truck jerking when accelerating above 40 mph - Ford Truck Enthusiasts Forums

Go Back  Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Reload this Page >

truck jerking when accelerating above 40 mph

Notices
1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

truck jerking when accelerating above 40 mph

 
  #1  
Old 11-23-2009, 05:03 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
truck jerking when accelerating above 40 mph

I have a 2001 F150XLT 4x4, V8 Triton engine with offroad package that just rolled over 119,000 miles that just started giving me problems 2 weeks ago. When I accelerate at speeds above 40 mph the truck surges or jerks ( the best way i can describe it ) sporadically unitil I get to cruising speed. If I'm cruising at say 70 mph and go to pass some one and accelerate it does it again. The transmission feels like it shifts smoothly thru all the gears and there is no whining sounds, transmission sounds normal. There is no check engine light, so I assume a diagnostic check might not show anything. Advice from guys at work say possible ignition module, coil pack, transfer case ??? It never feels like the truck wants to stall and it never feels sluggish when accelerating like there is a fuel problem. So this being my first time on this forum, can somebody please help ??!! I am somewhat mechanically inclined but my trade is electronics. Any input would be greatly apprreciated, Thanks........
 
  #2  
Old 11-23-2009, 07:02 PM
projectSHO89
projectSHO89 is online now
Post Fiend
Join Date: Jan 2004
Location: St Louis
Posts: 14,721
projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.projectSHO89 has a spectacular reputation.
Low-grade misfire.
 
  #3  
Old 11-23-2009, 07:31 PM
cbradford's Avatar
cbradford
cbradford is offline
Post Fiend
Join Date: Dec 2006
Location: Lost in Pa.
Posts: 19,828
cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.
Yes I agree with project you have a miss, if the get's severe it will set a code and the CEL will come on. A scanner should be able to pinpoint the cylinder, good chance it maybe a COP.
 
  #4  
Old 11-23-2009, 07:55 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Thanks project and cbradford... your knowledge is greatly appreciated, it seems like when it rains it pours. Had a dead battery not too long ago that left me stranded, had an idling problem and had it fixed, and now this.... third time is a charm !!! And pardon me for my ignorance but what does the acronym COP stand for Thanks again !!
 
  #5  
Old 11-23-2009, 07:57 PM
cbradford's Avatar
cbradford
cbradford is offline
Post Fiend
Join Date: Dec 2006
Location: Lost in Pa.
Posts: 19,828
cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.
COP= Coil On Plug
 
  #6  
Old 11-23-2009, 08:03 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Thanks Chris...
 
  #7  
Old 11-23-2009, 08:09 PM
cbradford's Avatar
cbradford
cbradford is offline
Post Fiend
Join Date: Dec 2006
Location: Lost in Pa.
Posts: 19,828
cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.cbradford has a spectacular reputation.
No problem and you have 8 COP's one for each cylinder.
 
  #8  
Old 11-24-2009, 06:05 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Okay so I did a diagnostic check and found no malfunction codes which we figured would happen since I don't have a CEL and I found where the COP's are on my truck. A couple look like a pain in the rear to get to, and they look diffucult to get out especially with the hard fuel lines over top of them. Is it possible to find out if one of the coils are bad by reading them with an ohm meter ? And is there a good source to get a really good detailed shop service manual for my truck online.
 
  #9  
Old 11-24-2009, 08:32 PM
Built_Ford_Tough_757's Avatar
Built_Ford_Tough_757
Built_Ford_Tough_757 is offline
Senior User
Join Date: Nov 2008
Location: Norfolk, VA
Posts: 409
Built_Ford_Tough_757 is starting off with a positive reputation.
You can pick up a Haynes manual from Autozone / advance auto parts. It tells you everything about the coils how to test and replace.
 
  #10  
Old 11-24-2009, 08:39 PM
steve(ill)'s Avatar
steve(ill)
steve(ill) is online now
Post Fiend
Join Date: Jul 2005
Posts: 10,006
steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.
At 120 k miles you should be considering replacing the spark plugs... its time. When the COPS are off, look at the rubber end over the plug and see if one is swelled 100% oversize. that happens if they get antifreeze or oil exposure long term. That COP you might replace. You can get a full set of 8 on e-bay for $100. and just do all, or do a few and have some for later. IF you play with the truck, stomp on throttle, back off, stomp, etc, eventually you might get a code, then you know which cylinder. In the mean time, i would consider all new plugs.
 
  #11  
Old 11-24-2009, 08:46 PM
steve(ill)'s Avatar
steve(ill)
steve(ill) is online now
Post Fiend
Join Date: Jul 2005
Posts: 10,006
steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.
  #12  
Old 11-25-2009, 08:28 PM
Fordlover55's Avatar
Fordlover55
Fordlover55 is offline
Still kicking!!
Join Date: May 2003
Location: Kalispell, Mt.
Posts: 6,057
Fordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud ofFordlover55 has much to be proud of
I've got a 99 with a 4.6 and last year I had a very similar situation as yours. I don't have the COPs on mine, but what it needed was plugs and wires. Runs as good as new. I'm still looking at hitting 90,000 miles on her, but it's gettin' close.

That's the only issue I've had with the truck. I bought it with a tad over 24.000. Knock on wood!!
 
  #13  
Old 11-25-2009, 10:11 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Thanks for the info....
 
  #14  
Old 11-25-2009, 10:18 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Hey Steve thanks for the info and the nudging on just going ahead and doing some preventative maintenance. It is definitely time to replace the plugs and if I can get a set of COP's new at a good price then I'll replace them all. Everything you and other responses on here and everything I've read point to the COP's. And thanks for the link for the steps on replacing the COP's , I need all the help I can get !!
 
  #15  
Old 11-25-2009, 10:22 PM
goose4wind
goose4wind is offline
New User
Thread Starter
Join Date: Nov 2009
Posts: 15
goose4wind is starting off with a positive reputation.
Thanks Fordlover55..... words of hope you give me !! By the way, are those mountains behind your truck located in Utah ?
 

Thread Tools
Search this Thread
Quick Reply: truck jerking when accelerating above 40 mph


Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.