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Thread: idle surge

  1. #21
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    Member No: 6159 romario has a spectacular aura about romario has a spectacular aura about romario has a spectacular aura about romario's Avatar
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    Yes | No

    Could it also be just a loose spark plug?



  2. #22
    DanlP
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    Yes | No

    Re: idle surge

    Interesting followup

    Since this idle surge problem seemed tightly tied to specific warm up temps, I thought I'd disconnect the temp sensors. Started with all 3, but as you might expect the critical one is the DME coolant temp sensor.

    With it disconnected the idle is smooth with zero surges. Other than at first (morning) startup, engine runs very well.

    Have ordered a new sensor - hope this will end the mystery.

    These damn cars are very idiotic at times ..............

  3. #23
    DanlP
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    Yes | No

    INTERESTING UPDATE - CAUSES NOT EXPECTED

    Final word still out, but at the moment this set of symptoms seems to have been the result of 2 unrelated problems:

    1. Wiring to ICV: seems one of the 3 wires (inside the sheath) was cracked and causing an intermittent open. That cause the ICV to surge at times as the wire sometimes passed current and at other times did not.

    2. Bad Coolant Temp. Sensor: seems to have been shorting to ground, but only at certain temps (only at specific points in the warm-up cycle). As the engine warmed the sensor would fail - causing, I think, a DME problem - but then be OK as the temp. continued to rise.

    Who wouldda thunk!

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