Engine Performance problem
2001 Hyundai Sonata 6 cyl Two Wheel Drive Automatic 98,000 miles
The sonata revs up to 4000 rpm once it is at operating temperature. Then it goes up & down repeatedly. It doesn't matter if you are in neutral or park. When driving, sometimes it runs at 40 mph without your foot on the gas at all. Temporarily breaking does not reset the speed. It also surges when auto trans is shifting gears like the trans is slipping a little. I do get a code that says large vacuum leak. I have replaced the 2 front 02 sensors, EVAP canister purge solenoid valve and the trans axle range switch. We still have the same problem. Could it be the EVAP canister in the back of the car that needs replacing? Any suggestions?
Saturday, October 3rd, 2009 AT 7:20 PM