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12-14-2003
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#1 |
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Join Date: Dec 2003
Posts: 491
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Surging at idle
I have a 92 ZR1 with a doug rippee chip & 3inch B&B. My car cycles the idle between 1000rpms & 1200 rpms. it is really annoying. Any suggestions?
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12-14-2003
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#2 |
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Join Date: Dec 2003
Posts: 491
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It could be a number of things but I would check and clean the IAC valve on the side of the throttle body and would also clean the back of the throttle body plates.
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12-14-2003
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#3 |
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Join Date: Dec 2003
Posts: 491
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Had a same problem once, it turned out to be oil in the hose and MAP sensor that was causing the surge at idle. I took it apart and cleaned it out with carb cleaner, it has worked fine ever since.
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12-14-2003
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#4 |
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Join Date: Dec 2003
Posts: 491
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Thank you for a good starting place, where is the MAP located? I now have a new problem, I just came back from Vets at carlisle & the surging turned into a missing at idel. It also feels like the secondaries are not kicking in It has a real problem getting to 5000 rpms. I changed out the plugs & gapped them at .050. I have checked the vacuum it is okay How do I verify the secondary operation... (I know dumb question) Thanks for your help!!!
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12-14-2003
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#5 |
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Join Date: Dec 2003
Posts: 491
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Map sensor is behind the intake covered by an aluminum plate. check the vacuum hose that connects to it. I bet you have oil in the line and the map can't do what its supposed to do.
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12-14-2003
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#6 |
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Join Date: Dec 2003
Posts: 491
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Thank you for all of your help! it is a team like this that builds America. I will clean out the MAP & IAC tonight. Would the Map make the secondaries not function?
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12-14-2003
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#7 |
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Join Date: Dec 2003
Posts: 491
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The map hose was cracked! I will keep you posted I think it is fixed now I will go hunting tonight.Thanks a million for your help!
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12-14-2003
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#8 |
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Join Date: Dec 2003
Posts: 491
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My problem was 95% fixed by replacing the MAp hose. but my idle surge has again reappeared. My car will idle at 1500rpms when is is rolling then drop to 1000rpms when I stop completly it never goes lower than 1000rpms. At dead stop the idle will cycle between 1000 & 1200 rpms. I am going to remove the plentum this week end to replace the wires & look for anything out of place. Anyother suggestions from the gang out there in ZR1 world?Regards,
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12-14-2003
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#9 |
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Join Date: Dec 2003
Posts: 491
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Possible other problem may be your IAC, it may be dirty and doesnot close all the way due to carbon build up. The IAC is located on the right side of the throttle body. This valve is what controls idle on the engine. Take it off and look for carbon build up. I hope this helps.
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12-14-2003
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#10 |
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Join Date: Dec 2003
Posts: 491
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I have removed it and tried to close it manualy and it will not close. I pulled the plunger out of the housing and the spring came out. I put it back together it still surges. Should this IAC come appart easily?92 zr1
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Linear Mode
