Keeps Jumping in and out of overdrive
 

i have a 93 w a 518 automatic trans, and for what ever reason it just decided to act up on my this weekend, the trans has been rebuild at somepoint in its life and is very clean, and just got a service a month ago, for what ever reason yesterday it would not shift into overdrive and when it did it would pop right back out into 3rd, i know the tps controls 3rd to 4th gear shift, any ideas?

TPS is bad or out of adjustment.

Tps delete all the way

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Like said, the TPS is either bad or needs to be adjusted. Does your speedo still work?

speedo never worked acuratley it always jumped around, what will tps delete do?

TDR shows you how to use a cheap tps instead of stock

how do you install the dnr customs tps the instructions are confusing can anyone show me pics?

Its very simple. Unplug tps, plug wires of tps delete into the connector in the order shown in the directions. Take it out on the road and turn the pot until overdrive kicks in at the desired speed.

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i have same problem where it acts fien one day and then next day it is in and out of OD and speedo goes out when it jumps out of over drive?? my guess is TPS is bad??

That sounds more like the VSS to me. There is a sensor on the side of your tranny, that's the VSS. Sometimes if you just unplug it and clean it everything works fine, but it may need to be replaced.

i have had problems with a bad trans temp sensor. if i says it's under x degrees it wont let the truck go into overdrive, or in your case it bounces above and below this threshold making it kick in and out....

ordering a dnr customs tps delete saturday, ill let you know how it works out

It does sound like your TPS. You can check it with a volt meter. Put a paper clip in the back of the connector (middle wire) connect the positive lead to that then the negative to the neg side of the battery. Turn the key on but do not start the truck. The at rest voltage should be .6 - 1.2. Advance the throttle linkage and the meter should move to 2.25 and 2.75. I have a new TPS for sale. I switched over to the potentiometer due to the small plastic connector that is between the fuel pump and the TPS was worn and constantly causing my TPS to go out of adjustment. I found this out after buying a new TPS. If you are interested in the TPS contact me at jeffdavies500@gmail.com

can someone show me where the VSS is located on the tranny??

Vss is on the rear of the transmission. It threads in with a pipe fitting looking ring. Look one up on rockauto and you'll see what to look for. I just bought a new one because I lost speedo and last week it had been jumping in and out of overdrive.