MartinC

Last night, my son's 91 V6 stalled on him, wouldn't start for a minute or two, and then started, but with a fast idle. (~2,000 RPM).

I drove it home and shortly after driving, it idled down and then seemed to run ok - idled normally after shutting off and restarting.

This morning, it's again idling fast...about 1650 today.

I checked the codes, and I'm getting:

14 - Coolant Sensor - low high temperature fault
35 - IAC Fault
53 - System over voltage

(if I'm reading these right).

I'm not sure what this is telling me...

Any advice on the cause of this??

(sorry if this is redundant, but with the search function down, I couldn't find similar problems in the forum..)

MartinC

Although it hasn't done the fast idle thing since I cleaned the throttle body and IAC valve, we're still getting an intermittent service engine soon light...it'll come on for a few minutes and then go out.

I checked the codes and I'm seeing:

23 - MAT temp too low?
53 - voltage too high?

What is this telling me??