Throttle Position Sensor

[DJP16]

A while ago my VT series 1 exec was having a casual problem where it would begin to idle higher than usual (1,000rpm) when coming to a stop, and then move to 1,800rpm when I put it in neutral.... so every few days I would have to pull over and turn off the car in drive, then let it rest for a sec, turn it back on (sometimes would hear a loud pop in the engine bay) and then it would be fine until next time.

After a few months of this (since the mechanic couldn't find out why it was happening, but suspected the TPS), the TPS finally gave way and I got it replaced. NOW a few months after this, it occasionally happens about once a fortnight, maybe once a week. There's just no pattern to it.

Would it possibly be a wiring problem to the TPS, or could there by another underlying cause that won't show itself?

Thanks

[Mirkz]

Perhaps also look into Idle Air Control (IAC) Valve.

I had an issue where mine was doing it randomly when I was stopped at lights etc and idling, would increase revs etc.
Now that I've replaced it, it'll only usually rev once up a little and then settle back down if the car is in park and idling for a while.

[acarmody]

Also ensure there is a bit of slack on the accelerator cable. There is really piss all difference in butterfly movement, for 1000rpm difference in neutral.

Also look and see if there is carbon build-up blocking the butterfly from closing properly.

[EDGE3]

When you replaced the TPS did you clean everything really good,if not then all the gunk thats still inside could be stuck to the new TPS.

[DJP16]

Hmmm I'll check that out tomorrow EDGE3, It was a very quick job as I had work soon after lol.

Butterfly seems clean, I'll check the IAC too. Thanks for the quick responses everyone!