Question about 1988 Ford Bronco II

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My 1988 Ford Bronco 2 loses horsepower.

My 1988 Ford Bronco 2 loses power and then it will regain it after a cycle or 2 of the cylinders. It only happens when I press the gas down a bit over a 1/3 of the way and only if I've been driving it for 10-15 minutes. It'll keep doing this loss and gain of power until you let off the gas. It has gotten to where the engine just stalls out. It also is running fairly rich even after it's been to the repair shop. I've had the O2 sensor and the oil level switch (or something to that tune to make the oil light turn on when it shouldn't be) replaced and it is timed. This is a replacement engine that was put in 10 years ago and it has been sitting for the last six until mid June. I pumped the gas and the fuel injectors were been cleaned at the shop. I'm thinking it might be a failing alternator or a bad ignition module or something else to do with the distributor.

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I would suspect a bad fuel pump and plugged fuel filter for something sitting that long without use, but that doesn't explain the high fuel use. Check the fuel pressure at the test port in the fuel rail above the injectors, it should be about 40 to 50 PSI. If it is much higher, suspect the pressure regulator. Is the check engine light on? If so, rent a scanner, read the code(s), and follow the clues to repairs. If the alternator were going bad, you'd be losing battery charge. If something is bad with the ignition, the code reader should pick it up.

Posted on Sep 07, 2009


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