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Posts posted by johnjohndoe

  1. 1999 Infiniti QX4 VG33


    I cleaned my throttle body because the baffle was sticking harder and harder over the last couple months. After cleaning off the 1/32” of gunk my idle went from 750-850RPM to 1200-1300RPM.


    With the idle high like is, when I put it in D the vehicle wants to move forward. I have to press the brakes harder to keep from moving forward. Then when slowing down from highway speeds the trans downshifts harder than normal around 45mph. I believe it’s actually the lockup clutch disengaging while still receiving torque from the engine.


    I can’t figure out how to adjust the IACV under the intake and so I decided to adjust the fast idle which worked well to bring the idle RPM back to the 750-850 range. I marked it so I know where to put it back at if need be.


    The problem is that when I started the engine earlier the O/D light began flashing for about 10-15 seconds. I am worried that I will somehow damage the trans and that I’ll have to put yet another one in...


    After adjusting the fast idle the rough downshift/lockup is gone completely, and is actually smoother than ever.


    Things I have considered:

    1. There is a significant vacuum leak that began when I cleaned the throttle body which is the root cause of the high idle.

    2. I didn’t allow enough time to let the ECU readjust for the newly cleaned throttle body.

    3. I removed enough metal during cleaning (maroon scotchbrite) that the baffle is permanently passing more air and the factory fast idle setting is no longer useful.


    I’m shooting in the dark with this and need someone to shine a light.

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