1994 Ford Ranger with a V6.
At engine start it up it idles at 500 rpm or lower and kinda throbs, sometimes shutting off.
Action thus far…
I pulled the IAC and the part was very grungy so I replaced it thinking it was the culprit. Alas it was not the culprit. Although it SEEMS like engine does not die as readily. The problem persist.
I clean the throttle body and Mass air sensor, replacing the air filter.
Removing the wiring connection to the MAS and it idles just fine. Bad MAS?
Replaced MAS with new part. Drove it around a little. Still idles very low RPM on start-up
Idle in ‘P’ is better after driving the car long enough that it’s fully warm.
It doesn’t die when stopped or heated up in gear.
It throbs to the point of shutting off.
Maybe I need to just drive the car some more so the computer can “learn” the new sensor.
Next up is to break out the Vacuum gauge and test for a vacuum leak.
This car is not ODB II and there is no check engine light.
It’s really annoying to throw parts at a problem. Now I’m thinking the MAS may have been fine and I just threw $90 down the drain.