Question about 1994 Ford Thunderbird

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INTERMITTEN RUFF IDLE ., COULD THIS BE THE FUEL OR FILTER? OR FAULTY ALT , VOLT REGULATOR OR SOME OTHER PROBLEM.

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Get car scanned at a parts place for free to spot any bad codes-if ok then chec dist and plug wires ; any vacuum leaks; or fuel delivery issues

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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The regulator is on top of the engine along the gas line. It has a vacuum line on top. Start the truck and pull the vacuum line off the regulator. If fuel comes out of the regulator, it has failed. You can run pretty rich with a busted regulator-especially at idle.

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mcdevito75 here, Sounds like a faulty voltage regulator, it"s 1 unit with the alternator, change the alternator, also the alt. supplies juice to the ignition switch, distributor abd plugs, thus a rough idle due to bad alternator.

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Ruff idle was wondring if problem could be/ o2 sensor/trottle control / I disconnected the MAF sensor and noticed that it is a little better but still ruff idle . From time to time . Example when i come...


The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum.
Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit with everything off. If it drops like a rock, you have a fuel pressure leak. Check the vac line on fuel pressure regulator, where applicable, if it has gas in it, the regulator is faulty.
Smell of your crankcase oil dipstick, does it smell like gas? If so, either you don't change oil and filter very often or there is a fuel leak getting into your oil.
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