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03-21-2008, 09:55 PM | #1 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
PROBLEM WITH MY WRX STI - please help me
hi guys would u be able to help me with a problem i have with my wrx sti 97. i know u didnt receive the early sti's but all your comments will still link up if it were a 2004 etc.
ok my car has an idling problem. everytime i start the car cold it has a decent idle about 1000rpm until it warms up then when i approach lights or a stop sign the revs drop to the 100rpm mark then raises to about 800rpm OR cuts out completely. the rev's flucuate often. it has its standard air intake box. its been backfiring lately also just little ones from time to time. just wondering if u guys could put your finger on the problem for me so i know where to look because i have no ideas at the moment. please help me i cant use my car!
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03-21-2008, 09:59 PM | #2 |
Scooby Specialist
Member#: 163892
Join Date: Nov 2007
Chapter/Region:
NESIC
Location: Eastern Connecticut
Vehicle:05 AW STI:SOLD Black 93 Singled tt Supra |
By any chance do you have an atmospheric bov installed on the car?
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03-21-2008, 10:01 PM | #3 |
Scooby Newbie
Member#: 75835
Join Date: Nov 2004
Location: hamilton ohio
Vehicle:1992 dontask white |
sounds like lost vacuum. hit the brakes, it drops fast your losing vacuum and taking more away with pedal pressure.
good one too^^^ |
03-22-2008, 12:02 AM | #4 |
Scooby Guru
Member#: 39086
Join Date: Jun 2003
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:2004 STi White |
Do you have a vacuum/boost gage? If not there are inexpensive ugly tool box ones you can hook up to see if it's a vacuum problem. (I've had one for 30 years)
False air is another potential problem. Get a can of starter fluid and spray the outside of the intake hoses. If the revs rise then you have a leak. The USDM STi has a drive by wire throttle and for cold starts the ECU just cracks the butterfly for fast idle. Cold it's ~1500 rpm. I don't know how your STi does this. Warm my car idles at about 700 rpm. |
03-22-2008, 12:58 AM | #5 |
Scooby Newbie
Member#: 173508
Join Date: Mar 2008
Location: New Zealand (Te Awamutu
Vehicle:2001 WRX sti v7 Blue |
just check your blow off valve, chances are its leaking
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03-22-2008, 10:07 AM | #6 |
Scooby Newbie
Member#: 162077
Join Date: Oct 2007
Location: Amarillo TX
Vehicle:07 STI Blue |
if you have some throttle body cleaner or even carb. cleaner, let the engine warm up and spray around the intake manifold and see if you idle changes. sometimes when the engine warms up and ur intake gaskets are not sealing right it will cause a vacuum leak.
Rey |
03-23-2008, 07:28 PM | #7 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
problems with my sti
i dont know much about bov's but i know that it is a large thing that directly hooks up to my intercooler and has a selectable / rotatable bov attachment which has diff size holes to suit how loud ya want it.
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03-23-2008, 07:30 PM | #8 |
Scooby Guru
Member#: 94615
Join Date: Aug 2005
Chapter/Region:
MAIC
Location: Wilmington, DE
Vehicle:2017 VW GTI S1+ 2006 STi 341WHP/356TQ |
yeah.. sounds like it leaking somewhere.. or maybe the idle air control valve (IACV) or FIACV.. check for coolant/vaccume leaks.. or maybe just try to adjust the BOV.
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03-23-2008, 09:18 PM | #9 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
very good suggestions ty and yes i do have a boost gauge. how am i supposed to check for vacuum leaks? i mean negative pressure is kind of hard to check
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03-23-2008, 09:20 PM | #10 |
Scooby Specialist
Member#: 173002
Join Date: Feb 2008
Chapter/Region:
NESIC
Location: New Hampshire
Vehicle:2002 WRX WRB |
with a hand held vacuum pump/gauge.
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03-23-2008, 10:40 PM | #11 | |
Scooby Specialist
Member#: 40453
Join Date: Jul 2003
Chapter/Region:
South East
Location: Metairie, Louisiana
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Quote:
Apexi twin chamber bov. I have one on my car. If this is what you have, it is most likely stuck open. You need to take it off, clean it and lube it. I got the exact same symptoms as you are describing when mine got stuck open before. |
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03-23-2008, 10:44 PM | #12 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
yes thats the one! youve done well. ill check it now and get back to you! thanks!
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03-24-2008, 02:00 AM | #13 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
i checked the bov and it appeared to have a black sut like substance around the sides but dont think this was the problem.
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03-24-2008, 08:29 AM | #14 |
Scooby Specialist
Member#: 40453
Join Date: Jul 2003
Chapter/Region:
South East
Location: Metairie, Louisiana
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You would have to take it apart and clean it. You won't be able to see anything from the outside. The black stuff is oil/blow by. It gunks up the inside of the valve, traps dirt and dust in there and makes it stick open. It is probably held on by two allen head screws. Take those off. Then the housing is held together by four allen head screws. Take those off. Clean the inside out. Put it back together and reinstall.
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03-25-2008, 01:30 AM | #15 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
ok cleaned out the whole thing and oiled up. no difference with the idle and i noticed everytime i rev the car high it back fires (not normal). also i noticed the engine makes bit of a squeeling kind of noise. and thirdly everytime i boost it and release the accelerator my bov sounds out (i dont know if this is normal either as i just got the car pretty much and i thought its only supposed to do it when i change gears :S. -please help me
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03-25-2008, 09:27 AM | #16 |
Scooby Specialist
Member#: 136929
Join Date: Jan 2007
Chapter/Region:
Tri-State
Location: NY
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You could swap it out?
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03-25-2008, 09:38 AM | #17 |
Scooby Specialist
Member#: 122654
Join Date: Aug 2006
Chapter/Region:
NESIC
Location: Wayland, MA
Vehicle:2002 v8 STI w/ GT30R 2013 GTR & M-Sport 335xi |
Are you back-firing or after-firing?
Back-firing is combustion in the intake tract while after-fire is in your exhaust tract; which is it for your case? After-fire would lead me to think you have a leak in your vacuum lines and the above suggestion by others to use carburetor cleaner in attempt to locate the leak is a sound one. The BOV is also a very likely candidate to cause that. Do you have a stock BPV or another BOV to try swapping your current one with to aid with the troubleshooting? If you are backfiring, check your MAF; you might need to clean it. Also, if you can, check your plugs and injectors. I had serious and rather comical backfiring when my fuel delivery system was intentionally screwed-up - it's a long story Other than that, I am not sure what else to offer you with your current description of the symptoms. |
03-25-2008, 10:02 AM | #18 |
Scooby Specialist
Member#: 40453
Join Date: Jul 2003
Chapter/Region:
South East
Location: Metairie, Louisiana
|
Tighten the screw on top of the valve. Since it was taken apart it probably needs to be readjusted. (at least mine does after I clean it) It may be leaking at idle. It is supposed to blow off everytime you let off the throttle and you are in boost. The squealing I don't know about, but the bad idle sounds like a leak somewhere.
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03-25-2008, 03:10 PM | #19 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
would this leak effect my boost?
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03-25-2008, 03:21 PM | #20 |
Scooby Newbie
Member#: 65562
Join Date: Jul 2004
Chapter/Region:
RMIC
Location: Denver, CO
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A leaking BOV would likely effect your boost.
To me it sounds like either your front O2 sensor or MAF has gone bad. But neither of those would cause squealing... |
03-26-2008, 11:15 PM | #21 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
what does adjusting the bov do?
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03-27-2008, 01:08 AM | #22 |
Scooby Newbie
Member#: 164022
Join Date: Nov 2007
Chapter/Region:
NWIC
Location: Eugene/Medford OR
Vehicle:2002 Stage 2 wag. PSM |
take that BOV off, put the stock BPV on.
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03-27-2008, 02:09 AM | #23 |
Scooby Newbie
Member#: 175230
Join Date: Mar 2008
Chapter/Region:
International
Location: New Zealand
Vehicle:1997 Wrx STI RA White |
but i like my bov
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03-27-2008, 08:14 AM | #24 |
Scooby Specialist
Member#: 122654
Join Date: Aug 2006
Chapter/Region:
NESIC
Location: Wayland, MA
Vehicle:2002 v8 STI w/ GT30R 2013 GTR & M-Sport 335xi |
That read rather comical; akin to a parent telling a child that candy is bad.
Anyways, bradsti, try doing what wagoneer02 mentioned just for the sake of troubleshooting. If it doesn't solve your problems, continue using said BOV. If it does, you might want to look into repairing/replacing that BOV of yours. |
03-27-2008, 08:34 AM | #25 |
Scooby Specialist
Member#: 40453
Join Date: Jul 2003
Chapter/Region:
South East
Location: Metairie, Louisiana
|
I am wondering if he has a front mount, because that bov is not a direct bolt on for the car. I have that same valve for my fmic and there was no kit/flange available for it to bolt up to the stock ic.
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