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Old 11-28-2014, 07:02 AM   #1
middlegati
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Default s52 idle surges

hey all, my s52 swap idle likes to surge up and down when sitting idle, also when coming to a stop or neutral.. not all the time, but would like to have a smooth idle.. is it icv?
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Old 11-28-2014, 07:10 AM   #2
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My M52 sometimes does this also, although only when coming to a stop in neutral/clutch in. I'd love to hear if you find a solution for this. It seems to happen more when it is cold out (< 40 f)
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Old 11-28-2014, 07:27 AM   #3
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My M52 sometimes does this also, although only when coming to a stop in neutral/clutch in. I'd love to hear if you find a solution for this. It seems to happen more when it is cold out (< 40 f)

haha hopefully i figure it out, i think it may be electrical.. it happens alot more when its cold out aswell, but also when i have my A/C running... use to happen with my m42 aswell.... what year is your car? mine is a 95 obd1 swap
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Old 11-28-2014, 05:02 PM   #4
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Start with the IAC, clean it test it. Then check for any vacuum leaks.
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Old 11-29-2014, 01:20 AM   #5
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Quote:
Originally Posted by M-technik-3 View Post
Start with the IAC, clean it test it. Then check for any vacuum leaks.
IAC??? is this the Idle Control Valve (ICV?)
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Old 11-29-2014, 01:57 AM   #6
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Idle Air Controller or Idle Control Valve. Different terminology
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Old 11-29-2014, 08:12 PM   #7
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haha hopefully i figure it out, i think it may be electrical.. it happens alot more when its cold out aswell, but also when i have my A/C running... use to happen with my m42 aswell.... what year is your car? mine is a 95 obd1 swap
Mine is a 98 with an M52 out of a 97
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Old 11-30-2014, 03:03 PM   #8
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Yes, both of those cars should have IAC/ICV.
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Old 12-04-2014, 09:14 AM   #9
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Check vacuum leaks; I had a bungled o-ring on a sensor on the underside of the intake manifold. I built a smoke machine using a GM diesel glow plug, a 1-qt. paint can and pharmacy glycerine. Hooked it up to the air intake boot and voila -- I easily found the leak and solved the hunting idle.


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Old 12-04-2014, 01:11 PM   #10
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Ditto on the air leak, either the boot between the MAF and throttle or vacuum line.
My S50 has similar idle surge during the transition from cold to warm, when the temp pm gage is just out of the blue. It seems a little lean then, but it's fine when fully warmed up.
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