Engine Performance problem
2004 GMC Envoy V8 Two Wheel Drive Automatic 81000 miles
I took in my car for an inspection and it failed. The inspector said my knock sensor shows a low, or no, voltage reading, and when this happens the emissions test cannot run. The engine has always run fine, and my gas mileage has been consistent (380-400 miles per tank for 5 years now). I took the vehicle to a mechanic, he plugged in his computer equipment to check the error codes, same thing. He said the sensor is inside the engine, meaning he'd have to remove to intake manifold. Cost to repair is $800-$1000. Ugh.
I bought a Chilton's manual to read up on this and he was right, it appears the sensor for my year-2004 5.3L V-8 is in fact inside the engine. I saw in the manual there are 2 sensors. If the engine continues to run at the same level it did when I drove it off the lot, why does the sensor matter? Also, is there a way to bypass the sensor so that the error code doesn't get thrown when the system is tested?
have the same problem?
Sunday, March 15th, 2009 AT 1:02 PM