shudder like problem

[Jackpine]

Originally Posted by not you

How do i do this, hex code and serial number . The cruise was not on and it was a flat road it doesnt do it all the time once with me with the wife driving and a few times with just the wife. Its not a tire issue because it would do it all the time correct?

Generally, that is correct - a suspension/tire problem should show up at all times at a certain speed. But, I found in my truck there were times when it was far more noticeable than at other times. I feel it was a property of the road I was driving on.

The "shudder" description is still bothering me. I interpret that word as describing a very rapid vibration - kind of like a "shiver" when you are very cold. Somehow, I can't visualize how anything in the transmission could cause this kind of rapid oscillation - but an unbalanced tire sure could. It would be a kind of "shaking" sensation that you'd feel in your seat, and if it were from the front end, you'd probably feel it in the steering wheel. As I said, it took about three tries to get my wheels balanced, and I had not thrown any weights - things just seemed to "change" as the new tires "broke in".

I'd expect something funny in the transmission to be a slower effect, and it would have kind of a forward/backward motion. I'd also be surprised to see it happening at 70 mph, unless the truck is under a slight load, perhaps climbing a hill.

I wonder if this could be a somewhat aggressive closed-loop fueling problem? The system there is constantly alternating between too rich and too lean to average things out at the proper stoich, and maybe it's "overshooting"? Just a thought, any experts want to give an opinion on this?

- Jack

[88Racing]

After looking at the hex code. The problem "might" require an update. But only Bill would know if this would be the solution. I put a note on the moderator's help board so that Bill will know about it.

That's all I can say or do.

Lars

BTW thanx for entering your info.

[not you]

The shudder like problem is like pulsating ,kind of like driving over those lines in the side of the road to warn you that you are going off . Its starting to do it more often now i noticed it when i went out last night but it was very suddle. Thanks for the info and letting bill know the problem. its nice to see how quick the responces are on here it would be nice if the rest of my day was like that . thanks again Shawn

[Jackpine]

OK - It's kind of hard to imagine without having experienced it. I am sure Bill knows what to do about it if he can just find a free moment.

- Jack

[88Racing]

If it seems as if its getting worse put it back to stock programming. See if the shudder happens then also.
May want to try and give them a call also leave them a voice mail if necessary.

Lars