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Thread: Z20LET 140kw NON-STABLE motor rpm

  
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    Vesly's Avatar
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    Z20LET 140kw NON-STABLE motor rpm

    Hello, I bought Astra Coupe 2001 140kw Z20LET, black colour.
    I put it into authorized servise OPEL to do brakes, oil, filter, .... so everything I know is quite NEW.

    Problem is with motor rpm when I stay. Every 5-10 seconds motor tugs for a moment (cca 50ms) from 900 rpm to cca 850 and back on 900, then are stable for another 5-10 seconds.
    This TUGing is permament every 5-10s, but only when I stay. When I drive the car, motor rpm are clean without fail. Then I stop a and tug again.
    BUT - in the morning, when the rpm are about 1200 for about 1 minute, motor goes well and no tug.
    I have cleaned up throttle valve and no success, I have checked all hosepipes and they are OK... Everything is on my car in good condition except this..

    Could anyone help me..? Thnx a lot..

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    Andy_888's Avatar
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    I have had similar since I changed my crank speed sensor (but then just before I replaced it the car would cut out rather than idle )

    Be interesting to see what the cause / solution is
    888 Coupe - The original and best!
    For sale - 1x Kidney, Slightly abused by alcohol
    £45,000 or Part Ex for VXR8 Bathurst-S

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    re

    OK, I will try to control crank speed sensor. Could You advise me where to find it.?

    I forgot to write, when I turn key od possition n.1 I can heard some strange electrical noise from idle motor, after 10s the noise is away.

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