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Thread: Need Help on Idle Hunting Issue

  1. #1

    Need Help on Idle Hunting Issue

    Short story - I have new injectors, new spark plugs and a new O2 sensor. I've done a vacuum test using a smoke machine and spraying starter flui around and in both cases have not found a vacuum leak. My car hunts at idle when starting cold until it warms up. I try putting a dwell meter on it (after warmed up and after fans and come on and off) and all I get is a reading between 10.5 to 11 when set to 4 cylinder (Half that when set to 8 cylinder). It idles well when warm and I took a short drive and it seems to drive well. Two questions:

    1. What can I check to get rid of the hunting?
    2. Why isn't the dwell meter reading around 40? Perhaps the signal from the O2 sensor not getting trough?

    Shannon

  2. #2
    Banned From "Tight Ship"
    Join Date
    Sep 2013
    VIN
    1669
    Posts
    951
    Cold (<59F) or press WOT switch = 50-60 dwell
    Disconnect O2 sensor => 40-50 dwell
    Disconnect O2 sensor & ground harness lead => 87 or more dwell.
    Disconnected O2 sensor & apply 1.5 V to O2 harness lead => 20 or less dwell
    All readings above should be steady.

    All connected, air cleaner installed, ALL other settings correct and warm engine => 35-45 pulsating dwell
    1669 Sold. Looking for 5 spd...working on "other" DeLorean.

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