majbarron Posted April 8, 2011 Report Share Posted April 8, 2011 My 98 sls is idling high, its not happening all the time, maybe once every 3 0r 4 days. Please help. Thanks Link to comment Share on other sites More sharing options...
cadillacjeff7777 Posted April 8, 2011 Report Share Posted April 8, 2011 Do you get any codes? Check the ISC motor. 2008 DTS Link to comment Share on other sites More sharing options...
Ranger Posted April 9, 2011 Report Share Posted April 9, 2011 The '98 does not have an ISC motor. The idle is controlled by the IAC valve. When was the TB last cleaned? Link to comment Share on other sites More sharing options...
rockfangd Posted April 12, 2011 Report Share Posted April 12, 2011 also could be the ecm coolant temp sensor being faulty. will cause rich and or lean conditions and raised idle. Have you pulled any codes? GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
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