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..