Idle all screwed up
04-02-2009, 09:57 PM
#1
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Idle all screwed up
When I first started up the car running MS, it idled just fine. After my little no start issue, now it idles around 1200-1400 and moves up and down between those numbers. When it revs up to 1400, the car misfires and the rpm's drop back down to 1200, etc. Also, on cold startup the car revs up to 2800 and stays there for a couple minutes. How do I fix these things? Under idle control, cold idle is set at 1400 but it seems to want to double that.
Car drives fine down the road, no issues there. If someone can take a look at this MSQ and yell at me that would be great.
Car drives fine down the road, no issues there. If someone can take a look at this MSQ and yell at me that would be great.
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04-02-2009, 11:09 PM
#8
yeah, N/A NA
EDIT: shouldn't make a difference, and we're running the same injectors. Only difference I see is that you are running variable throttle position sensor accel enrichments. I won't be doing that until next week
EDIT: shouldn't make a difference, and we're running the same injectors. Only difference I see is that you are running variable throttle position sensor accel enrichments. I won't be doing that until next week
Last edited by gospeed81; 04-02-2009 at 11:21 PM.
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04-03-2009, 08:45 AM
#12
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Not necessarily - it needs to be set so the basic trigger angle is between 50 and 89 degrees and the timing matches, but you can accomplish that with or without the trigger angle addition on most Miatas depending on the factory CAS tolerances. You will need to be sure your base timing is correct.
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04-03-2009, 08:53 AM
#13
Ok, understood.
So if I took the trigger addition off, mine, at 56 degrees trigger angle, would still fall in that range at 78.5 degrees.
I assumed above that he was basicaly compensating for having no trigger angle addition.
So what about the idle settings?
He has basically nothing setup there in his .msq.
So if I took the trigger addition off, mine, at 56 degrees trigger angle, would still fall in that range at 78.5 degrees.
I assumed above that he was basicaly compensating for having no trigger angle addition.
So what about the idle settings?
He has basically nothing setup there in his .msq.
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04-03-2009, 08:39 PM
#16
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Ok, took the car out for a drive. The misfire at idle is gone, but it will not idle any lower than 1100-1200. Definitely idles better though. Finally got a few pulls near redline @ 12psi and the AFR is in the 11.8~12.2 range. So I will be sure to add some fuel up top.
First drags of the season are in two weeks, so gotta get it tuned enough for that. Seem to be on the right track.
Thanks for the help guys, and any more insight into the idle thing would be great. 
First drags of the season are in two weeks, so gotta get it tuned enough for that. Seem to be on the right track.
Thanks for the help guys, and any more insight into the idle thing would be great.
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04-05-2009, 07:09 PM
#17
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Ok, so I switched to gospeed's map, imported my spark and fuel tables, changed the spark settings back to mine, and the car idles great now. However, after shifting the car bogs and it doesn't like boost at all, so I have a few things left to do. 
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04-06-2009, 10:52 AM
#19
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I know that, hadn't really driven it but around the block, and barely went into boost but a tiny bit, which it didn't like. (knew it wouldn't) I did spend some time last night swapping over some of my boost settings, but the car didn't want to idle this morning for some reason, so I switched back to my old msq with the bouncy idle. Boing...Boing...
Oy.
Oy.
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