Engine Performance problem
2003 Other Jeep Models 6 cyl Four Wheel Drive Automatic 122000 miles
When the jeep is started in cold weather it will make a slight knocking noise until the coolant temp hits around 180. After it warms up the noise goes away. Then the jeep idles rough when in drive, but not so much when in park or neutral. I have noticed recently a faint noise when accelerating that sounds like something vibrating in the glove box, but there is nothing in there. So far I have changed the spark plugs, 02 sensors, checked all vacuum lines, cleaned the throttle body, cleaned idle speed motor, hooked the car up to a scan tool (no error codes). I have put a tank full of mid grade fuel in and it seemed to reduce the engine noise but my performance has not improved. During this time my mpg has dropped from 25-27 to 19-22. Please help.
have the same problem?
Sunday, December 7th, 2008 AT 11:57 AM