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1990 240- Lots of repairs now high and surging idle- Help! 200

posted by  rice240 on  Tue Jan 11 11:28 CST 2022
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last visit: Tue Aug 26 10:51 CST 2014
[RELATED]

I had a intake gasket blowout on cylinder 1 that I apparently had been there a while, so I decided to do all of the usual maintenance while I had the intake manifold off. Clean Throttle body, clean IAC, replace vacuum lines, new PCV, plus, and new FPR. New gaskets for IM and TB. I did remove the fuel rail as well. I did take off the Throttle Position Sensor to clean the throttle body well and I took photos and marked where the position was.

I got it all back together, fired right up but idled at about 2000rpm. Later it started surging every 2 seconds or so and stayed like that. I rechecked as much as a could but I cannot figure out what is going on. I unplugged the TPS and it ran like crap so it is working I suppose. I might have a small vacuum leak at cylinder three fuel injector maybe. What should I do next? I appreciate your help.






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