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Old 04-08-2013, 12:49 PM   #1
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default 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.
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Old 04-08-2013, 01:55 PM   #2
seventhgear
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Join Date: Jan 2011
Location: Palmer
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2008 Spec b
Diamond grey metallic

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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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Old 04-08-2013, 02:01 PM   #3
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Cai.
If all parts list is needed i will post. Its long
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Old 04-08-2013, 03:24 PM   #4
Alaskan EJ20
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Member#: 160040
Join Date: Sep 2007
Chapter/Region: AKIC
Location: Anchortown
Vehicle:
2002 Bugi / 1993 L
Symmetry Tuning

Default

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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Old 04-08-2013, 03:25 PM   #5
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Well doesnt that sound horrible. 7k on a built motor? And gonna blow?

Im gonna start with a Vacuum leak test
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Old 04-08-2013, 03:27 PM   #6
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

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.
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Old 04-08-2013, 03:30 PM   #7
Alaskan EJ20
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Location: Anchortown
Vehicle:
2002 Bugi / 1993 L
Symmetry Tuning

Default

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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Old 04-08-2013, 03:33 PM   #8
cosseywrx
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Location: Abilene, TX
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2005 2.1 stroker WRX
OBP

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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
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Old 04-08-2013, 03:38 PM   #9
cosseywrx
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Location: Abilene, TX
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2005 2.1 stroker WRX
OBP

Default

Boost leak should cause a lean or rich reading which i have not seen.
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Old 04-08-2013, 03:39 PM   #10
Alaskan EJ20
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Location: Anchortown
Vehicle:
2002 Bugi / 1993 L
Symmetry Tuning

Default

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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Old 04-08-2013, 03:40 PM   #11
Alaskan EJ20
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2002 Bugi / 1993 L
Symmetry Tuning

Default

Quote:
Originally Posted by cosseywrx View Post
Boost leak should cause a lean or rich reading which i have not seen.
do you log with a computer to see that?? your AFR gauge will not tell you if the ECU is compensating for a leak.
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Old 04-08-2013, 03:42 PM   #12
Alaskan EJ20
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Member#: 160040
Join Date: Sep 2007
Chapter/Region: AKIC
Location: Anchortown
Vehicle:
2002 Bugi / 1993 L
Symmetry Tuning

Default

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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Old 04-08-2013, 03:44 PM   #13
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Denso sensor. Stock replacement. I use opensource.

No tune afecting parts have been changed since the motor was built.
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Old 04-08-2013, 03:47 PM   #14
Alaskan EJ20
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Member#: 160040
Join Date: Sep 2007
Chapter/Region: AKIC
Location: Anchortown
Vehicle:
2002 Bugi / 1993 L
Symmetry Tuning

Default

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
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Old 04-08-2013, 04:00 PM   #15
EvoChArGeR
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Location: Anchorage, AK
Default

Who tuned your car?
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Old 04-08-2013, 11:26 PM   #16
cosseywrx
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Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Paul element ak.

Gonna start with a heavier spring for the bov.

May be opening early.
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Old 04-09-2013, 02:35 AM   #17
islaw
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04 STI
WRB

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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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