Tps

[walmor]

Ok, here is MY TPS problem (question). My 91 started dropping out of overdrive on a regular basis. I did everything to clean it up, elect. spray, blow dry, etc. Finally replaced at a cost of 175. 00. Reset the voltage to 1. 0 and roadtested. Would not go into overdrive normally until after 60 mph. I then started from . 65 volts and slowly worked my way up to 1. 5 with the exact same success. I then reset it at 1. 0 and the overdrive works fine if I let up on the throttle until it shifts and then re accelerate. This is unacceptable especially in traffic. What does that sound like to you? ANYBODY!

Except for the need for speed and related alterations, there seems to be certain problem areas with these trucks that could be put into groups that would address any problems in these areas.

Such as TPS, Warning lights on dash, poor brakes, Speed sensor, and Rear seals. These items and maybe a few more are constantly coming up on the Forum. You would think we would have every possible fix at hand. Not just archived complaints but absolute corrections.

Thanks for listening: Walt Morton

 

[BushWakr - RIP]

HI Walt,



First let me say I agree with you, and we are working on getting an FAQ as well as a "How To Do This" forum too... .

I assume that you didn't have these problems until the TPS started acting up right??



As for the TPS, try going down as far a . 45vdc and working upward to . 75vdc.

If that doesn't help, then you may need to make fine adjustment to your throttle valve cable.

Check the the throttle valve cable gap. It's on the throttle linkage cam. The gap at the back side should be approx . 180" (going by memory here). You can use a drill bit shank to check the current setting. Make note of were it is, then shorten it just a hair, to say . 160".

If you follow the cable back to a mounting bracket you'll see that there is a locking tab on the underside of cable were it enters the bracket. Just pull the tab and adjust the cable end gap.

The shorter you make it the earlier the shift happens. Now, if you get too far out, you can cause slipping and transmission failure with prolonged use.

One other thing to check as well...

With the truck off, and trans. shifter in "P" crawy under the truck and see if the throttle valve lever is in the "full forward position". If not, it's a bit sticky and you can buy a "universal throttle return spring" and hook that to the lever/cable bracket to pull that lever forward. This must be in the full return position before you try adjusting the cable.

This universal spring I mention looks just like the throttle spring under the hood on the throttle linkage, except on end is left long and straight for you to bend as needed.

 

[RGT]

Has anyone tried bypassing the TPS and either hooking in a remote potentiometer, controlled by hand, or wiring in a fixed resistor to give a constant voltage( . 5-3. 5 vdc) signal to the PCM? it would not be as nice as having a correctly working system but might rule out the TPS as the problem with erratic 3-4/4-3 shifting. Could also be used as a temporary measure to allow use of overdrive... . with a potentiometer in the cab you could adjust earlier or later shifting depending on need.....

 

[walmor]

BushWakr, At this point I will attempt anything that sounds reasonable. Thank you for some other ideas.

Love the truck but hate all of the "little" things that go wrong with it. You remember when there were no Throttle Position Sensors? Overdrive was a two speed rear end operated by pulling a lever on the dash. The only "Anti lock brakes" were the ones that needed new shoes or a master cylinder? A diesel was what pulled a long line of boxcars on the tracks. As for "Warning Lights", the only time you saw a warning light was when you were about to cross those tracks.

Sorry, didn't mean to ramble.



Walt

 

[BushWakr - RIP]

:-laf :-laf



Walt, you have the single most necessary component for owning one of these... . a sense of humor...

Feel free to ramble, babble, rant, and rave anytime,,, after all, if we can't understand were you're coming from, no one can. :-laf



Ordinarily, with cleaning, and careful setting of the TPS, and the throttle valve cable you can clear up most of the common shift complaints. Make sure that all the connectors on the TPS, trans. etc. are clean and in good shape. Let's try to confirm no contact/connection issues as well.



Sometimes though, you are faced with internal valve body problems that need a pro to diagnose and repair properly.



If we can't get you tuned up and going here, I HIGHLY suggest you contact Bill Kondolay at: Call Toll Free: (866)-504-4002



This guy can make our trannies talk 4 languages on his lunch break.



For now lets see how you make out with a retry on the TPS settings.



RGT, I've never heard of anyone trying to bypass the TPS in the manner you describe. I suppose anything is worth an experiment or two... .

I have my doubts as to that method working though... the TPS output is not static, but rather, dynamic based on throttle position. The TPS works in conjunction with other inputs as well, including the speed sensor, the crank position sensor and others that are all fed to the PCM and acted on.

I'd hate to try the idea out and discover that I had cause internal problems requiring a major overhall... . but that is just my personal thoughts, and no reflection on your idea since I've never tried it. .



Bob.

 

[1lawnman]

walmor

i have had a 92 since it was new and all i have done is fight that tps i bought 15 new ones before anyone said you could clean them. i call, ***** and did every thing possable to try to get dodge to fix the tps no help from dodge i live on a curvey road and pull a trailer every day iam alwalys having tps problems i did buy a92 once that had the switch turned hooked up backwards . this semed to work better, but only when i was driving, because i would remeber to turn it off when i was frist starting off. but because i am not alwalys the driver i never switch the switch on my frist 92 truck

i still use this truck every day. its been a good one

277,000 miles but boy that tps!!!!!!!!!!!!!!!!!