Engine miss - Engine Troubleshooting


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Engine miss

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

bernsax
User

Oct 25, 2009, 7:26 AM

Post #1 of 4 (3182 views)

Engine miss	Sign In

This problem concerns a 1999 Ford Taurus 24 valve engine. It has 112,000 miles on the odometer.

After the car has warmed up, the engine begins to miss when idling. I don't notice it when traveling down the hi way.

I took it to a mechanic the other day but it was only a 2 mile drive to his garage and it didn't do it then.

However, after traveling several miles yesterday, the engine missed each time I came to a stop.

I changed the fuel filter last week. It had new plugs and plug wires 14,000 miles ago. I add injector cleaner at each oil change (at 3,000 miles).

The check engine light does not come on.

If it was a problem with the injectors, wouldn't it miss 100% of the time? It is puzzling that it only does it after being sufficiently warmed up.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Oct 25, 2009, 11:15 AM

Post #2 of 4 (3177 views)

Re: Engine miss	Sign In

bernsax; The '99 has misfire detection and should be setting a DTC, if so. Scanning the PCM should tell you. With that said; If it runs okay when cold, but starts running rough when warm, you may have a vacuum leak. When the engine is cold, it runs rich which in turn can 'mask' a vacuum leak. As the engine warms, the fuel delivery leans. But, if it is a vacuum leak, I'd think that the O2 sensors would be picking up on this. Same with a faulty pressure regulator or an injector problem. When you turn the ignition on, the check engine (or service engine soon) lamp should be on, then go off after a few seconds when the engine starts. I'd recommend having the PCM scanned (with live data).
Loren
SW Washington

bernsax
User

Nov 17, 2009, 4:39 PM

Post #3 of 4 (3143 views)

Re: Engine miss	Sign In

Turned out that it had one band spark plug wire. I'm surprised because the set was new not that long ago.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Nov 17, 2009, 6:26 PM

Post #4 of 4 (3137 views)

Re: Engine miss	Sign In

Thanks for taking the time for the update. Glad to hear everything is 'Good in the world'. Have a great week.
Loren
SW Washington

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