what to check for irratic idle and stalling?

jacky599r · 01-23-2009, 03:28 PM

Hello,

I have this problem quite sometime back but its starting annoy me even more as the day passes. The car idles smoothly at times, just like stock. However, at times (getting more frequently) it will seems like its hunting to get back to the ideal idle rpm, causing the oil press alarm in my defi to go off with it. Ive cleaned my tb and maf sensor. A point to note is i have a cusco super single clutch kit which comes with a lightened flywheel. The thing is the erratic idle problem has already been there but i guess the lightened flywheel just escalated it and made it the engine stall occasionally. I would like to check who has got the same experience and what can i do / check to remedy the situation. Cheers!

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GrimmSpeed · 01-23-2009, 04:23 PM

Check your sparkplugs and electric. If everything seems fine there try consulting your tuner or posting logs online.

Mike

verc · 01-23-2009, 04:54 PM

Check your grounds too. Do you have aftermarket electronics? Make sure everything is properly grounded. No exposed wires, no miswired stuff. This happens quite often and messes with your idle.

Also, check that you have oil haha. <-- stupid I know, but one time it turned out I had very little oil in the car for some odd reason....

the suicidal eggroll · 01-23-2009, 05:32 PM

Do you have a wideband or can make some logs?
Sounds like a vacuum leak to me

Unabomber · 01-23-2009, 06:13 PM

Most weird idles problems are due to vacuum leaks in my experience. Check all your vacuum fittings and lines.

saab-on-the-cobb · 01-23-2009, 10:44 PM

Quote:

Originally Posted by Unabomber

Most weird idles problems are due to vacuum leaks in my experience. Check all your vacuum fittings and lines.

Yes, and inspect the MAF sensor for dirt/buildup.

sotc

jacky599r · 01-24-2009, 06:19 AM

yo. Thanks. The problem will start to show during e warm up cycle. Its very pronounced during a stop and go situation, like that of parking my car. I must admit e electric system is not the best since i have tie engine pulled twice affecting the groundings. I do have a wide band and will loh and post it

xrallyx · 01-24-2009, 04:59 PM

maf/map vac lines, replacement of bypass/recirculating valve with bov?

Iflysti06 · 01-25-2009, 07:28 AM

Had the same problem once and grounding was my issue!

jacky599r · 01-26-2009, 06:58 AM

argh, my new laptop just wouldnt sync with the usb to serial controller! pissed and i cant get any logs out.
Anyway, how do u go about checking that its the grounding thats causing this?

the suicidal eggroll · 01-26-2009, 09:51 AM

No need to log the wideband as long as you have a gauge on it, just tell us what it's doing.

jacky599r · 01-26-2009, 10:20 AM

ok, sure i think ill log down just the activites in idle without the wideband

jacky599r · 01-27-2009, 11:34 AM

where can i get the instructions to post datalogs?
i have some logs from my utec

scottD · 01-27-2009, 12:03 PM

Do you have an after market BOV?
Sounds like you may need a stronger spring in it...

jacky599r · 01-27-2009, 01:05 PM

hmmm. i have the forged bpv. it holds boost well as i just got the car tuned.

01-23-2009, 03:28 PM	#1
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	what to check for irratic idle and stalling? Hello, I have this problem quite sometime back but its starting annoy me even more as the day passes. The car idles smoothly at times, just like stock. However, at times (getting more frequently) it will seems like its hunting to get back to the ideal idle rpm, causing the oil press alarm in my defi to go off with it. Ive cleaned my tb and maf sensor. A point to note is i have a cusco super single clutch kit which comes with a lightened flywheel. The thing is the erratic idle problem has already been there but i guess the lightened flywheel just escalated it and made it the engine stall occasionally. I would like to check who has got the same experience and what can i do / check to remedy the situation. Cheers! * Registered users of the site do not see these ads.

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01-23-2009, 04:23 PM	#2
GrimmSpeed NASIOC Vendor Member#: 136396 Join Date: Jan 2007 Chapter/Region: MWSOC Location: Minneapolis, MN Vehicle: 2012 wrx white	Check your sparkplugs and electric. If everything seems fine there try consulting your tuner or posting logs online. Mike

01-23-2009, 04:54 PM	#3
verc Scooby Specialist Member#: 41754 Join Date: Aug 2003 Location: san ramon Vehicle: 03 wrx gt35r, 2.5L, meth	Check your grounds too. Do you have aftermarket electronics? Make sure everything is properly grounded. No exposed wires, no miswired stuff. This happens quite often and messes with your idle. Also, check that you have oil haha. <-- stupid I know, but one time it turned out I had very little oil in the car for some odd reason....

01-23-2009, 05:32 PM	#4
the suicidal eggroll NASIOC Supporter Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi 2012 WRX	Do you have a wideband or can make some logs? Sounds like a vacuum leak to me

01-23-2009, 06:13 PM	#5
Unabomber Big Ron Moderator Member#: 18062 Join Date: Apr 2002 Chapter/Region: MAIC Location: I can save you a ton of cash Vehicle: on car parts so PM me b4 j00 buy	Most weird idles problems are due to vacuum leaks in my experience. Check all your vacuum fittings and lines.

01-24-2009, 06:19 AM	#7
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	yo. Thanks. The problem will start to show during e warm up cycle. Its very pronounced during a stop and go situation, like that of parking my car. I must admit e electric system is not the best since i have tie engine pulled twice affecting the groundings. I do have a wide band and will loh and post it

01-24-2009, 04:59 PM	#8
xrallyx Scooby Newbie Member#: 184292 Join Date: Jul 2008 Location: cincinnati	maf/map vac lines, replacement of bypass/recirculating valve with bov?

01-25-2009, 07:28 AM	#9
Iflysti06 Scooby Newbie Member#: 156955 Join Date: Aug 2007 Chapter/Region: SWIC Location: Peoria, AZ Vehicle: 2006 STI UR GT35R w/ mad bolt ons	Had the same problem once and grounding was my issue!

01-26-2009, 06:58 AM	#10
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	argh, my new laptop just wouldnt sync with the usb to serial controller! pissed and i cant get any logs out. Anyway, how do u go about checking that its the grounding thats causing this?

01-26-2009, 09:51 AM	#11
the suicidal eggroll NASIOC Supporter Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi 2012 WRX	No need to log the wideband as long as you have a gauge on it, just tell us what it's doing.

01-26-2009, 10:20 AM	#12
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	ok, sure i think ill log down just the activites in idle without the wideband

01-27-2009, 11:34 AM	#13
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	where can i get the instructions to post datalogs? i have some logs from my utec

01-27-2009, 12:03 PM	#14
scottD Scooby Newbie Member#: 94748 Join Date: Aug 2005 Chapter/Region: South East Location: orlandooooh	Do you have an after market BOV? Sounds like you may need a stronger spring in it...

01-27-2009, 01:05 PM	#15
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	hmmm. i have the forged bpv. it holds boost well as i just got the car tuned.