'06 cold vibration / stutter

LR Mike · May 23, 2006

Just got done with the run around on this one:

'06 F-250, 4x4 Auto, 6.0L (of course, 6000 miles.

When the truck is cold there is a very distinct vibration or stutter at around 45 - 50 MPH. Basically as soon as the trans shifts to OD and the TCC engages it comes right in. Drop out the TCC or pop it down a gear, gone. I took a number of recordings, and the problem is definately in the motor - you can actually watch the RPMs dither, as well as the ICP and IPR.

I replaced the VGT solonoid and supply tube, as per hotlines recomendation (Zinc contamination), and no change.

If I take control of the IPR, the VGT, etc. nothing changes unless I bump the IPR up 1 notch.

EGR is 0% during the entire event - too cold?

Finally I tried 2 other 05 / 06's we had here (4K and 22K miles) and they both also seem to have the condition? The newer truck not as bad, but the TCC isn't kicking in the same on it, adaptives aren't set apparently.

I shipped all the recordings to Ford, with their final thoughts that it is a normal condition.

I suppose I should just take them at that, but I've never had anyone complain of this before - mostly just curious if this is elsewhere? /forums/images/%%GRAEMLIN_URL%%/shrug.gif

Thanks guys!

Jwebb1981 · May 23, 2006

Fords Normal Condition = They don't know what is going on or they don't have a answer. /forums/images/%%GRAEMLIN_URL%%/laugh.gif

LR Mike · May 23, 2006

Fords Normal Condition = They don't know what is going on or they don't have a answer. /forums/images/%%GRAEMLIN_URL%%/laugh.gif

Exactly! A little hard for the customers to take, though!

HGM · May 30, 2006

Just a thought...... Have you unplugged the ICP and driven it to attempt to duplicate? What RPM does it happen? If your in the 1800-2400RPM range and unplugging the ICP doesnt help, its probably check valves..Unplug one bank(ICP plugged back in) and drive it again, monitoring ICP, RPM an IPR(zoom in) to see if it still shows really erratic ICP.. If so, the bank thats plugged in is your bad side, if its smoother, the unplugged side is your problem..

LR Mike · June 2, 2006

HGM - RPMs are low, around 1100, and only with TCC locked, high gear, cold. I haven't unplugged the ICP, but have taken over the IPR with IDS with no result, unless I bump it up a little.

I like your method, though, but I think my RPM range is a little low. Back with the customer for now, anywy, so we'll see what happens!