Reply to "Idle Vaccuum"

larrywMember

If this problem is recent, maybe you've gotten a tank of fuel not quite up to your usual preferred octane rating? I ran very low once and had to put in five gallons of 87 regular. Had to put into gear, let out the clutch and stall it to stop the dieseling. I dumped in five gallons of race gas and problem stopped. Never used regular again.
The other common problem, which you are addressing by reducing the idle speed, is excess throttle plate opening. Many carburated cars will diesel if you shut off a hot engine with your foot on the gas.
Smells really nasty too.

11/29/153:10 PM

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