Question about 2003 GMC Yukon XL
I had dye ran through my system and no obvious leaks found. After charging, there was a distinct smell inside the vehicle. Freon lasted less than hrs. Also the computer ran codes that indicated the knock sensors need to be replaced. My reduced engine power kicks on now almost every time I try to drive it oppose to every couple months. I also seem to be losing gas mileage. One owner,myself; 260,000 miles. Until I can further indicate problems, Its parked!!!
I would say your a/c evaporator may be the culprit for your leak. What code did it give you for the knock sensor replacement? I would give it a tune up if it has been awhile.
Posted on Apr 23, 2013
Testimonial: "Not sure what the codes are specifically. I had the shop run it on the computer. Tune up is current. Could the knock sensor code cause the reduce engine power? Also in a Yukon to get to the evaporator, does that intel pulling the seats and console? Whats the estimated cost in regards to the evaporator work?"
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Posted on Jan 02, 2017
SOURCE: 2006 Envoy fuel sensor failure
the sending unit for the gas gauge is in the fuel tank and part of the fule pump module, it is not sold seperately. price around $350.00, 2 hours labor to install the part. see photo
Posted on Apr 15, 2009
Likely the O2 sensor is seeing an overly rich fuel mixture and since it's beyond its range it is throwing a code. I don't remember ever seeing an O2 sensor shut off the engine. I'd look over the fuel pressure regulator temp sender and throttle position sensor. Possible one of those is sending mis-information and causing rich condition. There are other items that can do this as well but only go there if you strike out with what I suggested.
Posted on Jun 19, 2009
Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.
Posted on Jan 20, 2010
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