I have been having this idle problem for a while now. The car drives
fine, but the following symptoms occur while sitting at a light, stop
The engine idles between 1500 and 1750 RPMs for 10 seconds, drops down
to about 900-1100, wobbles a bit, and settles in that range somewhere
when the check engine light comes on.
If I goose the throttle, the check engine light turns off and the
symptoms described above re-occur in the same order. I have installed
a new TPS, idle air control valve and O2 sensor over the past year.
Like I said, it is not preventing me from driving the car, but is darn
annoying when stopped.
I have a new tempature switch I was going to install when I got around
to changing the oil next, seems like the best way to get at the heater
tube situated underneath the lower intake manifold.
Last year I climbed Mt. Washington with the car and it has not been
the same since. It overheated at 5000 ft because the fan would not
turn on, a paper-clip fixed that temporarily. Wondering if the
temperature spike might have damaged the temperature switch used by
the computer. It definately fried the voltage regulator, but that is
Can anyone offer any suggestions? I have pulled the codes but mostly
they point out an open fuel loop condition, with rich limit reached.
I am pretty sure I have pulled these codes in the past before this
started happening. I know there is might too much air getting in, but
so far cannot find any vacuum leaks. Manifold pressure is about 17-18
psi at 1000 RPMs. The fuel pressure seems OK, around 36 psi.
Obviously it is getting on in years and I should just give up the
ghost, but I am not against spending a few bucks on parts here and
there to keep it running while it lasts.