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As the heading suggest I havea VK Calais 202 efi that is having a variation in RPM's while it sits at idle. Idles fine then raises a few revs then drops back to idling fine and after a few seconds will do it again. Engine has been rebuilt, fuel is a bit low but I dont think its enough to worry about, still 3 red marks on the guage. Any suggestions?
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Could be heaps of things electircally; TPS - idle contact, AFM (wiring or vacuum), control unit, Air temp sensor (in AFM), coolant temp sensor, Aux air valve circuit, ign coil - control relay circuit, inj circuit. Faulty EGR, vac advance setup wrong. Edited by user Wednesday, 28 November 2007 12:32:19 AM(UTC)
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ok will double check vacume hoses, may have missed one or have a split. The change in RPM is not consistant just seems to happen then a minute or so later happens again.
Intrested in the vacume advance as I broke the regulator ontop the thermostat hou |
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mine used to do somthing similar but mine did it at take off ,, all i did was chuck about 1/2 a can of thrttle body cleaner into the throttle body and that seemed to fix it after a few drives
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I gave the throttle body a clead out with a bit of WD40 as thats all I had at that stage, living in the country means nothing is open on the weekend, so will try that as it was a bit dirty and had been sitting for a while. Thanks.
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air intake bolts have been overtightened causing a crack in the air intake -vacuum leak.
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