06 bucking at 40 in o/d

[tdavid13]

I have an 06 expedition that bucks at 40. If I let off of the gas and then on it will do without bucking. When it starts doing this, I turn the overdrive off it goes away. Someone here said to replace the plugs. Would that fix it? I would think that the O/D wouldn't have an effect on the plugs, but maybe I'm wrong. Tranny issue?
It has 122k, might be original plugs I don't know
Thanks for ideas/thoughts

 

[R W Carpenter]

I had this issue on an 06 of mine a couple of years ago. Started with the shotgun method and replaced individual spark plugs as they got bad enough to trip the check engine light. They would eventually go bad again. Got tired of this happening every few months so I finally took it to a mechanic that I trusted. He suggested replacing all plugs and coils at a cost of a little over $1000. I figured what the hell and went ahead and let him do it (I didn't want to chance breaking one of the dreaded two piece plugs myself since he said he would take care of it at no extra cost if it happened while he was doing the work). Once the work was done, the truck ran like a charm for the next year and a half until I hydroplaned on the freeway and hit the guard rail and the insurance company totaled the truck. Up to you but if I were you and had the money to spend this is the route I would go.

Others might have other opinions and I am sure will chime in at some point.

 

[1955moose]

Bucking is most always electrical. If your throwing any codes, try just replacing that coil. Usually what happens is a coil gets wet from a coolant leak near that hose dripping. If your going to change all 8 coil's, go with Motorcraft ones available online. Dealer Ford ones are $80.00 each, online about 2/3 less.

Sent from my N9131 using Tapatalk

 

[BRIANGEE]

Scan tool with mode 6 capability: generic OBD2 function $53: Misfire counters with our without codes being set. Otherwise you're just playing parcheesi.