97 Taurus Continues to Run after Shut-Off

Its interesting how a port injected engine could continue to run after its turned off and the injectors are electric. Unless there leaking?

The roughness could be a coil pack failing under heat load

Bob

I agree that the injectors, if properly sealing, should stop any run-on. May be time to clean the injectors again. This is the first time I've had a port injected engine display run-on. And no codes were shown. But it's strange that the rough running was transient - it lasted for about 4 minutes. Much like the behaviour of the truck.

I've been buying gas at the local supermarket stations, and Sam's Club station. It may also be time to pay a little more and switch back to Shell.

Thanks for the input about the coil pack. Probably a good idea to replace it, keeping the old one as an emergency spare.

GT

ALL Taurus engine only require 87 octane fuel, as do most Fords, even high performance models like the Mustang GT. The owners manual states using a higher octane fuel 'may cause derivability problems.' Perhaps that is your problem. Why not take your vehicle to a competent technician and have him perform a diagnostic test to be sure you don't have a more serious problem that may cost you a lot more money if not corrected?

mike hunt

GT wrote:

At lower elevations, most all regular fuel is 87 octane.

In Denver, however, all regular fuel is 85 octane, mid-grade is 87, premium is 91. They get away with the lower octane rating because of the elevation. This car has had problems with 85 octane fuel. It runs much better, gets better mileage, no vapor locks, etc. with 87 octane. The manual says to use

I put in a container of Chevron fuel injector cleaner today, and the problems seem to have disappeared. But today wasn't quite as hot as yesterday either. I think the injectors probably need to be cleaned as a result of garbage in the fuel. Fuel filter was replaced 4000 miles ago.

GT