The Diesel Garage banner

Status
Not open for further replies.
1 - 15 of 15 Posts

·
Registered
Joined
·
30 Posts
Discussion Starter #1
getting a code p0087 and poo87 pd on my 06 lbz with t dog outlook and banks cat bak exhaust allison tranny truck goes into limp mode fresh fuel and air filter cant read code from outlook only from plug in code reader only get code in extreme mode or performance stock mode and tow mode ok do you guys think ive got a weak fuel pump and if so whats the best aftermarket setup i really dont want to take it to the dealer didnt see this code listed in the code list but code reader says low fuel pressure thanks for any help
 

·
Registered
Joined
·
30 Posts
Discussion Starter #3
happens in extreme mode or performance mode under full throttle engine lags then throws code does not seem to do in stock mode power is definitley off right before it throws the code
 

·
BUG JUICER and
Joined
·
1,239 Posts
You may be suffering the wrath of the fuel bypass valve. The feeling is like you just ran into a 100 mph headwind. If you logged FRP, it would suddenly drop out from under you. This causes the loss. Then the valve resets itself after the run. The code itself may create a limp home mode. I have experienced the loss, and dethrottled before it tipped the code, good to go. Other times, not so lucky.

There is a shim mod that is very effective. You can even purchase a shim mod kit, maybe PPE?
 

·
Registered
Joined
·
30 Posts
Discussion Starter #5
this is exactly what is going on if i let up at just the right time i can maintain powe before it throws the code looks like i be going to try and have the pump shimmed thanks again
 

·
Registered
Joined
·
30 Posts
Discussion Starter #6
correction i will hve the relief valve shimmed i am assumig it puts more pressure on the relief valve spring keeping it from opening early thus maintainig more fuel pressure looks like a simple cheap fix at least its a cheap place to start didnt know there was anything cheap in this game lol:)
 

·
BUG JUICER and
Joined
·
1,239 Posts
yes. This one is relatively painless. i even keep the tools for this in a separate kit along with extra washers.

Be careful you do not use the wrong wrench. that bolt is brutally tight. You will need a good wrench (18 mm IIRC) fit, extra leverage, and DONT LET IT SLIP OFF. If you round it over, you will be cursing for weeks.
 

·
Senior Member
Joined
·
3,754 Posts
These d maxxes dont have a lift pump in the fuel tank. They ahve a lift pump built into the back of the cp3 pump that has to suck all the way from the tank, not effective. Run a lift pump (like a fass system), extra filter, separates air from the fuel and is a pump all in one.
 

·
Mafia member #105
Joined
·
2,262 Posts
The factory cp3 doent have a lift pump built to the back of it, the cp3 pulls fuel fron the tank with vacum,I'm running a stock fprv and not throwing the p0087 best fix for this is a lift pump, I have ran the shim kit and the race valve best fix is a lift pump first, over time the fprv will start to get weak and then would be a good time to do a bottle test and then if it fails or even bottle test it before the lift pump if you are not getting fuel in the bottle its just the rail going dry and the lift pump will fix it.
 

·
Registered
Joined
·
30 Posts
Discussion Starter #10
thanks all for input!!!

this is a great site with much knowledge to be gained here through much surfing last night i found this to be a fairly common code with a programmer with a few possible fixes all basically working to im prove fuel flow i am goin to first do a bottle test(great idea wish id though of it) if it passes im going to replace filter element in case i got some bad fuel(just a note on this i believe the new fuel is more prone to slime in storage tanks than the older higher sulphur fuel im in the trucking business and went to a seminar on the new diesel its not the greatest stuff in the world ) so i suppose i could have got some bad fuel regardless i think i will install a lift pump seems to me more pressure couldnt hurt if bottle test fails i will shim fpr valve which i will prob do any way i ncase it gets weak i will let you all know how it pans out again thanks for all the great input!!! you guys rock!!!!!!ks: :smoke :usflag :itsdead
 

·
Registered
Joined
·
10 Posts
I sufer from the 0087 code with my truck when I have my race tune in. my problem is I drain the rail not that the valve is popping. I cna watch my rail pressure drop from commanded 26k all the way down to 18k. a lift pump is in my very near future. I finally have all my parts together I just need the time to install it. I agree with ripm that its probably a lack of fuel and you will need a pump. the botle test will tell you for sure.

good luck
 

·
BUG JUICER and
Joined
·
1,239 Posts
tinman22 said:
I sufer from the 0087 code with my truck when I have my race tune in. my problem is I drain the rail not that the valve is popping. I cna watch my rail pressure drop from commanded 26k all the way down to 18k.
that is a good way to differentiate. Those who have the FPRV pop will be able to see FRP drop off very steeply and instantly, IIRC, to less than 10,000 psi. If you see that with a tune under 400 HP, the FPRV is popping, IMO.

The more gradual reduction to 18,000 would likely go unnoticed (SOTP) were it not for the code.

FPRV's seem to vary widely. I have noticed that in hotter weather, it would pop more. Hopefully I have not confused this for sudden pump cavitation.
 

·
Registered
Joined
·
30 Posts
Discussion Starter #13
mine being an instant pressure drop(feels like your turning off the key at wot) im leaning towards the valve but only because ive ran this tune for quite a while with no noticable supply problems before this one came p it literally goes from haulin *** to getting slammed in the face by a 100 mph headwind as killer bee described ive decided to just get a race valve filter was ok(forgot to get you those measurements killer bee be back under the hood soon) start with the cheap stuff and order a lift pump next do a water injection to lower the egts a tad as i use this truck pretty hard for work and play lots of big hills here in vermont going to try and monitor fuel pressure while driving and see how instant a drop it is ifi i dont post in a while im prob in hospital cause i drove off the road LOL race valve was only 40 bucks any way vs tearing apart old one hoping get it back together without screwing it up do i need to get one of those fancy 600 dollar fass systems or can i keep it simple saw one on some site for around 200 but it didnt have the extra filter
 

·
Registered
Joined
·
30 Posts
Discussion Starter #14
:smoke :smoke :usflag mine being an instant pressure drop(feels like your turning off the key at wot) im leaning towards the valve but only because ive ran this tune for quite a while with no noticable supply problems before this one came p it literally goes from haulin *** to getting slammed in the face by a 100 mph headwind as killer bee described ive decided to just get a race valve filter was ok(forgot to get you those measurements killer bee be back under the hood soon) start with the cheap stuff and order a lift pump next do a water injection to lower the egts a tad as i use this truck pretty hard for work and play lots of big hills here in vermont going to try and monitor fuel pressure while driving and see how instant a drop it is ifi i dont post in a while im prob in hospital cause i drove off the road LOL race valve was only 40 bucks any way vs tearing apart old one hoping get it back together without screwing it up do i need to get one of those fancy 600 dollar fass systems or can i keep it simple saw one on some site for around 200 but it didnt have the extra filter
 

·
Registered
Joined
·
30 Posts
Discussion Starter #15
update fprv did not solve prob nor did fuel filter lift pump next stay tuned
 
1 - 15 of 15 Posts
Status
Not open for further replies.
Top