I have a high rpm @ idle (1500 rpm) when the car is getting warm.
When i start it cold the rpm's seem about right (1100 rpm) but when the warm up cycle is over and the rpm's are supposed to drop, they climb instead.
I have to say it never really idled well, always a little higher than it should (around 980 rpm on a great day) Did the idle reset procedure many times before to try and correct this problem (unhook battery for 1/2 an hour plug the battery back and leave ignition on for about 3 minutes, it works for a while but now it started to idle high again last night leaving work.
did so far.
Checked the ECT:
-From a cold start, temperature climbs steadily up to 90 celcius when monitoring it
with the VAG-COM scan tool. (Tried 3 different ECT's i had lying around and
tested the resistance value) all of them where ok (Blue one with 2 pins).
Checked for vaccum leaks:
- Replaced the lines from intake manifold to FPR and Check valve to secondary air
No leaks anywhere coming from the intake boot.
I don't believe it's a leak at all because the engine would either die (major leak)
Idle erratically or throw you a lean condition code (Idle is really steady but high
on mine). Unless i missed something.
- Opened it up and cleaned the circuit board (even though the rheostat was
immaculate on TPS) Butterfly and interior is all washed super clean and opens
and closes freely.
- It was bad at one point (pickup screen split in half) ran super rich with no
codes (no brainer) and replaced it, works good.
Code active right now.
- P0501 (speed sensor) but has nothing to do with idle
I've done alot of digging on these forums and some troubleshoots came really close but in the end the recommended fixes where already checked and confirmed not to be the issue.
I'd really appreciate some brain storms here (minus the ones i've listed above) and any data you can throw at me to verify, i'm sorry if this post has been redundant for some people, but none of the fixes i could find corrected the issue i am having. Ask me any questions you want, i'll be more than happy to answer and if this post can help somebody else with this problem.that would be awesome.
Thanks in advance.