idle issues when doing a warm start

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Old Aug 16, 2007 | 01:31 PM
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Default idle issues when doing a warm start

Well I tried this in Forced induction and got no help at all so wondering if the EF crowd can shed some light on this:

I am puzzled by the way the car idles after startup when already warm.
It will idle very low around 500rpms AF ratio is around 20:1 and of course it wants to die. Let it idle like that for about 2 minutes and it comes back to normal and idles around 14.5-15.

Another problem, probably related to this one, is that sometimes when I stop at a light and rev it to go after it turns green the car will either bog for a quick second 8:1, 9:1 AF and then go or just completely die there. This also does not happen all the time.

Could this be a problem with a vacuum line or the o2 sensor?

I can take some pics of the vacuum line setup tonight if you guys need.

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Old Nov 27, 2007 | 07:31 AM
  #2  
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Default Re: idle issues when doing a warm start (Mr_ET)

bump back up still have not fixed this. It is also too rich during cold starts. I know the ecu is good and I have no vacuum leaks and the turboedit map used to idle another sohc ZC engine with dsm blue top 450's perfect.

Could this all be a problem with my injectors? all for blue tops are missing their pintle caps but I could not see any damage to the tip.
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Old Nov 28, 2007 | 08:46 AM
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Default Re: idle issues when doing a warm start (Mr_ET)

I have read more into this and I think it is either related to the iavc, the fitv or my injectors.

symptoms:

cold starts
-need to be wot to start but starts easily that way
-car runs much too rich (10.5:1 dips down more if I press on the gas fast)
-idles fine

warm starts
-need to be wot and will take about 10 seconds to fire up very slowly
-idles at 450-500 and super lean for about 20 seconds
-then idles at 750-800 at about 14.5:1 and will dip down to 16.5:1 every minute or so. This make it idle lower for those few seconds.

------------------------------------------------------------------------------------------
-The coolant should be fine without bubbles (bleeded by 2 different people both experts with hondas)
-iavc has never been touched
-Coolant line from the fitv to the back of the block was changed when I put the turbo on (car ran perfect before the turbo)
-car runs on Turboedit same motor, ecu and injectors as a friend and his used to idle perfect.

So my questions are?

could the injectors be defective and cause these problems but run great everywhere else in the rpm range?
could the iavc or fitv have air bubbles that would cause the too rich cold starts and hunting idle when warm?

I'd really appreciate the help
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