rough idle Volvo 945T

Discussion in 'Volvo 940' started by scidoc, Sep 22, 2003.

  1. scidoc

    scidoc Guest

    93 volvo turbo wagon idles roughly. Mechanic (volvos only, excellent
    reputation, says ignition is missing on scope, but said he could not
    figure out the problem. At high rpm problem is not noticeable.
    He states tried air mass meter;coil and coil wire has missing spark
    signal to power stage intermittent tried ign ecu and fuel ecu-still

    A few weeks prior to this problem I noticed that idle speed decreased
    and car stalled when battery cable resistance was high. Burned my hand
    on battery clamp. Brushed terminals and battery clamps and idle
    returned to normal.

    A few weeks later I donated my 84 Volvo and I replaced the battery of
    the 93 because my old Volvo battery was new. I have never observed
    changes in idle speed due to battery resistance being too high. I
    thought the car should run fine without the battery once it has
    started. I am an electrical engineer by training, but not an expert in
    auto ignitions.

    Can anyone provide any incite as to why the rough idle? Would
    appreciate any advice.

    Thanks in advance
    scidoc, Sep 22, 2003
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