Overboost or trans problem
Thread Starter
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Elder User
Joined: Jun 2007
Posts: 705
Likes: 1
From: Sandia Park, NM
Overboost or trans problem
I haven't been watching the boost gauge, but it's kind of hard to build boost at this altitude. I have thrown the SES light on overboost before but backed out too soon to really pay attention to how the defueling feels. When I accelerate now the truck takes off fine but slows down quite a bit on the top end of 1st. The 2-3 shift slams hard a lot of the time. Is the slowing overboost, trans, or torque converter? How can I test these? BTW, I cannot get the SES light to come on here at altitude. I read that some trucks defuel w/o the SES light? I have AutoE as well, so is there anything I could do with that to see what's going on?
Thanks!
Thanks!
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
Can't help you buddy, but here's a bump.
For what it's worth, I've only thrown the SES light a couple times living at 5600' of altitude in Colorado with my truck, DP tuner, etc. I do have the boost dumping (I need the boost fooler thingy). My tranny doesn't behave like you are describing so can't help you there.
For what it's worth, I've only thrown the SES light a couple times living at 5600' of altitude in Colorado with my truck, DP tuner, etc. I do have the boost dumping (I need the boost fooler thingy). My tranny doesn't behave like you are describing so can't help you there.
Thread Starter
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Elder User
Joined: Jun 2007
Posts: 705
Likes: 1
From: Sandia Park, NM
The strange thing is that it only does it in 1st gear. It almost seems like I don't have a 2nd gear. In 80econ it takes off fine. I think it is a shift at 3K rpm then it drops back to around 2700 for a few seconds after what I think is a shift in to 2nd. That is where the power loss is. After a few seconds I get another shift into 3rd? and the power is great again. Just that one dead spot after I take off. Any thoughts? I looked at the AE pdf files on RHN last night and I'm going to try a couple of those tests. Will post findings prolly this weekend.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
I didn't know that you had a programmer on it. Now that I know that, all I can tell you is that I don't diagnose problems when a programmer is on the truck. I have no idea what they do, but in my experience they often cause problems.
