Symptoms
1. Turn key...ticking of stepper motor heard (all good)
2. Start engine~idle about 1100 rpm on cold start
3. Engine quickly settles to 800rpm (still cold, not yet warmed up))
4. Get down the road to first stop light..revs drop to 200~300rpm and stall
5. A few days later I do a ECU reset but removing battery positive terminal for 15 minutes.
6. No change to previous condition.
Next morning~determined to sort it out (impatient
)1. Early morning run~same symptoms
2. Get home and leave engine running (idling smoothly about 300~400 rpm)
3. Locate idle screw~ find to my amazement that it is totally screwed in
4. Now I think...idle has been set when cold to 800rpm...cold rpm should be around 2000rpm
5. Engine still running and warm 90 degrees approx
6. Set idle to 800rpm (using the screw on top of the throttle body)... Mine didn't have a cap over it.
7. Watch while radiator fan kicks in~ all good ~rpm adjusts about 800rpm
8. Turn on air conditioner on high ~ all good ~rpm adjusts about 800rpm
Conclusion~ trial again from cold later before jumping to a final conclusion
I guess the next few days will tell if the stepper motor is working properly or if there is more work to be done
The pictures of the throttle body (in another post) with arrows and letters marking the idle screw, stepper motor, TPS etc were most helpful ....thanks
