TPS Question... Options

[MikeM]

Hi Everyone. I'm playing around with my 74 2.0 liter trying to get it to run a little better. It "bucks" occasionally so I was looking at the TPS yesterday. I couldn't get the TPS off to open it up,I think there may be locktite on the screws and I was afraid to really reef on it!! But I did try the 20 click test,but I heard no clicks. None!! What does this mean? Is the TPS not functioning at all? What would that do for driveability? I don't have much frame of reference as this is my first 914, but the car does seem to exhibit the ususal TPS problems. That is...it bucks, and the acceleration is sluggish.
Any and all comments really appreciated!!!
Cheers
Mike

[detoxcowboy]

Good morning, the 20 clicks you are trying to hear are your injectors not your tps, as the tps wears its internal armature drags across a internal printed circuit board and creates a groove in which little tiny specs of gold from the contacts get dragged in the groove and then this wear groove starts to make a connection between 2 of the contacts and when your armature (throttle) comes across this worn in unintend connection between the 2 contacts the TPS sends a confusing signal out to the ecu and the bucking starts.

good news is you can now get a new printed circuit board for the tps for about $35 and install it your self, but you have to get the tps off the throttle body..

someone will chime in wear to buy them,...

your can take the cover of the tps off without removing the tps, but it is easier to unscrew the 2 screws, sometimes screws on these cars can get stubborn, you can replace the screws but don't stript the threads on the throttle body...

bucking is common for worn tps..

here is the article on how to re-install the tps w/ proper calibration, whihc is really just the angle you screw it down so the interal contacts start at the idle position..

someone may provide a pic as well..

http://www.pelicanparts.com/techarticles/9...alibrate_20.jpg