Question about 1991 Buick Regal

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Hey. you responded to my question about the 91 regal acting sluggish the warmer it gets and the longer i drive it in one trip. ive pretty much knocked out the simple stuff. since i have owned it i have taken great care it. i used to work for goodyear. ive done water pump, alternator, belt, transmission fluid exchange and new trans filter. fuel filter, coolant flush, thermostat, rear struts oil change every 2 grand. and i threw a cold air intake on it for the hell of it. i think it could possibly be the intake air temp sensor because it adjusts the way the engine acts to the temp of in comming air. but im not sure. oh btw it has 115,153 ish miles

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An air ambient temp sensor wouldn't have that kind of effect on the engine. I would lean more towards the CTS. Also I would check the vaccum line running into the MAP sensor as well. The mileage doesn't indicate a converter issue.

Posted on Oct 20, 2008


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