Bad Engine Shake??? HELP!
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Fleet Mechanic
Joined: Jan 2011
Posts: 1,793
Likes: 74
From: Richland, WA
Not yet. Probably the next thing I should do.
Yeah, that's exactly how it is. But I know it's not normal because I can jump in my truck and there's nothing. 
You can see the engine rocking pretty good (relative to the body), so I'm thinking it might be a good idea to change the engine mounts. Certainly couldn't hurt.
My truck does the same thing. Sitting still in neutral, I can bring the RPMs up to 1100 and it shakes the whole truck. Like you said, not a rattle your teeth shake, but it shakes the whole truck. I just did Stage 2s, T500 and a chip. Had this problem before all that. Did those mods, it ran good for two days, then right back to the same crap.
You can see the engine rocking pretty good (relative to the body), so I'm thinking it might be a good idea to change the engine mounts. Certainly couldn't hurt.
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Fleet Mechanic
Joined: Jan 2011
Posts: 1,793
Likes: 74
From: Richland, WA
Yes we did, but it had no change on it.
Hotshot
Joined: Dec 2005
Posts: 14,376
Likes: 605
From: evansville in
bap sensor causes what problem? I forget. tps signal steady at the offending rpm? just throwing things out there. I am really worried about figuring this out as now two have the same problem!
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Fleet Mechanic
Joined: Jan 2011
Posts: 1,793
Likes: 74
From: Richland, WA
I'm thinking we need to change the engine mounts and maybe the tranny mount too. I crawled under it yesterday with the engine at 1100 rpms and you can see the engine vibrating a lot more than the frame. If you look at the tcase tail housing, it looks like a dog wagging its tail! 
At this point, I'd say that I'm better than 90% confident that the issue is mechanical and not electrical.
Hey Bill, do you know how old your engine and tranny mounts are?
At this point, I'd say that I'm better than 90% confident that the issue is mechanical and not electrical.
Hey Bill, do you know how old your engine and tranny mounts are?
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Fleet Mechanic
Joined: Jan 2011
Posts: 1,793
Likes: 74
From: Richland, WA
I still haven't checked the UVCHs yet, but like I said, I'm almost certain it's mechanical and not electrical. I think the one misfire we had test driving it was due to a combination of the new injectors (air in the HPO sys) and low fuel pressure. I took it for a longer test drive after getting the fuel pressure back up and didn't have any issues.
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
My engine and trans mounts are the original I suppose. I was convinced my problem was mechanical too, but I'm not so sure now. I think I'm making some headway on figuring this out. I don't want to jinx it though LOL! I'm going out to the shop now and work on it. Check those UVCH !
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I'll see if I can check at least one of the UVCHs tonight.
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
I could have missed it after reading through this, but I did not see you mentioned trying to unplug your chip? I'd give that a shot...even in the ol cummins and 7.3's I'd say 50% of the problems we see are chip issues. Give it a shot...
sorry buddy...I keep thinking about it..
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