Originally Posted by mysterync
(Post 1000682)
I feel pretty confident you have a tps issue. Its very common to have bell crank wear which causes erratic tps voltages.
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Originally Posted by JBearSVT
(Post 1000378)
Hmm. Well, I probably shouldn't, but right now I'm trying to rule out everything internal. Since the transmission is all new, and this problem was present before I put it in.
Do this a few times to verify that the numbers remain consistent. Wiggle the bell crank (the bell crank is the portion of the pump linkage which engages the tps and attaches the throttle cables and the pump linkage. The most common wear is up and down or back and forth toward the pump. Often we find the plastic bushings have worn allowing the linkage to move which effect the tps voltage. In some cases the wear is severe and wears into the bell cranks rod or bore which would require replacement. A pot is basically a used controlled variable resistor which allows you to trick the pcm into commanding lockup and od via a knob in the cab. I would recommend fixing the tps system but if funds are limited the pot will do the trick. Sent from my DROID RAZR using Tapatalk 2 |
This video is by one of the best diagnosticians and instructors I've ever seen:
This is by Dave Goerend and is an excellent visual representation of what I've explained Sent from my DROID RAZR using Tapatalk 2 |
i have the tps deletes on my site. the name of it is dnr customs. :hellox:
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Originally Posted by diesel pap
(Post 1000760)
i have the tps deletes on my site. the name of it is dnr customs. :hellox:
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So, POT is short for potentiometer? I've only heard them called TPS deletes. I put one in last year, hated it. Took it out. I'll never do it again. I really prefer to have it all work properly, as Dodge intended- which is to say I like it being variable, not locked into shifting at whatever it's set at. I realize it's still technically variable, but I don't feel like messing with it every time I accelerate under different loads/conditions than the time before. It also had other issues, wasn't working right, although I don't remember what they were. I just remember they went away when I went back to the stock/TPS arrangement.
Regardless, those videos were both great. And wow, I want a Verus. (while I'm dreaming, I'd also like this problem to fix itself, but I digress). So, the bell crank is the throttle linkage under the TPS? That makes sense. While I was messing with it to test the voltage, I don't recall there being any play or looseness in it one way or the other, I believe it worked very smoothly, but I wasn't looking for this so I will check it again when I get back to the shop where I left the truck. Thank you very much for all your time on this! |
So, trying to diagnose this was pretty frustrating, until we realized that the point of the frustration led straight to the problem- which was actually pretty stupid. Voltage readings on the TPS both for idle and sweep were erratic, getting the same reading twice was almost impossible. Turns out, this was because (even though everything looked fine on the outside) the wires were actually loose inside the plug on the pigtail side.
And come to find out, this pigtail isn't available from Chrysler anymore, and I didn't have any more luck at the local chain parts stores. A buddy of mine works for a Cummins distributor, and he wasn't able to come up with anything either, but when I took a picture of the plug he was able to dig through the inventory and find one that matched. All fixed, and the world is right again. Now if I could just get it to the body shop... |
OK, all was supposedly right. Overdrive works fine, but now it's stuttering on the 1-2 upshift. Bad. :argh:
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