2008 Expy transmission studders at 45mhp every time

ShawnV · #1 (**permalink**) 11-06-2011, 09:58 AM

I'm trying to help a friend resolve her issue with her 08 expedition. When driving the truck will studder right at 44-45mhp every time. If going up a hill it will slam, if on flat ground it will studder and if going downhill it's less noticeable.

She took it to the dealership and had them exchange the fluid and they don't know what it could be.

The truck has 125k on it and is otherwise in great shape.

thanks,
shawn

RI-Matt · #2 (**permalink**) 11-06-2011, 01:24 PM

Plugs and/or coils.

With 125K on it have they ever been changed? At 40-45mph the motor is under a good deal of load so it tends to show a coil or plug that is weak.

HTH
Matt

ShawnV · #3 (**permalink**) 11-06-2011, 05:55 PM

They have not been changed. I was trying to get her to change them back in April....

shawn

Tylus · #4 (**permalink**) 11-06-2011, 08:36 PM

I'd have her do the basic maintenance first. Then look for problems.