I've energized the IACV and it appears to be moving up and down. The AAC has been completely cleaned out with isopropyl(rubbing alcohol). With the 2 parts connected, I've energized the IACV and can see the plunger of the AAC unit freely moving. No sticking of the plunger and no broken parts inside. The spring attached to the plunger seems alittle soft on tension but works. The IACV works outside of the truck but don't know if it is actually working when installed. I've ran continuity checks from the ECM to the IACV harness and all seems fine. I've also ran a voltage check from the ECM to the harness with engine off and key on and battery voltage is present. I put the IACV on the test bench and connected it to a variable power supply with 12 volts. It was drawing 1.2 amps of current when I pushed down on the plunger inside the 'sleeve' of the IACV to close the circuit. It 'jumped' when the circuit was closed. In effect, moving the plunger in and out. I've also completely cleaned out the air passages of the throttle body and AAC passages. Looked like molasses in there! Still the problem persists. On the fuel side. I have fuel in the tank, fuel pump works, fuel pressure test checks out, fuel filter not clogged or blocked, all injectors are making a clicking sound when listened to with a stethoscope(mechanic's one), no fuel present when the vacuum line is pulled from the fuel pressure regulator. I ran an inline spark plug tester just to see what the plugs were doing and all checks out there. Cap & rotor seem fine as well. No visible cracks, water or carbon/dirt build up. Now I don't know if the sparks are weak or not but they seem fine. Just so you know, I have a strong background in electronics so I can test the heck out any electrical part. I work in electro-mechanical but more on the electronic side. But I can do medium duty mechanical work as well. So, any advice you give I will follow it exactly. Sorry for the 'book' I just wrote to you but feel you need as much info. As possible as I am detail oriented. Thank You for your time.
Monday, February 16th, 2009 AT 9:32 AM