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  1. #1
    Elite Member hazmat's Avatar
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    Default Help with F150 rough idle/hesitation/vibration

    2001 F150 sometimes has rough idle & hesitates under light acceleration, but if you mash the pedal it runs fine. The hesitation is accompianed by a vibration.


    Of course the problem is intermittant. Dealer replaced Idle air control valve to the tune of $200. But it didn't solve the problem.

    Please help.

    I'm going to start another thread on computer code scanners.

  2. #2
    Epic Contributor Bird's Avatar
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    Default Re: Help with F150 rough idle/hesitation/vibration

    </font><font color="blue" class="small">( I'm going to start another thread on computer code scanners )</font>

    A couple of weeks ago, the "check engine" light came on on my 2001 Windstar. It was running just fine, but I took it to the dealer, they said they got a code indicating it had run a little rich at some time, but not now, so they supposedly checked the fuel pressure, etc., and found nothing wrong at all, so it only cost me $92.77 for them to check it out and find nothing wrong. [img]/forums/images/graemlins/frown.gif[/img] But since it took them over 3 hours to do it, they did give me the oil and filter change free. [img]/forums/images/graemlins/wink.gif[/img] [img]/forums/images/graemlins/laugh.gif[/img]

  3. #3
    Elite Member
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    IH 2444

    Default Re: Help with F150 rough idle/hesitation/vibration

    You can buy an engine code reader for about the same or less than having the dealer dump the codes one time. My vote is on plug wires or a coil pack. EGR...maybe...

  4. #4
    Platinum Member
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    Default Re: Help with F150 rough idle/hesitation/vibration

    I had a similar problem with my 2000 F150 (5.4L V-8). It was an injector that went bad. Not sure if this applies to you, since my truck went downhill real fast (as in over 2 days) before it would hardly even run. Good luck!

  5. #5
    Veteran Member Mark_in_NH's Avatar
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    New Holland TC35D w/ 16LA FEL

    Default Re: Help with F150 rough idle/hesitation/vibration

    I had a Very similar problem (no vibration) about 1.5 / 2 months ago with my 2000 F-150 4.6 V8 89,000 miles. The dealer replaced the plugs, which it was due for, and wound up replacing a coil pack to correct the problem.
    Long gone are the days of just one coil. My truck has 8 cylinders, 8 plugs and 8 coil packs. [img]/forums/images/graemlins/tongue.gif[/img]

  6. #6
    Gold Member
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    Still looking since thats half the fun!

    Default Re: Help with F150 rough idle/hesitation/vibration

    Easiest cheapest solution plug wires you can test those with a voltmeter.
    Also "Check engine lights" can be read at autozones for free.

  7. #7

    Join Date
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    L3010HST

    Default Re: Help with F150 rough idle/hesitation/vibration

    I would tend to lean towards a coil pack myself. These can be ohm tested as well. There should be a test for both the primary and secondary side of the coil. I'm not that familiar with the set up so I don't know which wires you need to hook the ohm meter too. Don't just go with an OE spec, but also check all of them to see if you have one that is weaker then the others.

  8. #8
    Veteran Member Rowski's Avatar
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    2004 New Holland TN70DA with 32LC loader, 2000 New Holland 2120 with Curtis cab, 7309 loader

    Default Re: Help with F150 rough idle/hesitation/vibration

    How many miles on the truck?

  9. #9
    Veteran Member
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    7275 Cub Cadet

    Default Re: Help with F150 rough idle/hesitation/vibration

    Check the vacuum hoses also. A leaky hose would cause that same problem. A vacuum gauge will tell you if there is a problem related to air leaks or a bad intake valve. Depending on your mileage, I would then look at the spark plugs, wires and coils.

  10. #10
    Elite Member hazmat's Avatar
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    Default Re: Help with F150 rough idle/hesitation/vibration

    Thanks for the tips guys.

    57,000 miles on the truck. I assume it is still on it's first set of plugs (I bought it at 19,000 miles).

    Per advice of another buddy, I cleaned the throttle body today - it was pretty sooted up. Is that normal??

    I also bought a new fuel filter - but didn't know I needed a gizmo to get the fuel line un-hooked. [img]/forums/images/graemlins/mad.gif[/img] I'll pick that up this week.

    Regarding the coils &amp; wires - I don't yet have a service manual. Anybody got the specs for testing those?

    Thanks again.

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