Car runs on after turning ignition off but not every time please help

1996 Vauxhall Vectra 1.8 petrol manual

Car: Vauxhall Vectra
Year: 1996
Variant: 1.8 petrol manual

Categories: Running Rough, Starting & Power Loss

the car runs very well but on occasions will run on sometimes after a along trip sometimes after a short trip.

Problem added: Mar 26, 2010 (14 years ago)

Points: 2

Only times I've had that problem in workshop was caused by idle speed being far to fast .Other cause on some cars with high mileage was due to carbon build up on valves .

Answered Mar 27, 2010 (14 years ago)

whittingehame

Points: 37,684

hi.check the idle stepper motor it may have a carbon build up on the tapered seat allowing too much air to pass the valve seat,this was a common fault on this car. moley1956

Answered Mar 27, 2010 (14 years ago)

moley1956

Points: 107

suspect IAC valve or dirty throttle pot

Answered Mar 28, 2010 (14 years ago)

elannor67

Points: 395

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