TVR Tuscan keeps revving and won't stop?
Discussion
Amy does it do this with the throttle fully closed ? i would check the voltages from your throttle pots should get 0-5Vdc approx from the pots from fully closed to fully open ign on engine not running or check resistance of pots end to end. If one of the pots is open circuit at the ground end it will feed 5V to the ecu so the ecu thinks its at full throttle. Surprised there is enough air if the throttles are closed though.
Ian
Ian
Amy,
I'd agree with last poster.
Best way to check throttle linkage is to remove both halves of airbox to expose the throttle bodies and throttle cable/linkages .
Have someone depress accelerator pedal and check smoothness. As last poster states, if throttle butterflies are not open then the engine should not rev...even if throttle pots are sending an erroneous signal to ecu...you must have air to burn the fuel!!
The throttle cable end clamp can jam under the bracket and hold the butterflies open/prevent them closing. This happened to my car - I just turned the clamp so that it was not jamming anywhere.
Nick
I'd agree with last poster.
Best way to check throttle linkage is to remove both halves of airbox to expose the throttle bodies and throttle cable/linkages .
Have someone depress accelerator pedal and check smoothness. As last poster states, if throttle butterflies are not open then the engine should not rev...even if throttle pots are sending an erroneous signal to ecu...you must have air to burn the fuel!!
The throttle cable end clamp can jam under the bracket and hold the butterflies open/prevent them closing. This happened to my car - I just turned the clamp so that it was not jamming anywhere.
Nick
Hi
Thank you for your replies. It does seem to be indicating that it is the throttle pods that are at fault. It is by luck that i do have some second hand spare ones which I think are ok. I have no idea.....is it ok to just disconnect them and put the new ones on or have i got to set them up with the ecu? Can anybody advise? I assume i can just unbolt them and plug the new ones in but i am going to put a meter on and check the voltage reading.
Kind regards
Amy
Thank you for your replies. It does seem to be indicating that it is the throttle pods that are at fault. It is by luck that i do have some second hand spare ones which I think are ok. I have no idea.....is it ok to just disconnect them and put the new ones on or have i got to set them up with the ecu? Can anybody advise? I assume i can just unbolt them and plug the new ones in but i am going to put a meter on and check the voltage reading.
Kind regards
Amy
I wondered if it were a special?It is unlikely to be the throttle pots . Something is stopping the throttle closing and my bet would be the pivot bar on the pedal box is bent . The arm that pushes onto the servo is on the middle of the bar and is unsupported and if it bends it interferes with the pivot of the throttle arm.
If you've not driven your Tuscan for a while, the bushings of the pivot shaft in your pedal box can get a bit corroded and stop the throttle returning to idle position.
I have had this problem on both of my Tuscans when they have been stood a while.
With the engine running, hook your foot behind the pedal and see if the revs drop back.
If it is this problem you can free the pedal up by simply pumping the pedal for a while but with the engine off.
Good luck,
Tony.
I have had this problem on both of my Tuscans when they have been stood a while.
With the engine running, hook your foot behind the pedal and see if the revs drop back.
If it is this problem you can free the pedal up by simply pumping the pedal for a while but with the engine off.
Good luck,
Tony.
Gassing Station | Tuscan | Top of Page | What's New | My Stuff