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Please excuse my mechanical ignorance!

 

My TR6 (PI) normally idles perfectly at about 5/600 rpm. Out of the blue however the idling speed has shot up to something between 1500/2000 rpm (very embarrassing whilst waiting at traffic lights!) but otherwise continues to run fine.

 

Have checked the throttle linkage and all seems OK. Also the choke cables are securely fixed and haven't slipped. If I use a finger tip to push the excess fuel lever on the metering unit back the engine will revert to a normal idling speed but is this just because doing so makes the mixture richer? When I do push the lever back however the engine doesn't react as though the mixture is over-rich i.e. it runs as smoothly as ever.

 

Any ideas as to what to check first would be much appreciated.

 

Chris Porter

 

 

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Sounds like an air leak to me, letting extra air in.

 

Check all the rubber hoses as one may have split?

 

Hth

 

Steve

Edited by SDerbyshire
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