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Old 06-08-2011, 12:07 AM   #1
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Default 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
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Old 06-08-2011, 05:36 AM   #2
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Calibration:
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Key on: 100% TPS at WOT, nice smooth sweep
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Engine running: ~50% TPS at WOT, nice smooth sweep
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Datalogs included. Um. Help?
Attached Files
File Type: msl 2011-06-08_08.28.15tps.msl (671.8 KB, 78 views)
File Type: msl 2011-06-08_08.31.54tpsengoff.msl (47.6 KB, 72 views)

Last edited by Greg G; 06-08-2011 at 05:49 AM.
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Old 06-08-2011, 06:00 AM   #3
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You normally drive with the engine on, right?
Just calibrate it that way
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Old 06-09-2011, 05:36 AM   #4
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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!

Now that the TPS is working...uh what do you guys think of my acceleration enrichments? And yup I ran out of injector...
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Old 06-18-2011, 02:37 AM   #5
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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://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:


Then used the cover for a stock look. Once testing is complete, you could even solder the wires to the stock connectors
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Last edited by Greg G; 06-18-2011 at 02:48 AM.
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Old 06-18-2011, 10:56 AM   #6
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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.

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Old 06-18-2011, 11:16 AM   #7
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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? Clearance for the wiring?
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Old 06-18-2011, 12:01 PM   #8
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shaved the tabs down.
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