Hey guys,

Was leaving a performance shop the other day, they didnt do anything to my car or nothing, actually scheduled a dyno tommorow, and my car out of nowhere went to "Engine Power Reduced" popped a CEL, and now im stuck. Took it to the dealer. They called today and said that I need to take all my bolt-ons off b4 they work on it.

I am missing the turbo to airbox piece from the intake as I shipped it to a member on here who broke theirs, so Is their a GM tech or some1 who can tell me what this might be and if one of my parts is causing it?

Malfunction to Fuel Control System - P0087

Car idle's fine and everything, was such a freak thing. Mods are Dejon Intake, Dejon Charge pipes, Hahn BOV delete plate, Greddy RS BOV. Been working fine like this for months now.

ALSO, if anyone has that factory airbox piece and can ship it to me plz let me know!

 

bump since 18 views and no1 knows wtf to do


any1 wanna loan me an intake piece. I can even ship it back when im done

 

I don't know what to tell you, but look at page 9 of this

http://service.gm.com/gmspo/mode6/pd...F%20Engine.pdf

 

From you post did I get this correct. You are driving around with this duct missing? If that is the case that could be causing the problem since the air meter is not measuring the air actually going into the turbo. Since the fuel pressure is scheduled at least partly based on airflow as you open the trottle hight fuel pressure is required but with the air meter basically isolated the fuel pressure would be delivered for a closed throttle mode. This could have very bad consequences.

 

P0087 is for fuel rail pressure too low. Can be caused by a worn lobe on the cam that drives the high pressure pump, or a faulty injector, pump, or fuel pressure sensor. None of these things have anything to do with your mods from what i can tell. Dont know why the dealer is concerned about your aftermarket parts. They should at least look at it to diagnose it and if an aftermarket part caused the failure, charge you to fix it or if not, fix it under warrenty

It looks like he has a Dejon intake, He is missing this piece in order to return it to stock. Correct me if i am wrong

 

hey, according to the code its the high pressure system for the fuel pump... i would go and check if your IC pipping hit it...

they have a recall going through right now apparently the stock pipping disconnects and wacks the fuel system right there by it... causing it to fail... and since this would be the case considering the CEL code is for the high pressure fuel pump...

 

i have a dejon intake as well, i kept my stock air box an pieces just let me know if u still need it

 

His quote if I read it correctly, which is why I posted the picture above, says he is running the car with absolutely no pipe between the air cleaner and the inlet to the turbo. So he is not reading the airflow into the engine correctly or at all, so.... fuel pressure is scheduled based on load 600 - 800psi at idle and over 2100 psi at full load. If he is not reading the airflow correctly the computer doesn't know if he is a closed throttle or wide open. so he can set the code just based on the missing part in his intake system.

He need to put a complete air cleaner system in and see if the code resets or is gone forever.

 

That is what I though, but I think he may be talking about the BPV or breather line forgot the exact term for it.

 

well, this is my 2 cents, if its going into limp mode, and the car runs fine just dont push hard anymore, i just unplug the computer and battery for a few minutes and then plug it all back in and it goes away.. i used to go into limp mode all the time when i had all my mods but no tune, cuz i would overboost real bad and what not so thats what i did, and as long as i kept my foot out of the pedal for longer than 4 or 5 seconds lol i never went into limp mode again...

 

Is it okay if I disagree

Fix the problem of the missing piece on your car and make it work correctly. Don't work around the issue.

 

ok let me elaborate more. I appreciate all the response guys !

I have a dejon intake. I would never just disconnect the factory airbox and put a filter on it lmao. what i meant by saying "im missing the airbox to turbo piece" is in order for the dealer to look at it, I need to return it to stock and the FACTORY Turbo to Airbox piece is what I am missing. I have an aftermarket intake on the car now, and in order to see if thats the problem I would need some1 to loan me a factory airbox to turbo piece. But i was just seeing if an intake would even cause low fuel pressure. I have dejon charge pipes, ill check them to make sure they arent rubbing on anything, but i dont believe any fuel lines broke as there is no leaks or liquids underneath my car. If it rubbed through a line it would idle weird and should be spewing fuel.

And for the "just dont drive it hard and disconnect the battery etc." as soon as my car cranks up it goes into limp mode b4 i even make it out of the driveway

 

The fuel lines would rub through the piping before the other way around.



Trust me.

If you blew a fuel line, YOU WOULD KNOW IT.

 

bump

 

i got the same problem so i erase the code with a obd2 and it comes right back up so my tuner is tuning it back to stock and shes on her way to the dealer.

 

you need to replace your high pressure fuel pump. My dealer swore it was not the issue, when brought to a performance shop they put there ear to my High pressure fuel pump and they said it wasnt making any noise. They replaced it and that solved the problem. The part if $500 though so if you cant get it warrentied defintily try.

 

^this guy is correct. You and your car would be on fire.

Hope this helps.

 

Sorry for reviving this thread lol, but I have the same issue right now on my 08 TC. Took it to the dealer and they are seriously looking for every option to turn me down coverage. They said they wont replace the part unless the pressure is out side the range of 57-69psi. I don't have a GM Scanner to read fuel pressure so i would have no idea what the pressure actually is, and I really don't want to pay their service fee of $105 if I'm wrong... Next thing I'm sure they will turn me down for aftermarket parts... ideas on what to do?

Update: fuel pressure is 66.7psi. However this code is for the fuel rail system? So pressure should be 2100psi?

 

Pressure can vary depending on load. at WOT it can hit 2100 PSI but it varies. No mod will cause a broken HPFP so I would take it to a different dealer if they fight it that bad.

 

Really? You don't consider a full E85 bolt on tune to be destructive to the car? Anything is possible with that kind of setup.

 

Ah, i did not see his sig. What i meant was bolt ons. you tell me what bolt on breaks a HPFP. I'd like to know...

 

Putting aside bolt ons because they don't put strain on the fuel system... However i could see E85 being a variable for the fuel system. But I'm on a Trifecta tune made by Vince, its not a really aggressive tune by all means. So honestly, how much damage could the E85 really do to the fuel system to cause a failure like this? Thanks for the quick response btw guys.

 

Well if he is running E85 that would lead me to assume that maybe his fuel pump cannot deliver the fuel, and has failed?, or bad injector/s?

 

So, after taking it to the dealer today, including all my performance mods and leaving the car on E85, they have agreed to replace the HPFP and the throttle body which was thrown out of position?? don't know what caused that... but either way the dealer is fixing it!

However, this was after several attempts of the service employee attempting to find several ways to not afford coverage. lol

 

Nice man good deal, let me know I have my used TB i can sell, and ship to you if they try to charge you for it. I bought a brand new one, and is on the car right now but I thought my TP sensor went out so that is why I got a new one, but that wasnt the probalem lol so now I got 2! Let me know, and good to hear man.