Barcourse Posted June 10, 2003 Report Share Posted June 10, 2003 Vehicle is running at 50-65 mph on highway. I take my foot off the gas pedal to let the car slow down. 'Service engine soon' warning light comes on and stays on for along time. No perceptible effect on engine. Behaving this way for 3 years! Have tried to fix it. Can't diagnose cause. Any ideas? Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted June 10, 2003 Report Share Posted June 10, 2003 what motor/trans. and have you run the codes?? Robby Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted June 10, 2003 Report Share Posted June 10, 2003 If it's when you let off the gas, sounds like an EGR failure / problem. However, to get what the ECM is reading, check this: OBDI ECM Codes Let us know what code and we'll go from there! - RedFox340 Quote Link to comment Share on other sites More sharing options...
slick Posted June 10, 2003 Report Share Posted June 10, 2003 I had that problem when i had my beretta with the 3100. I ran the codes, said egr, but it didn't have the problems the egr would create. We replaced it anyways, same problem. Finally got it into a shop, they ran a vacuum test, and the intake manifolds were all carboned up. They cleaned them out, and after that, no problems. Quote Link to comment Share on other sites More sharing options...
luminator94 Posted June 10, 2003 Report Share Posted June 10, 2003 Once upon a time when I had my Dodge Dynasty, when I would accelerate over 45mph, then drop back down below 45mph, it would cause the Check Engine light to come on. Turned out to be a bad MAP sensor, which I don't even know if your car has one or not. Aaron Quote Link to comment Share on other sites More sharing options...
JS91Z34 Posted June 10, 2003 Report Share Posted June 10, 2003 If it's when you let off the gas, sounds like an EGR failure / problem.However, to get what the ECM is reading, check this: OBDI ECM Codes Let us know what code and we'll go from there! - RedFox340 Mine did the same thing until that light burned out! problem solved!! Quote Link to comment Share on other sites More sharing options...
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