chasw7
14-03-2007, 11:47 AM
Hello forum,
I recently experienced loss of power in my 1.8t at various random points throughout the rev range. At approx 2200rpm, 3800rpm and 4100rpm the power just seemed to be showing huge flat spots. I told Volkswagen, Edinburgh Fort Kinnaird, which they then tried to diagnose.
After time in there garage, they told me to replace the coolant temp sensor/switch. I did this at my local garage to save costs, no change in the symptoms.
I went back to VW and they admitted a mistake, that they forgot to tell me of various faults when my ecu was checked - huge blunder which they have now rectified/refunded after various phone calls and meetings. The faults were:
P1200 - Recirculating valve for turbocharger - N249: mechanical malfunction
P1297 - Connection charger throttle valve - Pressure drop
I also had a diagnostics machine plug into my car at various other garages which all came back with,
P1200 - recirculating valve. Unfortunatley these machines also told me of another fault which the volkwsagen diagnostics machine did not pick up.
P1128 - Bank 1 mixture adaption (mult):system too lean.
I have been told by my local mechanic at John Hastie and Son of Prestonpans (A reputable garage which I trust a hell of a lot more than official VW at Fort Kinnaird), that the Bank 1 P1128 fault is an o2 sensor.
I have changed the recirculating valve for a brand new one, however the problem still exists, and, if anything, has become worse!! I have not replaced the o2 sensor yet purely because the official VW diag machine did not pick up the fault.
Any help at all would be very much appreciated. I have read pages and pages on these faults but I cannot come to any conclusion. I now need a true VW turbo expert!
The car is booked in at VW Fort Kinnaird Edinburgh for Thursday 15 March for a two hour diagnostics check/test. I sure hope they can diagnose the problem after another two hours working on my car. It would be nice to take some information to the mechanics at VW regarding this problem. Any help, info or resolved troubles in the past regarding this problem, please post here!!!!!! This car is costing me an arm and a leg. I got a VW because I wanted an affordable but well built car! Im not sure I have done the right thing getting a VW.......
Cheers,
Chas W
p.s The car idles very rough, and sometimes chooses to idle at 600rpm, other times it idles at 1200rpm on cold startup then drops to 800rpm when warm.
When the car is static, but running, you can feel a slight rough shudder in the car when reving between 2000rpm and 3200rpm.....very weird minging vibration!
The exhaust emmission light comes on the dash board approx 5hours after all fault codes have been wiped from the ecu. Could this suggest something to do with that bank1 o2 sensor?? Could this affect fuel mixtures? therefore the engine is running too lean, as stated by the ecu fault code? If so, why didnt the official VW machine pick up this fault?????
I recently experienced loss of power in my 1.8t at various random points throughout the rev range. At approx 2200rpm, 3800rpm and 4100rpm the power just seemed to be showing huge flat spots. I told Volkswagen, Edinburgh Fort Kinnaird, which they then tried to diagnose.
After time in there garage, they told me to replace the coolant temp sensor/switch. I did this at my local garage to save costs, no change in the symptoms.
I went back to VW and they admitted a mistake, that they forgot to tell me of various faults when my ecu was checked - huge blunder which they have now rectified/refunded after various phone calls and meetings. The faults were:
P1200 - Recirculating valve for turbocharger - N249: mechanical malfunction
P1297 - Connection charger throttle valve - Pressure drop
I also had a diagnostics machine plug into my car at various other garages which all came back with,
P1200 - recirculating valve. Unfortunatley these machines also told me of another fault which the volkwsagen diagnostics machine did not pick up.
P1128 - Bank 1 mixture adaption (mult):system too lean.
I have been told by my local mechanic at John Hastie and Son of Prestonpans (A reputable garage which I trust a hell of a lot more than official VW at Fort Kinnaird), that the Bank 1 P1128 fault is an o2 sensor.
I have changed the recirculating valve for a brand new one, however the problem still exists, and, if anything, has become worse!! I have not replaced the o2 sensor yet purely because the official VW diag machine did not pick up the fault.
Any help at all would be very much appreciated. I have read pages and pages on these faults but I cannot come to any conclusion. I now need a true VW turbo expert!
The car is booked in at VW Fort Kinnaird Edinburgh for Thursday 15 March for a two hour diagnostics check/test. I sure hope they can diagnose the problem after another two hours working on my car. It would be nice to take some information to the mechanics at VW regarding this problem. Any help, info or resolved troubles in the past regarding this problem, please post here!!!!!! This car is costing me an arm and a leg. I got a VW because I wanted an affordable but well built car! Im not sure I have done the right thing getting a VW.......
Cheers,
Chas W
p.s The car idles very rough, and sometimes chooses to idle at 600rpm, other times it idles at 1200rpm on cold startup then drops to 800rpm when warm.
When the car is static, but running, you can feel a slight rough shudder in the car when reving between 2000rpm and 3200rpm.....very weird minging vibration!
The exhaust emmission light comes on the dash board approx 5hours after all fault codes have been wiped from the ecu. Could this suggest something to do with that bank1 o2 sensor?? Could this affect fuel mixtures? therefore the engine is running too lean, as stated by the ecu fault code? If so, why didnt the official VW machine pick up this fault?????