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post #1 of 2 (permalink) Old 07-29-07, 03:36 PM Thread Starter
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Fuel Pump? Losing acceleration

Hi, I have a 1995 Grand Marquis 4.6 liter. I just changed the fuel filter. didn't help. My problem. While driving, the car seems to almost quit accelerating or holding speed for a slight second then kick back in. Only happens once in a while. But when it gets bad it happens every 3-4 minutes or so. Then it might not happen again for a day or 2. I tried downshifting when this happens to see if it was the tranny. Transmission seems fine. My next step is a fuel pump. Any ideas? suggestions? could a fuel pump stop working intermitently?

Thanks in advance for your help,
Scott
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post #2 of 2 (permalink) Old 07-30-07, 08:46 PM
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Re: Fuel Pump? Losing acceleration

I would take a look at exhaust system backpressure before I'd suspect the fuel pump. This is the classic symptom for a plugged cat converter or muffler. If the engine can't breathe, it loses power until the exhaust backpressure becomes greater than the blockage. Then the pressure releases and the cycle starts all over again.

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