I've got a 1998 VW Jetta GLX (VR6) with 5 speed and with 117k miles. I have two issues that may or may not be related:
-unusually high idle rpm: hovers around 1100-1200rpm where 700 was the norm in the past. Also, the idle rpms are not as steady and fluctuate a bit more than they used to.
-after driving on a highway for about an hour, found that the car would intermittently jerk (loose power?) for a second or two. This comes and goes in small batches and can happen at any gear. The jerking is a lot more severe than if I abrubtly let gas pedal off which makes me think that it's not engine related. If I abrubtly let gas pedal off in any gear, the car slows down relatively smoothly as it should. No stalling has occured yet (crossing my fingers).
-Here are my trouble codes:
P0103 Mass or Volume Air Flow Circuit High Input
P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
P0442 Evaporative Emission Control System Leak Detected (Small Leak)
P1544 Throttle Actuation Potentiometer Signal too High
P1580 Throttle Actuator B1 Malfunction
P1582 Idle Adaptation at Limit
-I took the throttle off to check it and all mechanisms are in good shape even the gears and potentiometer.
-AMF sensor is responsive to throttle position changes
-throttle pos. sensor is responsive to pedal pressing (as seen in my scanner)
-Fuel filter is one year old, air filter is clean
-new spark plugs
-unusually high idle rpm: hovers around 1100-1200rpm where 700 was the norm in the past. Also, the idle rpms are not as steady and fluctuate a bit more than they used to.
-after driving on a highway for about an hour, found that the car would intermittently jerk (loose power?) for a second or two. This comes and goes in small batches and can happen at any gear. The jerking is a lot more severe than if I abrubtly let gas pedal off which makes me think that it's not engine related. If I abrubtly let gas pedal off in any gear, the car slows down relatively smoothly as it should. No stalling has occured yet (crossing my fingers).
-Here are my trouble codes:
P0103 Mass or Volume Air Flow Circuit High Input
P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
P0442 Evaporative Emission Control System Leak Detected (Small Leak)
P1544 Throttle Actuation Potentiometer Signal too High
P1580 Throttle Actuator B1 Malfunction
P1582 Idle Adaptation at Limit
-I took the throttle off to check it and all mechanisms are in good shape even the gears and potentiometer.
-AMF sensor is responsive to throttle position changes
-throttle pos. sensor is responsive to pedal pressing (as seen in my scanner)
-Fuel filter is one year old, air filter is clean
-new spark plugs
Sep 14, 2006 at 5:45 PM