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Old 08-07-2007, 09:51 AM   #1
ejh25
Scooby Specialist
 
Member#: 65267
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Arlington, VA
Vehicle:
2002 WRX
Silver

Default Cold Start Issues

My idle is pretty smooth above 70 or 80C but at initial startup it always stalls unless I keep my foot on the gas.
It will rev to 1600 and then immediately drop off and stall out.
I've added a little bit to the post start enrichment tables and it has started to help. Is there another adjustment I should be looking at?
Thanks,
Eric
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Old 08-07-2007, 10:14 AM   #2
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

Post start effects the first 60 seconds so continue to increase it. If it stays running and then stalls after 60 seconds or the idle starts to hunt, increase the coolant temp trim.

Thanks,
Phil
www.elementtuning.com
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Old 08-08-2007, 11:02 AM   #3
ejh25
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Join Date: Jun 2004
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Location: Arlington, VA
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2002 WRX
Silver

Default

Okay...I bumped up the post start enrichment figures a good amount up to 50c, particularly in the 30 and 40c cells.
This has made a big difference, although I do appear to get some oscillation in the idle for a little bit.

Should I take the proportional down a hair?
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Old 08-08-2007, 11:05 AM   #4
ejh25
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Member#: 65267
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Arlington, VA
Vehicle:
2002 WRX
Silver

Default Rich Idling

I've been able to get my car to primarily idle in the high 13s and low 14s.
When the radiator fan is on or the in cabin fan is on the car idles consistently in the low 14s. When either of these shuts off the idle richens up sometimes dipping into the high 11s for a second or two.

I bumped up the rpm idle from 928 to 944 and the integral up a hair as well as the step up.

The car becomes pretty sensitive to stalling out if I start removing fuel.

I guess I need to be pretty specific about which idle sites I'm playing with.

Any thoughts?

Thanks,
Eric
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Old 08-08-2007, 01:11 PM   #5
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

Quote:
Originally Posted by ejh25 View Post
Okay...I bumped up the post start enrichment figures a good amount up to 50c, particularly in the 30 and 40c cells.
This has made a big difference, although I do appear to get some oscillation in the idle for a little bit.

Should I take the proportional down a hair?
The PID function isn't really the problem, it's the fuel map. I would increase the fueling more if you have an oscillation but typically it's because the load cell is changing and this load cell does not result in the same AFR as the previous. You must make these even as load changes such as when the radiator fans turn on. Remember the Hydra samples the surrounding load cells, not just the cell it's in.

Thanks,
Phil
www.elementtuning.com
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Old 09-02-2007, 04:46 AM   #6
POLARBEAR666
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Location: Western Australia
Vehicle:
1999 Ver 5 STI Coupe
Black

Default

Quote:
Originally Posted by ejh25 View Post
My idle is pretty smooth above 70 or 80C but at initial startup it always stalls unless I keep my foot on the gas.
It will rev to 1600 and then immediately drop off and stall out.
I've added a little bit to the post start enrichment tables and it has started to help. Is there another adjustment I should be looking at?
Thanks,
Eric
You need to adjust the setting in the computer that relates to the minimum Kpa pressure before the car starts trying to control idle. If this amount is too low then by the time the car tries to control the idle it can't catch it.

Also look at Idle Stepper motor settings... u need the motor to be going at the right amount to catch the idle easily as it falls.
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Old 09-05-2007, 10:51 AM   #7
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

The 2002-2005 WRX is a little different and doesn't use a stepper ISC valve so the stepper settings are not used but instead the minimum ISC duty***37; can be adjusted. The pre 2004 RS platform in the US uses the stepper ISC valve.

Thanks,
Phil
www.elementtuning.com
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