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Old 08-16-2009, 01:43 AM   #1
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Default car won't idle

Hello Megasquirt Geniuses.

I'm having a little trouble with a car that won't idle, and want to get opinions.

The megasquirt in question works flawlessly on my car, and idles like a champ. Then I popped it on another car and adjusted reqfuel... and for the life of me cannot get it to idle.

After starting the car, the rpms will slowly drop until it dies. The idle valve kicks in... but seems to have no affect.

I've adjusted nearly ever idle setting, as well as the fuel and spark maps, and nothing seems to make a difference. The best I can do is advance the idle or timing so much that it idles at a very high rpm (1300+).

Any thoughts?
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JustinHoMi is offline   Reply With Quote
Old 08-16-2009, 12:59 PM   #2
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I am a total novice, and can offer no answers, but since no one has replied, I will offer my observations.

I am curious about the PW and Spark graphs.

Based on the PW, it looks like you start off extremely rich (17), and then drops off to reasonable values (3.3). Could the issue be in the cranking settings?

The spark graph suggests it started at 37, and ended up at 10. That just seems odd to me. Also, I am curious what caused the 2nd spike in the spark? Was there a drastic change in the TP or MAP? I am guessing that the drop in spark angle between the two spikes is what caused the lean spike (i.e. you didn't burn the fuel).

Hope this helps!
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Old 08-16-2009, 01:51 PM   #3
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One other thought:

Did you check the base timings of both cars to verify that they are set to the same values.

Last edited by John151; 08-16-2009 at 02:13 PM.
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Old 06-25-2010, 10:17 PM   #4
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Did you ever figure this out? Mine is having the same symptoms. I'm on a 1.8l though. 1350rpm idle and nothing seems to change it's mind about wanting to stay there.
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