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Old 04-30-2021, 10:37 PM   #1
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Join Date: Sep 2014
Location: Omaha
Default 1988 Volvo 240 - Surging Idle

I just changed the coolant temp sensor (fuel injection sensor) and the coolant temp sender sensor. I had a constant idle of 1500 rpm regardless of whether the engine was cold or warm and my temp gauge was not working.

I removed the intake manifold and cleaned the TB and replaced gaskets. After I put it all together, it surges terribly at idle, going to to 1500-2000 rpm and dropping until it almost dies and up again. Each interval lasts about 2-3 seconds. I do not understand what is happening. I checked all the hoses, sensors, and grounds I undid, and I didn't miss any. I did mess up the ignition coil wire (the wire came out of the boot on the distributor end; I can stick it back in, but I don't think it should be that way). What should I be looking at? Bad IAC all of a sudden? Bad TPS (it seems adjusted correctly)?
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