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Discussion Starter · #1 ·
My girlfriend has a 1999.5 Jetta with the VR6. Her car had a check engine light on for a few months but didn't do anything about it because the car was running fine. Once in awhile she would also get the EPC light but it would go out after a short time. Suddenly it started losing power and running poorly. I found this forum and bought a vag-com, but I am new to VW's so I need your help. I hooked up the vag-com and here is what I got.
13 Faults Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-10 - - - Intermittent
16706 - Engine Speed Sensor (G28): No Signal
P0322 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16685 - Cylinder 1 Misfire Detected
P0301 - 35-10 - - - Intermittent
16689 - Cylinder 5 Misfire Detected
P0305 - 35-10 - - - Intermittent
16690 - Cylinder 6 Misfire Detected
P0306 - 35-10 - - - Intermittent
16686 - Cylinder 2 Misfire Detected
P0302 - 35-10 - - - Intermittent
17950 - Angle Sensor 1 for Throttle Actuator (G187): Implausible Signal
P1542 - 35-10 - - - Intermittent
17950 - Angle Sensor 1 for Throttle Actuator (G187): Implausible Signal
P1542 - 35-10 - - - Intermittent
17579 - Angle Sensor 2 for Throttle Actuator (G188) Implausible Signal
P1171 - 35-10 - - - Intermittent
16804 - Catalyst System: Bank 1: Efficiency Below Threshold
P0420 - 35-00 - -
17967 - Throttle Valve Control part (J338): Fault in basic settings
P1559 - 35-10 - - - Intermittent
17953 - Throttle Valve Controller: Malfunction
P1545 - 35-10 - - - Intermittent

I replaced the maf (just the sensor from the 2.0) and cleared the codes. The check engine light has disappeared but the EPC light still comes on most all the time. Around 2800 rpm's the engine bogs and doesn't run well at rpm's above that point. It runs well at low rpm's and the EPC will disappear if you keep the revs under 2800. I drove the car for about 20 miles and ran the vag-com again...
1 fault found:
16706 -Engine Speed Sensor (G28): No Signal
P0322-35-10---Intermittent
Now I'm stuck. Any ideas?
 

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Discussion Starter · #6 ·
Re: (ROCKnRLR)

Quote, originally posted by ROCKnRLR »
You seem to have a bad engine speed sensor, and a bad throttle body. The TB is VERY expensive.

Would a bad engine speed sensor trigger the epc light and the cause the symptoms that I've described? Could the codes from the throttle body have been triggered by the bad maf sensor? Is there any way I can diagnose this further instead of just throwing parts at it?
 

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Discussion Starter · #7 ·
Re: (1995 LT1)

Ok, after some more driving I am still getting the EPC light and the car drives poorly over 2800 rpm's. The check engine light came on again so I scanned it again and the only code I am getting is the engine speed sensor. My CD from Bentley is on backorder. Can anyone help me out with this sensor? Part #? Where is it?
 

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Re: (B_TitusJr)

I would say that the engine speed sensor has nothing to do with the bogginess of the engine. In the first list of codes it said a couple misfires were happening. Now they aren't pulling up on the vag-com. That doesn't make sense to me. Maybe a short in one of the injectors/spark plug system on those cylinders. The engine light doesn't come on right away if a fault is found. It has to occur several times repeatedly for the car to throw an engine code. You are definitley running into some misfiring somewhere which would explain the engine running poorly. If all the cylinders are not firing correctly then you would lose some power to the engine, which is what it sounds like is happening. I would take it to a trusted mechanic if this is something you don't feel comfortable working on. Good luck.
 
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