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Cavalier again

On advice of the group, I recently fitted a new idle speed control valve to the Cav 2.0 16v, 1995 vintage. Whilst doing it I decided to remove and clean the throttle body thoroughly. I removed the throttle potentiometer to avoid contaminating it with carb cleaner, but when refitting I found that the screw holes are much larger than the screws, hence allowing a significant amount of anglular variation when fitting.

I fitted it with the screws centrally in the holes, but the engine still doesn't idle properly and also now runs slightly lumpily when the revs are raised above idle with no load. The tailpipe has become more sooty than it used to be, but fuel consumption is still reasonable at about 37mpg average and there are no abnormalities during driving, except for the idle speed remaining too high.

Once again there are no fault codes present. Any more ideas before this ends up becoming like Peter's pinking thread!? Could it be the air-mass meter again? It was replaced about 2 years ago though. All breather pipes are clear too.

cheers James of Sunderland

Reply to
James
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They need to be adjusted for where the throttle stop position is, should just click off on throttle.

Reply to
Chris

In article , James writes

Suggests it's running rich. Air filter, oxygen sensor? Checked the ECU for stored faults? Given it an Italian tune-up with some Optimax or BP Ultimate in the tank?

Reply to
Mike Tomlinson

significant

That's what I was told by the vauxhall garage, but this one does not seem to click at either end of it's travel. I will try testing it with a multimeter later.

cheers James of Sunderland

Reply to
James

Classic case of if its not broken, don't fix it!

But anyway, as its done now, here is how to reset it. You will need a digital volt meter.

Pull back the rubber boot on the connector. There will be three wires coming out of the throttle position sensor. Brown/Black is earth, brown/blue is

+5V supply from ECU and brown/green is signal to ECU. You need to measure the voltage between earth and signal to ECU. Put the sensor back onto the throttle body, tighten the screws to hold the sensor in place but so it can just be moved by hand. With the ignition on but engine not running, adjust the position of the sensor until the voltmeter reads 0.57V. Tighten the screws carefully so as not to disturb the position, and the job is done.

All of the symptoms you describe would point to a badly adjusted TPS.

HTH

Anthony Remove eight from email to reply.

Reply to
Anthony Britt

Thanks very much for that Anthony. I will try to do this tomorrow and let you know the result.

cheers

James of Sunderland

Reply to
James

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