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post #1 of 7 (permalink) Old 10-19-13, 11:49 AM Thread Starter
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99 E-350 superduty bucks and skips

Hello,

I have a 99 E-350 superduty with a 5.4l. It skips and bucks when I am going up big hills and/or pulling onto the highway. Pretty much everytime I have to get on the gas hard. I have taken it to 2 mechanics one of which was a dealer and no one can find anything wrong with it even though there is. Any suggestions appreciated. Thanks in advance!!!
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post #2 of 7 (permalink) Old 10-19-13, 11:54 AM
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Re: 99 E-350 superduty bucks and skips

Have they ran a diagnostic ? no codes shown ?
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post #3 of 7 (permalink) Old 10-19-13, 09:09 PM
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Re: 99 E-350 superduty bucks and skips

If no code, check fuel pressure and vacuum. Could also be the initial stages of plugging cats.

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post #4 of 7 (permalink) Old 10-20-13, 06:04 PM Thread Starter
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Re: 99 E-350 superduty bucks and skips

there are no codes. At the dealership they ran all sorts of test and reprogrammed the computer and it is still bucking and skipping when you have to get on the gas to get up big hills or pulling onto the highway.
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post #5 of 7 (permalink) Old 10-20-13, 06:45 PM
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Re: 99 E-350 superduty bucks and skips

Does it feel like a misfire?


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post #6 of 7 (permalink) Old 10-21-13, 06:29 PM Thread Starter
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Re: 99 E-350 superduty bucks and skips

Yes, but its not misfiring according to the mechanic.
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post #7 of 7 (permalink) Old 10-22-13, 05:33 AM
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Re: 99 E-350 superduty bucks and skips

Maybe a second opinion. If you are able to duplicate for them I don't see why a good tech can't find any issues. Very difficult to tell without seeing some of the PCM data or driving.


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