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post #1 of 4 (permalink) Old 09-10-08, 07:03 AM Thread Starter
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2001 Expedition 4.6 hesitation

The hesitation only occurs at 55-60 mph at 1500- 1700 rpm, I changed the fuel filter but haven't done a fuel pressure test yet. Ran sea foam through the intake and gas tank. Fuel pump??? Any ideas- thanks

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post #2 of 4 (permalink) Old 10-06-08, 04:31 PM
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Re: 2001 Expedition 4.6 hesitation

If there is no hesitation at higher rpm then you can rule out the fuel pump as a culprit. It sounds to me like you're experiencing engine 'lug', which happens at lower rpms. To test this out a bit better, drive at the same 55-60mph and keep the vehicle in third gear (not 4th or Over Drive) which should bring rpms around the 2600rpm mark. If the hesitation is still there then it rules out engine lug.

When was the last tune up performed, with new plugs? When you manage to do a fuel pressure test, get a compression test done as well. This will ensure that the engine isn't purposefully straining itself at 1500rpm. It takes a lot of torque to move around 3 tons of mass don't forget.

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post #3 of 4 (permalink) Old 10-30-08, 03:31 PM Thread Starter
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Re: 2001 Expedition 4.6 hesitation

The problem was 3 bad coils. Had to have them stress tested to find the culprits. Changed them and the plugs problem solved.
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post #4 of 4 (permalink) Old 03-09-09, 11:19 PM
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Re: 2001 Expedition 4.6 hesitation

How did you streess or load test the coils? Did you have Dealer do it? Or?
thanks in advance!
Scott in Vegas with same problem.
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