Quote:
Originally Posted by ischmitz
Avale,
I just went through the entire thread and I haven't found an answer to the first simple question: Does the ICV vibrate when the igniton is ON but the engine isn't running? If not you have a bad ECU or harness.
Next, you can you do a couple of simple tests: Take the ICV out so you can see the internal vane.
1. Disconnect the plug from the ICV and move the vane to fully open and then connect it while the ignition is in the ON position. It should move back to about mid-position, vibrate and jerk a little once every second when you hold it in your hand.
2. Same test as above but move the vane to fully closed.
In both cases the ICV needs to move to the exact same position. If the vane snaps to one end (fully open) and doesn't vibrate you have a bad ECU or harness.
Ingo
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OK, the ICV does vibrate and pulses every so often.
Test 1 above (starting from fully open position) - It moved very slightly towards the center (no where near the center though), vibrates and pulses (or jerks as you stated) once every second.
Test 2 above (starting from fully closed position) - It moved to the same position as Test 1 (a little bit closed from fully open, but no where near the center though), vibrates and pulses (or jerk as you stated) once every second
So I'm starting to question whether the ECM is bad. I recall reading somewhere that you can connect a couple of pins to remove the ECM to adjust the idle. I'm I remembering that correctly? Would that be a logical next step to see if the ICV centers itself or not? In my previous test where I was able to manually create a stable idle at 880 I set the ICV in the center of the motion. I measured across pins 33 and 34 in the ECM connector and got 41 Ohms so that is within spec and appears the harness is good there.