heavier trailers/camper uphill. No issues with the truck other than that. I'm thinking of trying the Fuel Rail Pressure Relief Valve Plug to see if that cures it. If not injector removal for testing. Your thoughts? I have a Bullydog GT Tuner on the truck only for the mileage improvement it provided. I've been told a 100GPH lift pump would solve the problem also. I have rebuilt the filter head gaskets and plan to do the cat filter adapter soon.

[@Duramaxtuner]

Can you give us a call Monday? Sounds like you're on the right track with your troubleshooting, but our techs may have some other ideas for you to consider. That mileage is amazing - no doubt you've done a great job with your maintenance routine. Here's our number: 815-568-7920

[@paulkerpash3668]

Still getting the 0087 code with the plug replaced and towing a load.. Lift pump next, trying to decide between the 100 and 150 gph Raptor.

[@paulkerpash3668]

Put a Raptor 150gph lift pump on, haven't towed anything yet, plan to shortly to see if it is solved for now. If not, injectors and pump next. Did a PCV reroute while I was at it too.

[@michaelstjohn6086]

@@paulkerpash3668 fix it?

[@perryhanson7878]

What is considered high milage, my truck started this at 65,000 miles so did my sons and my nephew all three 2006 lbz that was pulling our campers up steep hills on the interstate we change fuel filters ever other oil change with oem or cat filters we have lift pumps and changed the fuel rail valve ,you'd think injectors would last longer than 65 000

[@Franklinveterinarycenter1of4]

what did you find out?

[@freddiealvarez6707]

Any help out there? I have a 2001 duramax! losses power when towing // in boost

[@JeffRoberts-p4l]

Plan on pulling the LH fuel rail! Tried for hours to get the factory valve out without success. Their website says 30 minute job... pure bullshit unless the engine is out or cab off maybe...

[@Duramaxtuner]

Thanks for the note.

[@cgarza789]

I have a 2006 lly that gave me this code I have the spade tuner with the dsp5 switch and a edge insight cts. the truck has a egr delete, 5 inch straight pipe exhaust, Banks ram air intake, a fass lift pump and ,35x12.5 tires. My biggest concern is the amount of smoke that comes from the exhaust could this be a symptom from that code?

[@Franklinveterinarycenter1of4]

what did u find out......turbo?

[@joshuabistline9564]

My lbz has thrown this code twice now (about two months between) both times when it was at 210 degrees. It also rolls a lot more coal when it’s at 210, any ideas?

[@Duramaxtuner]

Failing CP3 or injectors, or your stock fuel pressure relief valve opening. You will want a scan tool that allows you to see desired and actual rail pressure. This will help point you in the right direction.

[@quintonbaker5056]

What if I’m only getting around 4 psi of boost and it’s sluggish the whole time I’m driving and smoking like an old 12 valve?

[@Duramaxtuner]

Check for a big boost leak! Run a DTC scan.

[@MarcM143]

What if it's a cp4 pump and it's on a Powerstroke 6.7 and no check engine light but just the warning "Fuel Low Pressure"

[@Duramaxtuner]

Does it happen when you are at WOT or running it hard?

[@MarcM143]

@@Duramaxtuner Not sure it's so intermittent. It says Low Fuel Pressure about 2x per day now. I changed the fuel filters and still happening. I've seen one KZbin video that says there could be a buildup of sediment from the diesel tank clogging a fuel line port at the top of the tank mounted fuel filter housing. Doesn't seem to be losing power and no check engine lights tho

[@stephengeorge1683]

What if you get this code and the truck dies when decelerating from highway speeds? 08 duramax with an air dog lift pump

[@Duramaxtuner]

It could be a lot of things. I would start with checking if there is any fuel in the oil. If not, follow the steps in the video and it should point you in the right direction.

[@abderrahimserray2636]

Hello I have a same code 0087 in hyundai i20 2012 is it the probleme of turbocompressor ??

[@caseybazor]

Hi fellas I have a 05 lly that that threw this code. It happens if I let the truck idle for 10 to 15 minutes when cold to warm up. When it does it it idles fine but when I push the throttle it won't even idle up will barely move under its own power and sounds bad every now and then the truck will idle up a bit but doesn't lope. I can turn it off and restart and all is good. I replaced the fpr before this problem since the problem I've rebuilt the filter head, head hoses, filter, ice pick trick and x66p injector cleaner. If I just get in it start it and drive it's fine never lost prime and no long starts. I've been all through the forums and talked to mechanics with no results. Any help would be greatly appreciated

[@Franklinveterinarycenter1of4]

was it the pump?

[@oisess]

I bought a used lbz 309k miles. I stomped on it once. After a month of having it. Then i got the light to turn on. I had a racing plug already once i got the truck. I didnt know so i went to replace it. Now knowing it was a race plug already in there. I changed my fuel filter.

[@oisess]

Im in the process of buying a pressure sensor. And also regulator. The pump cost a lot. Should i tell my mechanic to just masx the pressure at idle? I dont have any surges on idle at all. I had the light reseted and it came back on a After sending it again after 3 days of being reset. If it was the pump wouldn’t it trow out the code just by regular driving

[@mikefuentes2601]

Wherebyall located at

[@AbelGarcia-ll5xt]

Am new to diesel truck I bought a LMM 2007.5 Had EGR DELETED AND TUNING few days after driving it trows p0087 code Will the work done recently has something to do with this problem?

[@Duramaxtuner]

Likely the truck had a weak fuel system to start and now with the tune asking for more it’s unable to keep up. -Nick

[@darrinkrahmer7166]

NEED HELP I HAVE FUEL IN MY VACOUM TEST PORT NEW RETURN LINES ALSO A HIGH PRESSURE PUMP NEW VALVE LIMITER AT THIS POINT IDK WHAT TO DO THERES NO LIFT PUMP 03 CHEVY 2500 HD TURBO DESIEL 6.6 THERES NO LIFT PUMP BUT I ADDED ONE IM NOT SURE WHERE TO GO NEED ANOTHER OPONION I HAVE NO FUEK LEAKS MY MAIN PROBLEM IS I HAVE FUEK IN MY VACOUM TEST PORT SOMEONE PLEASE HELP

[@CaliMonster]

Hi im from the uk and drive a seat leon 1.6 tdi with this same god and same problem...we have changed the fuel rail sensor today and going to change the fuel filter 2morrow if that doesnt work is my car basically scrap? 😫

[@Kokokasakero]

Did fixtures yours if so how pls

[@d-railed3917]

Is there a place I can buy the vacuum gauge for this I have a normal vacuum gauge butt it doesn't have a hookup for this system could I make a hookup

[@dl8468]

Take line off back of factory port plug into your gauge

[@nikki_chula83]

So on my 08 duramax will a sensor make u have the code p0087?

[@Duramaxtuner]

It would throw that code on an LMM, yes.

[@glyshorts9107]

So a 2002 duramax doesnt have a fuel pressure relief valve?

[@Duramaxtuner]

Not on the common rail.

[@jairoradilla1512]

My 08 sierra did this today while towing a bobcat roughly 10000 pounds going up hill reduced engine power came on hi-way that's the 2nd time this has happened and can't seem to find a fix

[@Duramaxtuner]

Can you give us a call Monday morning? We need to ask a few questions and maybe we can help you pin down the problem. 815-568-7920.

[@oliverknapp3104]

When is a good time for me to call you guys I have a p0087 on my 2008 lmm which is deleted and has the dsp5 switch for tuning the reason I ask is because it isn't causing driveability problems

[@Duramaxtuner]

Call us this morning (Monday) @ 9:00 AM Central - 815-568-7920

[@bearbarnard750]

I have a 07 with lift pump and dual fueler and got a p0088,,,, any ideas

[@Duramaxtuner]

with a High rail pressure code we always go and check our wiring to the Cp3s.

[@ethanfaul5865]

I need y’all help I have a 2006 duramax lly I was pulling my camper for about 15 min and the p0087 code came on .. I changed the filter twice and the code is still on please help

[@Duramaxtuner]

It would be a good idea to start diagnostics on your Cp3. Have you already installed a Race Plug?

[@ethanfaul5865]

I’m pretty sure I figured it out but not sure because it happened when I was pulling my camper ..I had the filter changed and the code clear and is running fine now I guest well see what happens when I pull my camper again thank for the advise

[@socaljeepshootersoffroad2818]

Did you fix your problem, having the same issue

[@megastick9324]

Chevy Garage quoted 75k for injectors...I spent 2500 on a complete kit with the latest iteration of new bosch for lb7...did it over 2 days....5k labor??!!

[@saltysteeze8136]

Can you give us a troubleshooting guide for p0087 lb7 engine , r/r fpr still getting code

[@saltysteeze8136]

I meant fuel pressure regulator on the cp3

[@saltysteeze8136]

And I meant p0089

[@shadg007]

2007 lmm 234k miles. I get 0087 only when pulling 28' trailer.

[@Duramaxtuner]

kzbin.info/www/bejne/rqOlopynq56EkMk Check out this video

[@abdulwahabawan78]

same code is indecate in my honda civic 1.5 $o what i chek 1st fuel real or hipresher pump

[@guadalupealvarez6785]

My 2013 duramax will not accelerate past 2000 rpm it just becomes gutless like starved for fuel could thaT be my problem

[@Franklinveterinarycenter1of4]

what did you find out?

[@bouchee2007]

whats the danger of plugging the fuel rail on a truck with a 100hp tune?

[@Duramaxtuner]

No risk, no problems.

[@leitch100]

I started ts'ing my p0087, and I started with my fuel filter, I had somehow double o-ringed it...easy fix. 🤯

[@bradybatson7625]

My truck is throwing this a p0087 code and my truck won’t run (2006 Lbz) I have a new Cp3 and injectors but cp3 is good. What could this be

[@Duramaxtuner]

@bradybatson7625 Do you have a lift pump on the truck? If not you could be sucking up air. Also if you do, it could be the source of your problems. Otherwise ther'es not much left. Maybe a filter or fuel line could be clogged but there's not much else too the system than that.

[@bradybatson7625]

@@Duramaxtuner It has a new filter and the fuel filter unit itself is new

[@bradybatson7625]

@@Duramaxtuner The previous owner thought that it might be the sending unit but i haven’t read anything about that

[@Duramaxtuner]

@@bradybatson7625 The sending unit could have picked something up, causing a restriction that would trigger this code. Although I would suspect that if you have an aftermarket lift pump and filter unit then that could likely be the issue.

[@MiltierJeremy]

Okay been trying to diagnose my LML okay, cp4 went out, replaced with new cp4, cleaned lines and replaced rails and all steps for cleaning up the mess that a shelled cp4 leaves, added a fass 150 get it all back together and still have low rail pressure at WOT. ?? What next? Relief valve?? Any suggestions

[@Duramaxtuner]

+Jeremy Miltier Can you give us a call tomorrow? 815-568-7920. The fuel pressure relief valve isn't that expensive and may be a good idea. But there may be other stuff to consider, so give us a call.

[@bibliography2035]

pull your injector return line off the top of all your injectors and you will probably have one or two returning way too much the spec is like 2 or 3 cc per second. if you have anything more than a trickle trying to start it replace that sucker

[@andyvandusen466]

I have a 2019 6.6 duramax in last year I've had 5 injectors replaced 2 times injector 3 and they went within 6 months of each other then number 3 went first time injector mechanical second time was electrical failure 3 months later number 7 they replaced both harness and injector I maintain truck every month at gm dealership oil filters all I do 25000 to 30000 km a month and can't keep injectors in this truck what gives???

[@Franklinveterinarycenter1of4]

what did you find out?

[@crazyhass84]

Man these guys have no chemistry. Nick acts like he is a annoyed by his employee lol. They need to watch some more top gear.

[@Duramaxtuner]

Thanks for the critique. I'll pass it along.

[@davidbenjamin9509]

Seems fine

[@sheraz.devsarfriendsdevsar]

I have 2016model swift disel i have a problem P0087

[@elgsquilliam]

Dude in black is a bit rude to the dude in grey

[@nandor690]

hey lets just change parts!!!!! and never even look at the sensor

[@coltoncarpenter3790]

They completely skipped the pressure regulator sensor.

[@harrison2281]

@@coltoncarpenter3790 please tell me about this sensor. I've tested a lot and I'm down to cp3 or injectors I think. I have not checked the reg nor do I know how

[@sokodad]

Mine on a hard pull up a hill with my 5th wheel camper behind against a 20mph wind kicked up the code. It's got 212k on it so betting injectors. Before shop does them though I'll have pump checked.

[@Duramaxtuner]

That sounds like a good plan.

[@Duramaxtuner]

Does your set-up include a lift-pump?

[@sokodad]

Local diesel mechanic said a lift pump is just a band aid for bad injectors or pump on a stock pickup. My buddy has one on his Duramax but he has programmer, exhaust, and methanol injection.

[@Duramaxtuner]

The lift pump only benefits the fuel pump, which then feeds the fuel rail and then the injectors. If you have a problem with the fuel pump and/or injectors, not sure how the lift pump will mask or correct for that problem. In our experience, bad pumps and injectors are just that - regardless of whether the owner has a lift pump. We recommend the lift pump as the first modification for diesel owners. But in your case, it may not have any benefits if you have a problem on the fuel system's high-pressure side.

[@sokodad]

It has low fuel rail pressure but after he clears code it has 26000 psi on all injectors. We changed pressure relief valve and now we're going to check fuel lines for possible signs of collapse when it's under load. Mechanic is ruling out small items first.

[@d-railed3917]

What is the max rail pressure at idle for a 2008 lmm

[@Duramaxtuner]

26,0000 psi

[@d-railed3917]

Duramaxtuner Thanks for responding. I run mine up to 150Kpa and it started to cut out. My truck runs fine otherwise. So this is a sign that my pump is going bad?

[@Duramaxtuner]

Hard to say - can you give us a call today and ask one of our techs? I'm sure there are other questions they'll need to ask to pin down what's going on. 815-568-7920

[@stlaww77]

Dude....what about LML?🤷‍♀️

[@ncortez251]

Thanks good information

[@jesustrevizo3148]

Nick and Bob do a full "how" to videos

[@impactshooting728]

I forgot to do my filter 4K over 🤦🏻‍♂️🤦🏻‍♂️

[@emorycoker9302]

I see all these KZbin dealing with trucks but I have a van 2006 that has an electric lift pump with the P0087 code

[@Duramaxtuner]

Is it a Duramax engine?

[@emorycoker9302]

@Duramaxtuner 2006 gmc savanna van 3500 duramax 3720000 miles started afterI replace fuel rail sensor because of to much pressure, 29000 psi switch on, engine off or running

[@emorycoker9302]

The fuel rail sensor corrected the high fuel rail pressure, few days later started getting the p0087. Replace filter, checked pressure screen in tank, low pressure to pump has closed to 14 psi

[@GarrettRC5thscaler]

*so they just happen to have a spare l5p laying around*

[@Duramaxtuner]

We do now - but not back when this video was produced.

[@jopay8697]

repair injector sir

[@AAl-xe5ef]

Sorry , but thats just throwing parts at it. Diagnose and test each parts prior to replace, At least thats what I learned.

[@koryholt4807]

I’m jefff

[@hhazelhoff1363]

Good information, but the guy with the cap has no personality lol

[@Duramaxtuner]

@hhazelhoff1363 We'll let him know you said that!

[@700Junky]

Got a LBZ 180K miles. I get a 0087 only after it gets heated up (fuel temp over 180*), under load in 5th gear. I drop into 4th and never get a code and I can maintain higher RPM TOWING MY 5th wheel up grades. If I leave it in 5th, I better go to the clear code screen on my edge CTS2 cause it’ll limp every time. I’ve been told there was a TSB that said replace fuel lines. They supposedly collapse under load. Can this happen even if I’m running a lift pump?

[@ozzyvanhalenrox]

shouldnt happen with a lift pump. without a lift pump they can collapse from the vacuum in the line, but with a lift pump adding pressure they shouldn't collapse.

[@JasonY02]

I put a fleece pump on mine and I have a p0088 code high rail pressure??

[@Duramaxtuner]

If you need assistance, give us a call 815-568-7920.