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03-02-2010, 12:22 PM | #1 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Rough idle - cold start up
Yes, I did search, but couldn't find anything useful. Here is a list of things I have done, but did not help.
1. IACV - disassembled completely and thoroughly cleaned 2. MAF sensor - cleaned 3. Checked vacuum lines and hoses Other than checking for plugs, coil packs (will check tonight), what else are there to check? This is very strange as rough idle is confined to cold start up. Once warmed up, car drives perfectly normal. Any other suggestion? |
03-02-2010, 12:52 PM | #2 |
Scooby Newbie
Member#: 200960
Join Date: Jan 2009
Chapter/Region:
TXIC
Location: San Antonio, tx
Vehicle:2005 WRX SR Red |
I have a similar problem and responded in the same ways you did. On some of these rough idles after first starting my car I notice that the ecu retards timing till after the idle smoothes out. It is not a common occurance but it has happened more than once. I think the idle could possibly be related to timing tensioner or belt as I have read of some rough start/idle issues related to a tensioner going out. Probably going to take of the cover and check for play in the tensioner/belt to see if it could be the culprit.
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03-02-2010, 01:31 PM | #3 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I recently had timing belt work done where everything including pulleys and tensioner got replaced. Plugs were recently replaced as well prior to getting a tune a month ago.
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03-02-2010, 04:15 PM | #4 |
Scooby Specialist
Member#: 151045
Join Date: Jun 2007
Location: Pennsylvania
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Pressure test the air intake and rule out any leaks. Visual inspection is great if the leak is obvious, but more commonly the leak is hidden out of view.
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03-02-2010, 05:02 PM | #5 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Leak check was OK when I got my car tuned unless new leak developed in the last 3-4 weeks. Since problem is seen only when car is COLD (start up), I highly doubt there is leak in the air intake. At any rate, I will double check again.
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03-02-2010, 06:23 PM | #6 |
Scooby Specialist
Member#: 188550
Join Date: Sep 2008
Chapter/Region:
NWIC
Location: Lynnwood, WA
Vehicle:2004 WRX WRB vf22'd |
i had a tgv motor go out on me. It caused the car to act like it had tgv deletes, and had a really odd idle. I don't know if this is similar to what youre experiencing, but its something to think about.
Grimmspeed sells em for dirt cheap. |
03-03-2010, 04:03 PM | #7 |
Scooby Newbie
Member#: 240090
Join Date: Mar 2010
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i had a similar issue where as my 05 wrx wagon would idle rough either on a cold start, or seldom @ a red light, i had recently replaced the belts, flushed my power steering line/res (just because it was time & the smoother it runs the less it pulls from your engine), re-adjusted belts, checked timing, & haven't had a problem since....
Good luck |
03-03-2010, 04:41 PM | #8 |
Scooby Specialist
Member#: 112612
Join Date: Apr 2006
Chapter/Region:
MWSOC
Location: Appleton,Wisconsin
Vehicle:2010 Legacy 2.5 CBS 2002 Impreza WRX WRB |
Your valves may need to be adjusted. The lash that is. I saw you have a 02 WRX, tuned with a VF34. I'd suspect the valve lash.
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03-03-2010, 07:51 PM | #9 |
Scooby Specialist
Member#: 40424
Join Date: Jul 2003
Chapter/Region:
MAIC
Location: NoVA
Vehicle:05 STi |
Fatten up the fuel trim at cold start and see if that fixes it. What are your trims like?
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03-03-2010, 08:04 PM | #10 |
Scooby Specialist
Member#: 187798
Join Date: Aug 2008
Chapter/Region:
MWSOC
Location: Elgin, IL
|
If you post a log of the rough idle we might be able to help better
Andy |
03-03-2010, 11:09 PM | #11 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Here is an update.
Cleaned the MAF sensor again using MAF cleaner (2nd time). This time, I spent more time and soaked the sensor in the cleaner for 20 min. Problem fixed.... |
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