tomhasana2
New Member
Hi all,
I purchased a 1.4tdi 75 A2 (2004) in August last year, and since purchase it has had a problem with unintended acceleration which I wonder if you may have any ideas on?
The car drives okay below 2,000rpm and under moderate acceleration everything is okay. But when pushed hard into boost around 3,000rpm, when releasing the accelerator pedal, the engine will continue to accelerate on its own in most gears (but not 1st gear).
Sometimes this acceleration is very jerky on/off (especially noticeable in 3rd gear), if in 5th gear it will just continue to drive as though it has some mysterious cruise control for 300 yards or so before then shutting off the fuel and engine braking (there is no cruise control on this car).
Sometimes when clutch is pushed in when this happens, the acceleration will climb for 500rpm further, then go back to idle.
Sometimes if revs are high, around 4,000rpm and clutch pushed in, the revs will just climb to redline and hold there.
Occasionally the car will also accelerate itself below 2,000rpm but this is less often.
I have found that when the car accelerates on its own, braking when in gear will eventually stop the acceleration.
The car idles perfectly, and when this acceleration issue isn't happening, it will drive exactly as a 75 should.
The car is showing a realtime MPG reading when the unintended acceleration is happening.
The car has 155,000 and I don't believe anything other than standard servicing has been carried out.
Any ideas on what you think may be causing this would be greatly appreciated.
It has been smoke tested at Stealth Racing and no leaks noticed (but doesn't necessarily mean there aren't any tiny leaks that can't be seen).
I have replaced the N75 vacuum solenoid but this did nothing to improve the issue.
Thanks in advance for any replies.
All the best,
Tom (has an A2)
I purchased a 1.4tdi 75 A2 (2004) in August last year, and since purchase it has had a problem with unintended acceleration which I wonder if you may have any ideas on?
The car drives okay below 2,000rpm and under moderate acceleration everything is okay. But when pushed hard into boost around 3,000rpm, when releasing the accelerator pedal, the engine will continue to accelerate on its own in most gears (but not 1st gear).
Sometimes this acceleration is very jerky on/off (especially noticeable in 3rd gear), if in 5th gear it will just continue to drive as though it has some mysterious cruise control for 300 yards or so before then shutting off the fuel and engine braking (there is no cruise control on this car).
Sometimes when clutch is pushed in when this happens, the acceleration will climb for 500rpm further, then go back to idle.
Sometimes if revs are high, around 4,000rpm and clutch pushed in, the revs will just climb to redline and hold there.
Occasionally the car will also accelerate itself below 2,000rpm but this is less often.
I have found that when the car accelerates on its own, braking when in gear will eventually stop the acceleration.
The car idles perfectly, and when this acceleration issue isn't happening, it will drive exactly as a 75 should.
The car is showing a realtime MPG reading when the unintended acceleration is happening.
The car has 155,000 and I don't believe anything other than standard servicing has been carried out.
Any ideas on what you think may be causing this would be greatly appreciated.
It has been smoke tested at Stealth Racing and no leaks noticed (but doesn't necessarily mean there aren't any tiny leaks that can't be seen).
I have replaced the N75 vacuum solenoid but this did nothing to improve the issue.
Thanks in advance for any replies.
All the best,
Tom (has an A2)