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Offline Chi-town

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Idle surge 93 5 cylinders. 5 speed
« on: September 24, 2017, 12:48:00 PM »
So my 93 has a weird issue where if you're sitting idling and rev the engine the idle will jump up and down between 1500-2000rpm till the fans kick on and then it'll settle down to 875rpm.

This also happens when driving. If you just push in the clutch when coming to a stop the idle will start bouncing from 1500-2000rpm. If you down shift and get the rpms below 1200 it'll idle normally.

New VDO idle valve and no vacuum leaks.

Any ideas?

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Offline audios

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    • cardigan mtn orchard
Re: Idle surge 93 5 cylinders. 5 speed
« Reply #1 on: December 05, 2017, 07:13:23 PM »
high idle switch?