Originally Posted by
MrChocky
Reopening old threads seems to be current de jure, so here we go. Michael's descriptions and at least the diagnostic steps here lead me to choose this particular thread.
What I'm actually chasing is high idle (about 975) but the car based upon different attempts to measure it, is not going into closed loop (or at least, very rarely).
Last year, I replaced all the vacuum lines, O2 sensor, and have also put additional clamps on suspect vacuum leak spots, as well as replacing injector
seals, etc. This spring, I pulled my manifold for painting and expressly to check the vacuum routing in the valley - all fine.
I can't hear it, but I'm assured my FV is working. I've checked physical and electrical operation of idle and WOT switches, and recently also checked
the butterfly valves are closing fully. I do have DM's idle ECU (set to 775) which has the LED read out for closed loop mode which is obviously not coming on, and
for completeness, I've hooked up the "A/C bump" (as an aside, this has largely eliminated my stalls when coming to a stop), but obviously for testing no A/C is running.
The car has no cold start, hot start or other issues, and general seems to run exceptionally well given everything. What I will do shortly is pull the vacuum canister;
I know its hoses aren't always in good shape, and easy to check.
In any case, suggestions on things to things to measure, check (or hell, triple check). Nothing immediately jumps out at me from the thread, apart from perhaps
measuring the O2 sensor reading.
Thanks!