| Subject: | '90 Plymouth Laser Turbo |
| Question: | Car fluctuates at idle
900-1400rpm. Runs fine with air conditioner on. Installed used idle
speed motor, did not address the problem. Any clues? |
| Answer: | Jay, The idle surge you are describing typically is caused by the idle speed control motor (ISC). If you want to try some other tests of your ISC or surrounding components that might be causing your idle surge, check this web page: http://www.vfaq.com/FAQlocator-intake.html It may be possible you have a leak from a dried up O-ring used for your
base idle setting screw (BISS). The web page I provided should give good
details to check all possible causes. |