On older carb engines, if there were hot spots due to carbon, these with the compression would ignite the fuel, and if the car had a mechanical fuel pump, the engine would carry on running because fuel is being supplied and there is no longer a need for a spark.Nev said:Isn't run-on due to fuel still entering a hot engine?
Doesn't that have something to do with carbon
deposit build-up? Or throttle stuck slightly open
when switching off.
Should be less likely with a modern injected engine.
Could be anything in a modern car.
I think it's more common with diesels .
I had an old corrolla that would carry on running. I would just put it in gear and let go of the clutch while holding down hard on the brake.glenda said:This happened me years ago when I was driving my Dads Vauxhall Cavalier. The water pump was knackered and the engine was so hot that the only way to get it to stop was to take the leads off the spark plugs
yep thats what I`ve been doing, except the cooling fans keep running so have to disconnect the battery to stop them.Rob 156 said:I had an old corrolla that would carry on running. I would just put it in gear and let go of the clutch while holding down hard on the brake.
Left it running only for about 5 mins, seemed like it would have gone on to drain the tank,yep you`re right too, it could be a whole heap of thingsgavin dack said:Another thing. Will it the engine run for hours after you take the key out. Or a few mins. it could be a electrical fault stoping the CDI from turning off.
Not sure realy its one of them jobs that could be loads of things wrong.