roboblazer Posted May 21, 2009 Report Share Posted May 21, 2009 The car is 98 deville 130k, It is throwing up the service idle control warning, but it does not throw a code. I have notice a drop in my mpg since it started. I have cleaned the throttle body, idle air sensor , and the egr valve with no help. Please someone point me in the right direction, I am clueless at this point Link to comment Share on other sites More sharing options...
Dave in Texas Posted May 21, 2009 Report Share Posted May 21, 2009 Faulty MAF sensor or faulty TPS bad/misadjusted. Vacuum leak. Codes should be present, but I have heard of codes not displaying with the cars system but do display on a scanner..... GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
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