|
|
|
|
Thread Tools | Display Modes |
08-03-2001, 01:11 PM | #1 |
Scooby Specialist
Member#: 7113
Join Date: Jun 2001
Chapter/Region:
TXIC
Location: Minnesotan in Texas
Vehicle:2008 Spec B DGM |
Fuel cut problem, help!
Ever so often now as I'm driving my RS, notably during deceleration and engine-braking, my fuel cuts and the engine kills. I'm able to turn it over again after a couple tries after giving it a little gas. After that it runs like nothing ever happened. This seems to happen only once everytime I take the car out, then doesn't happen again. Everything on the meters read normal: no knock detected, no abnormal EGT, no stutter before it happens. The only thing out of the ordinary is the AF meter seems to go off the lean side right when it happens, thus my theory of fuel cut.
While this problem is only a major annoyance at this point I don't want it to get any worse. Setups include a Hyper-R SFC fuel controller, Walbro fuel pump, and an old fuel filter. I plan on replacing the fuel filter out of general principal, but wondering if anyone else has any ideas regarding this problem. Thanks! ~Garrett
* Registered users of the site do not see these ads.
|
08-03-2001, 02:05 PM | #2 |
Miss You Mom
Oct 1940 - Feb 2008 Super Moderator Member#: 809
Join Date: Jan 2000
Chapter/Region:
NESIC
Location: NH, Land Of Many Trees
Vehicle:2000 2.5 RS, '14 For 92 5MT SVX |
It sounds like the fuel pump is being starved... does this happen mostly when declerating and around corners, especially with a less than full tank of gas?
Brian AIM: captaindamorgan ICQ: 84483950 http://www.northursalia.com http://www.imprezamods.com http://www.scoobymods.com IClub: It's not just for breakfast anymore! |
08-03-2001, 02:13 PM | #3 |
Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
You may be getting too much fuel... what are your fuel pressures like?
|
08-03-2001, 03:50 PM | #4 |
Scooby Specialist
Member#: 7113
Join Date: Jun 2001
Chapter/Region:
TXIC
Location: Minnesotan in Texas
Vehicle:2008 Spec B DGM |
Indeed the problem does seem to be occuring only on deceleration. The one time it happened at high speed there was no change in attitude, however. It was shortly after filling the gas tank that it happened. These other times seem to happen on half tank or less fuel situations.
And as for getting too much fuel I don't have a fuel pressure gauge installed... yet But isn't there a recirculator for unused fuel that sends it back to the tank? I know this has been occuring at lower revs but the fuel controller doesn't start adding fuel until about 4k rpm. Solutions? ~Garrett |
08-03-2001, 04:27 PM | #5 |
Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
Well the thing is, if you get off the accelerator there is still a split second where the ECU is sending the higher amount of fuel to the engine and if your fuel pressure is too high, you could drown out the engine and stall it. I suggest if you get a fuel pressure guage and it reads over 43 or so psi at idle, to get yourself a used fuel pressure regulator out of an old SVX or XT6. They'll snap right on (minus getting a longer hose for it) and they'll lower it to around 32-33psi at idle - where it should be.
|
08-06-2001, 10:28 AM | #6 |
Scooby Specialist
Member#: 7113
Join Date: Jun 2001
Chapter/Region:
TXIC
Location: Minnesotan in Texas
Vehicle:2008 Spec B DGM |
MAF??
Ok now the engine won't run with the MAF plugged in. So now it is either the MAF that is shot or there is a fatal problem with the FPR. With the MAF plugged in it will turn over, run for a couple seconds, then taper off and die. I unplugged the MAF and limped it home and it ran fine (well as fine as it can in limp mode). The MAF was just replaced about 4000 miles ago so I hope it isn't that. Could some other system be causing the engine to just die like that only when the MAF is plugged in?
How much do you think a dealer could troubleshoot a problem like this? I'm thinking if it is the MAF I'll find out how much a case of MAF sensors would cost, maybe I can get a deal in bulk Or how tough is a MAF to MAP swap? Does it just entail an ECU from a model with a MAP and the sensor? Or should I just scrape up some money and buy a Tech II? Any help would be appreciated... ~Garrett |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Help me !!! fuel cut problem (only in first gear) | julien | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 7 | 06-17-2007 05:13 PM |
Possible fuel cut problem?? | IlovemyRex | Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) | 5 | 03-08-2006 08:41 PM |
Fuel Cut problem, questions... | Eric1855 | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 11 | 03-07-2005 04:14 PM |
Fuel cut problem... back again :( | Unsung Boxer | Normally Aspirated with bolt-on Forced Induction Powertrain | 22 | 11-30-2003 04:47 PM |
Strange fuel cut problem. Any ideas? | Orbiter | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 0 | 05-14-2002 02:26 AM |