Car is surging at idle
08-15-2009, 04:36 PM
#1
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Car is surging at idle Okay this car has been haunting me for weeks now and I dont know what it wants.
Symptoms:
After a cold start it runs fine I wait till it comes to temperature drive it around do 5 to 10 0 to 70 runs and it runs tip top then I bring it home and shut it off. Two hours or so later I start it up and it idles fine for about 10 seconds then it starts revving from 500 to 2000 or 3000 and back down.
New Parts:
Optispark, IAC, TPS, coil, ICM, plugs and wires, pcv tube, pcv grommet, evap vacuum line, o2 sensors.
I dont see or hear anywhere else there would be a vacuum leak and the fuel pressure is right where it should be. I tried it with and without the MAF plugged in.
Please advise before I just put it in a field and shoot at it.
Symptoms:
After a cold start it runs fine I wait till it comes to temperature drive it around do 5 to 10 0 to 70 runs and it runs tip top then I bring it home and shut it off. Two hours or so later I start it up and it idles fine for about 10 seconds then it starts revving from 500 to 2000 or 3000 and back down.
New Parts:
Optispark, IAC, TPS, coil, ICM, plugs and wires, pcv tube, pcv grommet, evap vacuum line, o2 sensors.
I dont see or hear anywhere else there would be a vacuum leak and the fuel pressure is right where it should be. I tried it with and without the MAF plugged in.
Please advise before I just put it in a field and shoot at it.
08-17-2009, 08:24 AM
#4
I dont think i have any spare oxen from the 93. I'd say lets try and get a datalog, I have a Moates cable for my 93, not sure if it'll work on your 94, may want to look in to that. But if it will, down load a free copy of TTS data masters and we can data log it when I get home mid next week. Atleast then you'll be able to see LT1 life in the eyes of the PCM and you wont be throwing cash at it like a stripper.
Last edited by BizZzatch350; 08-17-2009 at 08:30 AM.
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08-18-2009, 08:14 PM
#8
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mine does the same exact thing
i had mine tuned up sat and it drove fine, then as soon as it heated up to 180 it would surge at idle from 500 to 1000
i figured it would be a vacuum line, because i hear my cai sucking for air
just my 2 cents
i had mine tuned up sat and it drove fine, then as soon as it heated up to 180 it would surge at idle from 500 to 1000
i figured it would be a vacuum line, because i hear my cai sucking for air
just my 2 cents
08-24-2009, 04:26 PM
#12
Staging Lane
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It was just loose from the headers not finger loose or anything I just tightened it till it could not be tightened anymore and the problem went away.
