TPS calibration woes
 

Installed a new tps today. *I still get the same issues as the previous TPS, which I though was a dud. *It calibrates well when key on, engine off. *When engine is on, I only get up to 50% tps at WOT.

Measured the 5v reference, it has no problems (measures 4.9-5v both at key on and while engine is running). *The ground wire seems ok. The signal wire though- something is pulling the voltage down when the engine is running! *

Engine off key on: *foot off- 0.1v; wot- 3.7v
Engine running: *foot off- 0.09v; wot- 2.55v

There is no pulldown resistor on the board (already removed it during the previous tps install attempt).

Ideas? Will post graphs and logs in a bit.

Greg

Calibration:
Attachment 188391

Key on: 100% TPS at WOT, nice smooth sweep
Attachment 188392

Engine running: ~50% TPS at WOT, nice smooth sweep
Attachment 188393

Datalogs included. Um. Help?

You normally drive with the engine on, right?
Just calibrate it that way :)

Well damn. It was the TPS wire! Must have some break in the insulation somewhere. I ran a new wire to check that possibility, and it worked! :facepalm:

Now that the TPS is working...uh what do you guys think of my acceleration enrichments? And yup I ran out of injector...
Attachment 188372

I got tired of looking for an automatic TPS/throttle body, or a BMW TPS. I figured someone must make a product that fits!

This is the TPS I used:

http://uk.farnell.com/productimages/...d/42420529.jpg

http://www.farnell.com/datasheets/26181.pdf

Fits right into the D shaft of the manual 1.6 throttle body. I dismantled the stock TPS and drilled holes into the plate:
http://img.photobucket.com/albums/v6...g/P1130364.jpg

Then used the cover for a stock look. Once testing is complete, you could even solder the wires to the stock connectors :)
Attachment 188133

hey that's the one i have have. i could never figure out which is was. i looked through ever single Wells one to try to find it again, didn't think of farnell.

http://www.boostedmiata.com/gallery2...2/CIMG1735.jpg

Manufacturer is Vishay, but the potentiometer part has Wabash on it. Got it from RS Online.

Why does yours look like it got chewed up? :D Clearance for the wiring?

shaved the tabs down.