Another problem.

[cherrington17]

i think you have the names wrong between pictures. the ring doesn't want to budge on the 52mm(and sticks out), and is seated nicely on the 62mm....

as with the tps removed. the orange ring one, looks newer hence.. 62mm.


maybe i'm wrong.

[[ion] C2]

Nope the 62mm one is the one with the weird immoveable ring. They're labelled right. The 62mm one has the RTV all over it from when we tried to make it seal better, and the 52mm one has the nasty looking interior.

[cherrington17]

hmm. wierd. your 52mm looks cleaner then the 62. (tps area, not inside)

[jabartram]

that ring is a shaft locking ring, it is designed to keep the shaft from moving if the butterfly is removed, that ring could be causing the tps to have a bad contact area when rotated, we run into the problem commonly in older diesel trucks, the shaft on the pedal wears out causing the tps to wear down one section of the potentiometer more than the rest causing the truck to stumble in that throttle position area.

[[ion] C2]

ZOMG

must be my problem

what can i do, i like my 62mm, can i use the same bushing and thing from my 52mm and transfer it over? i don't know how all that stuff is attached

[jabartram]

does the throttle shaft have excessive play on the 62mm? check the plate bore to see if there is a scarred are where the butter fly has been contacting it, i have modified t/b and pulled the butterflies for cutting shafts and mounting screws for flow, if the shaft and butterfly are set back properly it causes headackes.

[[ion] C2]

i heard it scrape sometimes when i was opening it while it was off the car during the pictures

[jabartram]

i woud venture to bet it has been disassembled 1 or more times, and has been misaligned. hold the 62mm up to light and look to see if you can see a bigger gap in one area between the butterfly and bore.

[[ion] C2]

the plate has some nicks in it, always knew that... but i just reinstalled it though lol

[jabartram]

you can try carefully tapping the lockring back into place to be sure the shaft doesnt wobble horizontily and it might help?

[[ion] C2]

FIXED
Maybe only temporarily until the throttle plate wears down the TPS again but what the hell.

Using the 52mm's TPS on my RSM 62mm, now my car is extremely responsive. The TPS graph is a lot higher per pedal position now. All graphs are nice and smooth. My theory of what happened is that the TPS was reading too low. The throttle plate was open farther than the PCM thought, so there was a lot more air coming in. It tried to compensate, but failed at times, where the lean spikes occurred.

So now that the TPS is reading accurately again, it seems to have a lot more low end power and wants to enter PE a lot more (since the TPS reads higher, accurate again).

Oil change is happening tomorrow (nearing 500 miles) and then I'm off to tuning the low and high RPM tables and seeing what PSI I can make now.

[cherrington17]

so after all the fuss... all you needed was a new TPS (possibly new TB) ??

[[ion] C2]

yeah lol

much like the other thread on JBO i had about my vacuum leak after the header install which ended up being loose intake manifold bolts.

some guy posts: "lol all that work and frustration"

[Alerosaint]

die gremlin die

[[ion] C2]

Yessir did a ton of testing today lots of driving and the issue was the TPS. Car runs beautifully. Needs a tune bad since everything was based off the old engine and crappy problems though.

Will be out tuning it later, but so far it's at 9.1 PSI. Feels a lot more powerful though.

[NickAlero2000]

nice!
break 10 PSI!

[billytheman1188]

haha, thats what you get when you think too hard Its always a simple fix but people think too much into it. I've done that a few times too Glad to hear its running good.....

[alerored04]

Congrats! That has to be a great feeling.