Question about 1999 Saturn SL
Either the idle air controller is malfunctioning or the Throttle position is-both are located next to each other on the back (firewall) side of the throttle body. If you remove the air tube from the air leaner, you can remove he throttle body:rotate the throttle bell crank and push the throttle cable out of the crank slot. Unbolt the throttle body (4-12mm bolts I think) and pull the throttle body enough that you can unplug the harnesses. The torx screws that hold the IAC and TPS can now be easily be removed. Clean everything with THROTTLE BODY CLEANER, and do a thorough job-especially the IAC, being careful not to spray the top half becasue it contains electronics that will not like being doused with any fluids. The TPS rarely shows lots of carbon buildup, but since you are there, check it out anyway.
All of this is assuming you do not have a check engine light-your problem is common on these cars and you should also replace the engine coolant sensor regularly on these cars, and the thermostat if the temp gauge is less than 1/4. I have one of these with 178,000 miles, they are great are but need some routine maintenance and a clean throttle body to run properly.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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