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        General >> Problems >> idle speed too high
        
(Message started by: boy_tom22 on Apr 11^th, 2006, 2:10am)

Title: idle speed too high
Post by boy_tom22 on Apr 11^th, 2006, 2:10am

after returning fron garage where new clutch was fitted the idle speed is too high at 1200rpm. Have checked usual air leak etc. What is realy funny is that if I am on a hill with engine turned on and I let car (out of gear) run down the hill the revs go up -- can go to 3000 if I get enough speed up. Why should engine speed up in this situation? I am really tearing my hair out.

Title: Re: idle speed too high
Post by Octavian_P on Apr 11^th, 2006, 7:30am

Hi

Maybe the VSS was disturbed in the cluth change operation

Cheers

Title: Re: idle speed too high
Post by Thunderchild on Apr 11^th, 2006, 10:04am

The most likely cause is an air leak. The mixture is weakened by the extra air and the ECU detects this via the lamda sensor and adds more fuel to the mixture and so the revs increase. Check all connections in the inlet route and listen for the hiss as the air is drawn in.

HTH

Thunderchild

Title: Re: idle speed too high
Post by trogg on Apr 11^th, 2006, 6:21pm

i had the same thing it turned out to be a loose clamp letting in air.

Title: Re: idle speed too high
Post by sector-9 on Apr 11^th, 2006, 7:07pm

Disconnect the speed sensor (on the gearbox - follow the wires) and see if the revs drop back to normal; it might have gotten damaged when the removed the 'box.

Darren