Originally Posted by RScrew69
do they get dirty and need cleaning up? thats the red box on the side of the throttle body right?
my secs monitor reads 0% on idle, when i blip the throttle it increases in percentage then i let go and it drops back down to 0%
Also when i rev the car and let go of the accelerator pedal it bounces back up and it sounds like its getting a eletrical pulse or something coming through as the revs drop down to bounce back up. then it continues idleing abit hunty kinda thing. its not really bad hunting, but it does do it. Mate said its might be because of the high lift cams bd14 and bd10. But it can't be that cos it idles constant when the idle control valve is disconnected.
cheeRS
Yes that's it - red D shape thing stuck to the side of the throttle body. TPSs don't get gunked up as they're sealed (unless it's been broken
) - what normally happens with them is the tracks inside wear out and you get a zero reading in some places, normally exhibited by a hesitation or lack of power at a particular throttle point, including 'none'. WIth the ignition on but engine off you should get a smooth change in reading from zero to full (as you press the throttle pedal) on your monitor - if it works when the engine's not running anyway.
Your ISCV could be clogged up with crap - do you have a spare to try it with? if not, whip it off and soak it in carb cleaner.
When you reconnect the ISCV while the engine's running, it will rev high, up to 2-2.5k then settle down, and try to control the idle depending on engine load, cold start (read from coolant temperature), etc.
If it only 'hunts' while it's connected it's probably the valve getting stuck, so the ECU tries to open it wider, until it opens, then it sees the idle too high when it pushes past the resistance, closes it right up, then does the same again, etc etc. Clean the valve out to at least rule it out.
