when i drive my engine speed goes up and down, anyone know anything

 

Hold your brake pedal down slightly while you're going 55mph.

If the rpm goes up slightly, and doesn't surge up and down any longer, then your TCC may have been locking and unlocking. This can be due to the ECM getting poor signal from the TPS, VSS, CTS...

 

i'll try it in the morning but the only ones i know what mean are ECC and TPS and ECM what are the others, and what if it still does it?

 

coolant temperature sensor
torque converter clutch
throttle position sensor

let us know.

 

ok so i was driving down the freeway and did what you said, while i was doing 55 i let off the gas and pressed the brake slightly, no wierd speed, when i went back to the gas it started doing it again, tried this both in d and od. even did the same thing while pressing the gas and the brake same results, so wassup now any suggestions?

 

:oke:: :oke:: any comments, also i forgot to mention that i also smelled something similar to a clutch burning when i did this

 

Unplug the VSS plug at the tranny (4 wire square)

If it stops, then you know that the TCC unlocking & locking is your problem.

As to figuring out whether it's VSS or temp or whatever bad value to the ECM or wiring that's causing the problem, that's another story.

 

one question before i do, what exactly is the vss, been searching and it appears that it is my spedometer cable? is this correct? am i cutting anything else off when i do this. not questioning you i just like to know what i'm getting myself into

 

and where is the hookup on the trans, got a pic or maybe a side dir?

 

so i unhooked that 4-wire plug, one question before i drive to work tomorrow hopefully someone will respond, can i do damage to anypart of my car with the plug unhooked? and i thought the vss also controlled my spedometer?

 

Good news, i unhooked the vss from the tranny, no more problems. Just a few minutes ago i read that leaving it unhooked could cause it to burn out a 4th. Now the question is which is easiest way to check the system? Or should i just start replacing parts in order of easiest to hardest?

 

put a volts-meter on your TPS and see if it operates smoothly voltage-wise, and also maintains a consistent reading when held steady.

actually easier would be to plug a scanner in and check TPS and also the temp reading. And VSS reading.

Your VSS is in the tranny tailhousing; signal is fed to a DRAC which feeds the ECM, and then the speedo/cruise.

So grab a scanner.

 

cool i think autozone still does that for free

 

question, is what i read correct, can i lose my trans with the vss disconnected?

 

it adds heat w/ out lockup; 700s don't like that. Unhook it for diagnosis only; once you figure it's the solenoid, go ahead and change those parts ASAP.