OK, a Th'giving mystery for you sharp vanagon =
sleuths to
discern, while I remind myself I really am thankful for my =
vanagon!
Here are the facts, as I know them:
- idles (about 800 rpm) and accelerates well when =
warm - plenty
of pep and smooth rpms
- when cold, takes 3 or 4 starts or lots =
of accelerator to
prevent stalling out - until warm enough) - will run after a start for =
about 5
sec., then plunge into stall
- just before cold weather got new plugs, wires, =
distributor, air filter, O2 sensor, coolant flush and fill (mechanic =
friend
did all)
- within specs tests / adjustment (per Bentley) on =
throttle
valve switch, idle speed control valve, air flow meter, temp 2 sensor =
(my
testing on all - TVS adjusted, ISCV hums, vibrates and has correct =
resistance,
AFM and temp 2 sensor all have correct resistance readings)
- throttle body and other main air passages and hoses =
clean and
snug
- vacuum system looks ok so far, though I've not yet =
found
every hose and component
I don't see any compelling reason to suspect the =
idle control
unit or ECU, especially since idle and normal run is good once =
warm. It is
only a cold start and cold run problem. What else could it
be? Could one or more of the components I've tested still be =
bad in
spite of passing the tests? e.g., temp 2 sensor would seem a =
likely
culprit (as some of you have suggested), but could it be bad if it gives =
good
resistance readings at various coolant (engine) temperatures? I =
would
think not. Hope it's not something more exotic. I have NOT =
done any
CO tests (not having the equipment) or output voltage =
readings.
Any suggestions would be greatly appreciated (and =
make my
Thanksgiving more thankful!).
Jim Creech
87 Westy GL 2.1
79k miles, 2nd owner