Shudders
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Joined: Aug 2007
Posts: 610
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From: NE Kansas
Shudders
I noticed a bit of hesitation, shuddering when accelerating. I can't yet decide if it's engine or trans related. 230k miles. I use Marks tranny flush every 30k. Last done about 10k ago.
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Joined: Aug 2007
Posts: 610
Likes: 20
From: NE Kansas
My code reader doesn't seem to have a way or if there would be a fault there are none.
Driving it around just seems to me weak engine. Plugs are way overdue, so going to dive in this weekend.
Driving it around just seems to me weak engine. Plugs are way overdue, so going to dive in this weekend.
Tuned
Joined: Sep 2018
Posts: 385
Likes: 19
This might seem way out there for some people and it really is for me too.
My 00’ v10 ex occasionally has a miss that shows up during driving that feels like your going over bumps In the road that aren’t there. It’s a slight low power feeling like the trans has an issue but if I can listen closely it’s the motor missing just a little. It tends to be not hardly noticeable at idle but one time it showed up it was close to home and when I got there I pulled all the coil wires one at a time. I could not tell a difference which one was worse.
My fix, while driving and of course on a straight section of quiet road put truck in neutral, turn off ignition, wait till motor is completely stopped turning and restart. Put back in drive and continue driving as normal. It’s so odd to me because I know there really can’t be any sensor that really resets during shut down.
You could do a spark drop test and then an injector drop to see if you can identify the problem cylinder.
My 00’ v10 ex occasionally has a miss that shows up during driving that feels like your going over bumps In the road that aren’t there. It’s a slight low power feeling like the trans has an issue but if I can listen closely it’s the motor missing just a little. It tends to be not hardly noticeable at idle but one time it showed up it was close to home and when I got there I pulled all the coil wires one at a time. I could not tell a difference which one was worse.
My fix, while driving and of course on a straight section of quiet road put truck in neutral, turn off ignition, wait till motor is completely stopped turning and restart. Put back in drive and continue driving as normal. It’s so odd to me because I know there really can’t be any sensor that really resets during shut down.
You could do a spark drop test and then an injector drop to see if you can identify the problem cylinder.
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Joined: Aug 2007
Posts: 610
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From: NE Kansas
Those are my symptoms. Nothing noticeable at idle. Cannot really tell on gravel roads, but going 50+ uphill it becomes evident.
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FTE Chapter Leader
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From: N. IL
x2 and IMO typically won’t throw a code.
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Joined: Jul 2010
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From: Media PA
Do a set of fresh Motorcraft SP-479 plugs and new boots and springs. Be sure to install to 26/30 ft/lbs on the plugs and that shudder should be gone.
Moderator
Joined: Jul 2010
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Likes: 1,549
From: Media PA
Yes, your '00 only has about 3 or 4 full threads for each spark plug, that's why you want to go with a higher than spec (11/17 ft/lbs if I recall correctly) torque as that higher torque will help to firmly seat the plugs with much less chance of them working loose and blowing out. Tests have been done up to and a bit over 100 ft/lbs and the plugs broke before those 4 threads stripped out.
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Joined: Aug 2007
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From: NE Kansas
Replaced all 10 with the MC plugs. Trusted that those springs went on! Passenger back 2 are fun. Furthest is blind. Used 11" gearwrench swivel magnetic plug socket. Have the 3pc set but this one did them all. This or similar is a must. Had to add 1" extension to get torque wrench onto back passenger. Torqued to 25 ft lb
Now I think I still feel a light shudder when it downshifts the first time. Old plugs were real bad. Gap 2x or more than the new. Should have replaced years ago. 4h job. I didn't add pb blaster. Just blew out with compressor blower nozzle and plastic tube (one from garden sprayer tank was perfect). Blew it once across all, then each as I replaced. Removed coil and blew out hole. Loosened nearly out, blew again. Tried to guide new plug back in without slapping around. Passenger back 2 are cross your fingers, close your eyes, and go.
Springs looked fine but probably should have did boots. I didn't.
Could one of my cops be bad? Reading that a bad cop can cause this. Any suggestions on how to identify the bad ones?
Now I think I still feel a light shudder when it downshifts the first time. Old plugs were real bad. Gap 2x or more than the new. Should have replaced years ago. 4h job. I didn't add pb blaster. Just blew out with compressor blower nozzle and plastic tube (one from garden sprayer tank was perfect). Blew it once across all, then each as I replaced. Removed coil and blew out hole. Loosened nearly out, blew again. Tried to guide new plug back in without slapping around. Passenger back 2 are cross your fingers, close your eyes, and go.
Springs looked fine but probably should have did boots. I didn't.
Could one of my cops be bad? Reading that a bad cop can cause this. Any suggestions on how to identify the bad ones?
Fleet Mechanic
Joined: Mar 2019
Posts: 1,293
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Yes it's generally the coils that cause it. I would suggest just replacing them all with Denso and be done. In the grand scheme of your time and the cost its pretty inexpensive to replace them all.Some folks will buy one and move it around to identify the cylinder or use forscan or a similar tool to look at misfire counts on each cylinder. The ones with the highest misfire counts are the ones to replace.
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Joined: Jul 2010
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From: Media PA
If your old plugs were worn out to almost twice the spec gap then your rubber boots are most likely the source of the miss/shudder now, those boots live in a very harsh environment and they do wear out and develop tiny cracks that let the high voltage dance around and that will cause a miss. Of course if you do go with a fresh set of the Denso COPs they come with new boots and springs, otherwise you could just buy the Denso boot set and throw them in.
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Joined: Nov 2010
Posts: 30,593
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From: N. IL
A few years back cops were expensive, so replacing all 10 was a hefty sum, now they’re much cheaper. Just stay away from the cheap, off brands; 1/10 are bad off the shelf. I think I’ve replaced 3 after 21 years, but I’m cheap and have plenty of time for testing, wrenching, and sipping suds. 
Good luck with your adventure!
Good luck with your adventure!