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04-08-2013, 12:49 PM | #1 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Idle issues
Ok so sometimes ONLY at idle i have the following problems.
1. One time only this happened. The car was a warm start and idle had dropped low to 500 then as it raised the boost gauge raised up to 1psi ish and then the car rev'd to 3k and then settled back down to normal idle of 1k rpms. 2. The cars idle ONLY at idle will sometimes jump a few 100rpms and hang there a bit and then drop back down. Usually once the car is fully warmed up it will do this. This is not constant but does happen daily. Iacv has been removed and cleaned with new oring installed. MAF has been removed and cleaned. Front O2 sensor has been replaced and Afs all read normal. An ecu reset has been done at every part cleaning or replacement. For those that do not know i have a built 2.1 stroker. Any info would be appreciated. |
04-08-2013, 01:55 PM | #2 |
Scooby Newbie
Member#: 271518
Join Date: Jan 2011
Location: Palmer
Vehicle:2008 Spec b Diamond grey metallic |
Do you have a short ram or cold air intake? My wrx would do that on windy days only at idol.
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04-08-2013, 02:01 PM | #3 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Cai.
If all parts list is needed i will post. Its long |
04-08-2013, 03:24 PM | #4 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
its probably gonna blow soon.... sounds like bad rings, the engine is trying to keep compression, what was the break in procedure?
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04-08-2013, 03:25 PM | #5 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Well doesnt that sound horrible. 7k on a built motor? And gonna blow?
Im gonna start with a Vacuum leak test |
04-08-2013, 03:30 PM | #6 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
i think you worry to much, your on a custom built engine and worrying about a a 100 rpm bouncing idle, what injectors are you using, how old is the O2 sensor, boost leak also could cause it. the 79mm stroke in your engine is choppy anyway, are you cammed? what is the idle set to?
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04-08-2013, 03:27 PM | #7 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Pretty sure it was started until normal op temp then killed and oil change.
I beleive was a hard break in. If its gonna blow up it would have then. Element ak would have exact details. |
04-08-2013, 03:33 PM | #8 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Idle set at 1k rpms. It can jump up to 400rpms and remained there a while and come back down.
750cc dw injectors. Brand new o2 sensor as of last monday. No cams. Stock heads |
04-08-2013, 03:39 PM | #9 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
injectors may be culprit, DW aren't known for having the best idle properties when they get large. invest in some ID's maybe, also look at the tune, check on AC idle and fan switches ect. And check on the first response also, especially in fairbanks, try getting rid of the CAI and get a short ram, did you change the tube the MAF sits in after the tune??
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04-08-2013, 03:38 PM | #10 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Boost leak should cause a lean or rich reading which i have not seen.
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04-08-2013, 03:40 PM | #11 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
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04-08-2013, 03:42 PM | #12 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
where did you get the new O2 sensor, i wouldn't recommend any of the cheap rockauto sensors online, you get what you pay for..
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04-08-2013, 03:44 PM | #13 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Denso sensor. Stock replacement. I use opensource.
No tune afecting parts have been changed since the motor was built. |
04-08-2013, 03:47 PM | #14 |
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: Anchortown
Vehicle:2002 Bugi / 1993 L Symmetry Tuning |
k well id look for leak even if the afr is right on and consider a short ram as opposed to cold air and look into changing the injectors
and look at the tune |
04-08-2013, 04:00 PM | #15 |
Scooby Newbie
Member#: 117985
Join Date: Jun 2006
Location: Anchorage, AK
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Who tuned your car?
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04-08-2013, 11:26 PM | #16 |
Scooby Specialist
Member#: 276443
Join Date: Mar 2011
Chapter/Region:
TXIC
Location: Abilene, TX
Vehicle:2005 2.1 stroker WRX OBP |
Paul element ak.
Gonna start with a heavier spring for the bov. May be opening early. |
04-09-2013, 02:35 AM | #17 |
Scooby Newbie
Member#: 282043
Join Date: May 2011
Location: Anchorage
Vehicle:04 STI WRB |
Post a short video for us if you can. I had a similar problem and after 3 different tunes. Problem solved.
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