Noticing engine hesitation
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Senior User
Joined: Nov 2004
Posts: 469
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From: Independence, Missouri
Noticing engine hesitation
Hey guys. Thought I'd run this past some people. My 01 V10 Excursion has just turned 80,000 I bought it last year (May) at 68,000 miles. I've noticed that say I'm just driving it normal speeds with just maintaining a constant speed that the truck will kind of "buck" or "hesitate" If I am pushing on the gas hard to accellerate there is no problem. What do some of you guys recommend?
I do not know the history of this truck so I'm guessing I need to probably start to replacing some things such as fuel filter, plugs, the standard equipment. Just wondered if anyone has had the same issues.
I do not know the history of this truck so I'm guessing I need to probably start to replacing some things such as fuel filter, plugs, the standard equipment. Just wondered if anyone has had the same issues.
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Senior User
Joined: Nov 2004
Posts: 469
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From: Independence, Missouri
sorry. forgot to mention that my engine light is NOT on. After driving it quite a bit this weekend I noticed that it now hesitates/bucks when pressing the excellerator as well. Since I work for a AC Delco and Motorcraft warehouse I'm just gonna pick up a new fuel filter, plugs, wires. Easier to try that stuff before I take it to my mechanic. I did purchase a 24 month warranty with the truck last may. Figured I'd replace the stuff that they will claim it to be if they have to look at it. Last week I replaced my wifes fuel filter on her 2000 Expedition and then took it to the Valvoline oil change place up the street. They changed the oil and then said to me "Looks like you are in major need of a new fuel filter" lol
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Not bad idea about changing the fuel filter.
If you're gonna change plugs order 10 new COP (Coil On Plugs...V10s don't have wires) and new boots. My guess is that you have one or more bad COP(s).
If you're gonna change plugs order 10 new COP (Coil On Plugs...V10s don't have wires) and new boots. My guess is that you have one or more bad COP(s).
Elder User
Joined: Aug 2005
Posts: 917
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From: Fort Lauderdale, Fl
Originally Posted by KCAutosound
sorry. forgot to mention that my engine light is NOT on. After driving it quite a bit this weekend I noticed that it now hesitates/bucks when pressing the excellerator as well. Since I work for a AC Delco and Motorcraft warehouse I'm just gonna pick up a new fuel filter, plugs, wires. Easier to try that stuff before I take it to my mechanic. I did purchase a 24 month warranty with the truck last may. Figured I'd replace the stuff that they will claim it to be if they have to look at it. Last week I replaced my wifes fuel filter on her 2000 Expedition and then took it to the Valvoline oil change place up the street. They changed the oil and then said to me "Looks like you are in major need of a new fuel filter" lol
KCAutosound is it like what I mentioned here?
https://www.ford-trucks.com/forums/5...rse-power.html
Monsta about how much does the COP cost?
Last edited by BAJI26; Sep 25, 2006 at 08:19 AM.
Lead Driver
Joined: Jan 2006
Posts: 7,308
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From: Hartford, WI
To check your throttle position sensor, get either a DVOM or a scanner to see the voltage. One wire will be reference 5V, the other ground and the thrid the voltage the ECM sees. You want to make sure that as you gradually increase the throttle, the voltage must be uniform. If your voltage drops off suddenly, your TPS is bad. Not sure about your specific vehicle but that is info from my other cars with TPS
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From: Independence, Missouri
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Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Sorry I didn't respond to your question for me. I didn't see it.
$32 sounds 'bout right!
Glad yer all up and runnin' better now! 
$32 sounds 'bout right!
Glad yer all up and runnin' better now!
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Senior User
Joined: Nov 2004
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From: Independence, Missouri
Argh!!!! I'm pissed. Changed all my plugs and replaced the #1 coil like the dealers $90 diagnostic said and still have the issue. Truck bucks at acceleration and misses at idle.
Elder User
Joined: Aug 2005
Posts: 917
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From: Fort Lauderdale, Fl
Originally Posted by KCAutosound
Argh!!!! I'm pissed. Changed all my plugs and replaced the #1 coil like the dealers $90 diagnostic said and still have the issue. Truck bucks at acceleration and misses at idle.
Freshman User
Joined: Sep 2006
Posts: 43
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From: Surprise, AZ
Make sure your COP and injector connectors are tight. I had a similar problem only to pay a shop $120 to find a loose connector. Also, did you put dielectric grease in the boot of the new COP? I found a seller on ebay that has the COP's for around $15. I replaced all 10 with new Motorcraft plugs and now she runs like new.
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