I have a 2002 TDI Golf with 165,000+ miles on it. Engine light came on last week - unfortunately it happened while my wife was driving, so I didn't have the chance to notice anything going on. Wife did mention a lack of power.
Used the VCDS and got code P1556. Read up on the various forms of limp mode. Checked the MAF and that doesn't seem to be an issue. Checked out the MAP, and I think this is the problem. The actual MAP never reaches or exceeds the specified value. (I would include a graph, but my only windows computer is ridiculously old and doesn't network)
Took it out myself and there's a stutter/flat spot around 1900-2100 rpm in 3rd, 4th, and 5th. Accompanied by some black smoke out the back. Engine light is off, after being cleared.
Checked the vacuum lines with a Mityvac. Not sure how effective this was, but I didn't see/hear/feel any leaks. Swapped EGR for N75 and no issues (except for a fault code for N75 ground).
However, the line into the actuator wasn't holding vacuum. Tried moving on my own, but no luck. Had the wife turn the car on while I looked at the actuator and saw no movement. Tried spraying with PB blaster, but no movement still.
I'm guessing next step is to take off the actuator and try cleaning it out before replacing if need be. I'm wondering if I don't have a clutch issue though, as the stutter around 2000 rpm doesn't happen in neutral, 1st or 2nd.
Any thoughts?
Used the VCDS and got code P1556. Read up on the various forms of limp mode. Checked the MAF and that doesn't seem to be an issue. Checked out the MAP, and I think this is the problem. The actual MAP never reaches or exceeds the specified value. (I would include a graph, but my only windows computer is ridiculously old and doesn't network)
Took it out myself and there's a stutter/flat spot around 1900-2100 rpm in 3rd, 4th, and 5th. Accompanied by some black smoke out the back. Engine light is off, after being cleared.
Checked the vacuum lines with a Mityvac. Not sure how effective this was, but I didn't see/hear/feel any leaks. Swapped EGR for N75 and no issues (except for a fault code for N75 ground).
However, the line into the actuator wasn't holding vacuum. Tried moving on my own, but no luck. Had the wife turn the car on while I looked at the actuator and saw no movement. Tried spraying with PB blaster, but no movement still.
I'm guessing next step is to take off the actuator and try cleaning it out before replacing if need be. I'm wondering if I don't have a clutch issue though, as the stutter around 2000 rpm doesn't happen in neutral, 1st or 2nd.
Any thoughts?