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Old 05-12-2011, 20:33   #1 (permalink)
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03 navigator shakes/vibrates when pressing gas at high speeds

I have a 03 navigator and when I drive on the freeway like 65 + mph, let go of the gas then press on the gas to speed up, the bottom of the car shakes/vibrates. This happens most of the time and it does not happen when I press on the gas really slow. What do you think is the problem?
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Old 05-12-2011, 21:15   #2 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

Take it to Autozone and they'll pull codes for free. See what comes up.
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Old 05-12-2011, 23:18   #3 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

The check engine light is not on though
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Old 05-13-2011, 09:24   #4 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

The light doesn't have to be on to have a code.
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Old 06-29-2011, 11:22   #5 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

There is no codes. I asked my teacher at school, told him if it could be a transmission problem, or maybe a spark plug problem, and he said it may be the torque converter or something like that. Do you think so too?
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Old 06-30-2011, 17:14   #6 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

It's possible for that or other things. Without being able to experience it, I couldn't say what it is. How many miles on the spark plugs? Does it feel like it's missing?
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Old 07-01-2011, 11:22   #7 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

Yea, it is the spark plugs. I drove home last night, and the car shook like crazy. I slowed down and the car was shaking and was about to shut off by itself. I could not get the car past 60 mph and it definitely sounded like it was misfiring.
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Old 03-14-2013, 20:10   #8 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

Update:

This problem has been solved. No mechanics and the first time i took it into the Ford dealer could not figure out the problem. Second time i took it to the Ford dealer, they finally figured out that the transmission was going out. They dropped the tranny opened it, and it was fried. Ended up replacing a new transmission and cost almost 4 grand! Now, car drives smooth and no more jerking when pressing the gas pedal.
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Old 03-15-2013, 09:02   #9 (permalink)
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Re: 03 navigator shakes/vibrates when pressing gas at high speeds

Sorry to hear the cost but glad to hear that it's fixed.
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