Engine/Transmission (1998.5 - 2002) Here is a new problem

[Texas Diesel]

01, HO, 6 speed. Van Aaken & Edge, OEM injectors.





On really cold mornings (25-30F), only while coasting down hill the truck "bucks". Just like a bad miss in a gasser.

This goes away after 10 miles.



Since I am coasting there is no fuel being injected.



It was suggested that a tight (soon to fail) u-joint could cause this.



Any ideas?

 

[GIT-R-DONE]

I doubt it would be a U joint, and then go away. I had a truck that would do something like that only when I let out of the throttle. U joints were bad. But, it happened every time... .

 

[keimmmo]

I hope for your sake that I am wrong, but that sounds EXACTLY like the symptoms I had just before the last VP failure. It did wierd things once in a while for several months, but no codes. A few days after it started "missing", it set a code. I don't remember the exact wording, but it was an internal timing failure... something electronic. Keep checking for codes... you probably will get some soon.



Steve Keim

 

[Texas Diesel]

hmmmmmmmmmm. I'll keep checking codes then.

 

[ToolManTimTaylor]

Could be time to change the trans fluid? I am guessing that when cold the fluid is thick (Duh) and is not meshing thru the gears like a warmer fluid would. That may be causing a condition that may resemle a fluid backlash effect?

 

[Texas Diesel]

transmission fluid changed 12k ago. Definately something worse than thick oil.