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2000 mustang running rich,has fouled three sets of plugs in about 3 miles

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You can try resetting the computer and the long term fuel trim. This procedure is in the owner's manual if you have it... otherwise-
Do this correctly by:
1. disconnect the negative battery cable
2. turn on all the electrical accessories for 20+ minutes (there is a small amount of power that is stored even w/ the battery disconnected that saves the computer's memory, this needs to be drained completely for the computer to be reset).
3. re-connect the battery (and turn off all accessories)
4. start the car
5. let the car idle until it reaches normal operating temperature
6. allow to idle for one additional minute with all accessories off
7. still idling - turn on air-conditioning, for at least one minute, then turn air-conditioning off
8. drive around at least 10 miles to complete the re-learning process.

It will still take time/driving for the ECU to completely re-learn and set the appropriate long-term fuel trim, but if you are currently running rich... and this DOES work, you should be able to notice the change pretty quick. If this does not work, then you have only wasted an hour of your time and spent $0.

Posted on Jan 24, 2014

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