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engine stutters while in overdrive under strain

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Old Oct 3, 2003 | 10:29 PM
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engine stutters while in overdrive under strain

my 97 f-150 w/5.4 triton. when in overdrive, the engine acts as if it is stuttering when i go up hill. nothing drastic, but extremely noticable. when i turn the overdrive off, it runs just fine. what gives here ? is this the engine ? the transmission ? some weird sensor ?
 
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Old Oct 4, 2003 | 07:58 AM
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I experienced a similar action and thought first of the transmission. It turned out to be a COP (coil on plug) on #5 cylinder.
 
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Old Oct 4, 2003 | 08:57 PM
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thanks...... i am glad it was the coil, but am i going to regret that statement...is the coil replacement expensive >? can i do it myself ?
 
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Old Oct 5, 2003 | 07:49 AM
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frozen guy, I had mine replaced under an extended warranty which paid for the diagnostics, parts and repair minus my deductable. The total was about $225. So, after paying the $100 deductable plus sales tax on the taxable items, I paid $104 total. Could I have done the job myself? Yes, I probably could have replaced the part and no, I could not have diagnosed the problem outside of attempting a trial and error method of moving as many of the coils around as would have been necessary to find the bad one or to determine if one was bad in the first place.

Your vehicle may not have individual coils on each plug as mine has, so your situation may be different from mine. At any rate, I recommend having someone with the proper equipment/expertise determine exactly what is causing the shudder before tearing blind into high dollar electrical components

Whatever it turns out to be, good luck in finding and correcting the problem.
 
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Old Oct 5, 2003 | 11:59 AM
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frozen guy how many miles on your spark plugs?
One thing to look for too is for a leaking heater hose above #4 COP. The clamp is sometimes loose and coolant drips onto the coil which kills it.
 
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Old Oct 5, 2003 | 05:06 PM
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i had it scoped a week ago, and it coded out as a misfire on #4. we replaced the plugs, but this didn't fix the problem. i am hoping that it might be the coil ( it has individual coils) on #4. Now it is doing the 'missing out' thing when i accelerate from a stop light and at about 40-45 mph till i hit 50 or so. Does this still sound like the coil, and do i need to replace 1 ? or all 8 ?
 
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Old Oct 5, 2003 | 10:13 PM
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Is the check engine light on now?
If it is you should get it scanned for codes.
If not I'd be inclined to replace #4 COP and see what happens.
 
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Old Oct 5, 2003 | 11:39 PM
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the check engine light was on, but since having the motor scoped (miss in #4)...ALREADY CHANGED THE PLUGS) so coil is suspect now...or plug wires
 
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Old Oct 5, 2003 | 11:44 PM
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Could be a wire, I would try those first. If not, then the coil pack for that is probably bad.
Jimmy
 
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Old Oct 5, 2003 | 11:48 PM
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but pretend that i had the plugs changed, but ned to change the coil by myself......... could you tell me how to go about doing that. where do you uncouple the wires ? is the one small bolt holding the cover the only bolt ? does it just clip onto the top of the spark plug or are they attached in another way ? .........what do i need to know to change coil #4 to keep from screwing something else up ?.........
 
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Old Oct 6, 2003 | 07:07 AM
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I had a similar issue once with my 1987 F-150, turned out that the transmission needed servicing. After I changed the transmission filter and fluid, the problem went away.
 
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Old Oct 6, 2003 | 12:10 PM
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Frozen guy,

Just had the exact issue on my 98. They changed the coil and it runs fine. Cost me $160 to diagnos and change at my local dealer.
 
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Old Oct 6, 2003 | 06:17 PM
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It should just unplug from the coil if you don't have plug wires, unbolt it from the intake and twist and pull it up out of the plug pocket.

Jimmy
 
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