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Bucking/Jerking while driving 00" 4.6 F-150

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Old 04-02-2008, 09:39 AM
Schuby Schuby is offline
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Bucking/Jerking while driving 00" 4.6 F-150

Here we go. My truck has been bucking/jerking/sputtering/etc. while driving for about a month.
More noticeable on interstate in final gear. I have 2000 4.6 man. tranny.
I have a cold air intake. I just replaced MAF sensor( thought for sure that would fix it) but still does it but not as often. Seems to do it more often when under acceleration or load ( going up hills ). What would be next step to look at . Truck has 110,000
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Old 04-02-2008, 10:41 AM
dvndog dvndog is offline
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I Would Start Maybe With A Fuel Filter And Plugs, Hows The Idle?
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Old 04-02-2008, 10:43 AM
Schuby Schuby is offline
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it idles fine & starts fine
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Old 04-02-2008, 05:06 PM
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SICKANDTWYSTED SICKANDTWYSTED is offline
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does it happens at 40-60 mph after you let off the gas and ease back into it? could be the infamous "lean miss". i replaced my plugs and coils with Accells at 90k and it fixed my problem.
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Old 04-02-2008, 05:09 PM
Schuby Schuby is offline
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I can feel it at any speed. It does it more when the rpm's are low and you give it more gas like when in 5th gear trying to pass and does it worse when you floor it, but I can feel it in any gear.
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Old 04-02-2008, 07:47 PM
cstrout28 cstrout28 is offline
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it might be the coil packs i had to replace 5 in my 2000 4.6 do you notice it more when its wet outside?
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Old 04-03-2008, 07:34 AM
m350 m350 is offline
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My sons 01 F-150, 4.6, 5,speed,,had about 184 k on it, the thing bucked and coughed alot,,more when wet,,changed the plugs and coil packs,,put a dab of dielectric grease in each coilpack, before it was put in place,,,He took it for it's maiden voyage after the install,,came back with BIG smile,,what a difference he said,,pulled the big hill in OD,,no Bucking at all !

PS. Here's a Tip,,,,,to make the install a bit easier on the installer,,,,Instead of kneeling on the radiator support,,we had this wooden frame work about 4' high,,Put a pc of plywood from that,,, to the radiator support,,with a blanket to soften it,,a small step ladder to help up,,,he layed flat on the plywood,,,headfirst into the engine bay,,,no stress,,removed a couple things in the way,,I fed him tools, gapped plugs, coilpacs, etc, install went very well for him and me this way, and no hurting knees or back,,,I recomend it! They do make a creeper that will Hang over the engine bay also. Later,,,,Mark
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Old 04-03-2008, 08:14 AM
Schuby Schuby is offline
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I'll have to wait till it rains again to check. If it is worse when it rains, is that an indication for the COP's?
(PS. ever since I changed my MAF sensor it has been running stronger )
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Old 04-03-2008, 03:21 PM
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99% sure you have a bad coil.
The lean miss comes about during the time the EGR is open and the fuel is cut back (lean codition) in the 45 to 65 mph speed range. As you apply light throttle,the plugs require higher voltage to fire. If one coil has lower output you get a missfire stumble.
Old plugs can 'contribute' to this.
Have the coils stress tested to find the one or more at fault.
This kind of fault usually does not set a cylinder code.
None of this has any direct relationship to fuel filters. If it did, other parts of the operating rpm range and power would be also affected.
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Old 04-03-2008, 04:49 PM
Schuby Schuby is offline
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where is the best & cheapest place to buy them. Are they called coil packs or COPS ( coil on plug ) ?
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Old 04-03-2008, 07:49 PM
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The cheapest and best shouldnt belong in the same sentence. Some people have found 8 COPS for $100 bucks..but i would seriously doubt if they were quality made parts.
Now you can go to Summit Racing and get 8 Accel COPS for a good price, and if i ever need to replace my COPS i will go with the Accels.
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Old 04-03-2008, 09:35 PM
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When did you last do the plugs? Did you install Bosch? When I replaced my plugs with Bosch, I started having the same issue as you did. Swapped them for Autolites...problem solved. Never did throw a code...
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Old 04-04-2008, 09:09 AM
m350 m350 is offline
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When we got my sons F-150,,the guy we bought it from purchased 8 platinum Motorcraft plugs and 8, Motorcraft coil pacs,,and he said it was about $ 300 bucks for them as I recall,,,we paid him $100 bucks over the cost of the truck for them all.
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Old 04-04-2008, 09:19 AM
Schuby Schuby is offline
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I've never replaced plugs or coil packs in my truck...so I easilt know it needs to be done...but $300 for plugs & packs??
I looked somewhere & you could get 8 motorcraft plugs ( not platinum ) for around $40-60
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Old 04-04-2008, 09:26 AM
Schuby Schuby is offline
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Does everybody here recommend motorcraft or are there other good plugs out there?
Also...what is the best way to determine which coil pack has went bad?
I wont be able to replace all of them right now ( thank you Economy & Big Oil )
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