Bucking/Jerking

Reply Subscribe

Thread Tools

Search this Thread

Jul 7, 2022 | 04:43 PM

78Custom302

Thread Starter

Tuned

Joined: Oct 2020

Posts: 260

Likes: 12

From: Lakeville, MN

Bucking/Jerking

I finally got my truck running but I keep getting this bucking/jerking thing happening when I am decelerating, then it will often stall when slowing to a stop. It also gets worse as the engine gets warmer. I installed new plugs and wires, cap and rotor, and thought that would fix it, but it is still doing it.

Jul 7, 2022 | 09:29 PM

440 sixpack

Lead Driver

Joined: Oct 2018

Posts: 7,893

Likes: 2,371

Doing it on deceleration is odd. your timing might be horribly advanced, does it kick the starter when you crank it ?

Or it could be dying and restarting, that could be several things.

Jul 7, 2022 | 09:48 PM

78Custom302

Thread Starter

Tuned

Joined: Oct 2020

Posts: 260

Likes: 12

From: Lakeville, MN

What do you mean by "kick the starter"?
It's not dying and restarting, I know that.
The starter has spun w/o catching a few times...
Under a load and accelerating, it runs great.

Jul 7, 2022 | 09:54 PM

78Custom302

Thread Starter

Tuned

Joined: Oct 2020

Posts: 260

Likes: 12

From: Lakeville, MN

Has anyone heard of this:

ISSUE

Engine mis,spark knock,buck/jerk,surge and other drive ability concerns may be caused by induction crossfire.This occurs because of improperly routed spark plug wires.

ACTION

If spark plug replacement is performed, the correct firing order and spark plug wire routing is essential to prevent the possibility of induction crossfire between cylinders.Refer to the following procedures for inspection of spark plug wire routing and firing order.Properly reroute the spark plug wires if required.

Jul 8, 2022 | 09:46 AM

FuzzFace2

FTE Legend

Joined: Nov 2015

Posts: 30,935

Likes: 4,124

From: Angier, NC

Quote:

Originally Posted by 78Custom302

yes it is a thing thst could happen but with today's better plug wires and if good I have not heard of it happening as of late.
If you are getting cross fire through the plug wires replace them.
Dave ----

Jul 8, 2022 | 09:50 AM

beartracks

Lead Driver

Joined: Nov 2000

Posts: 6,635

Likes: 349

From: Albuquerque

Could be emmission controls related

Jul 8, 2022 | 10:18 PM

78Custom302

Thread Starter

Tuned

Joined: Oct 2020

Posts: 260

Likes: 12

From: Lakeville, MN

Quote:

Originally Posted by beartracks

Could be emmission controls related

can you say more?

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Jul 9, 2022 | 12:15 PM

78Custom302

Thread Starter

Tuned

Joined: Oct 2020

Posts: 260

Likes: 12

From: Lakeville, MN

Quote:

Originally Posted by beartracks

It's compicated, but maybe the smog air pump control if you still have it.

Do you mean the EGR valve? I’ve never heard of a “smog air pump”.

Jul 9, 2022 | 07:08 PM

#10

arnegrant

Tuned

Joined: May 2006

Posts: 304

Likes: 77

From: St Paul MN

My 2 cents

Double check the advance isnt sticking open

Take a quick look at the driveline components (brakes, etc)

Double check the timing with a timing light

Double check the plug wires are going to the correct cylinder

Check the plugs to see if there is anything off in one cylinder

Check compression

Throw a different carb on

Throw a different computer box on

Replace the distributor