tps problems

[Gravity Fed]

I had a haltech tps for a long period of time but have always had issues with inconsistant readings. With the accel wizard open and the car not running, i get varying readings of 0 %/s to 19.7 %/s. The moment the car is running, its all over the place up to over 150%/s at time, as high as 200 at least since i have had my threshold around there and it would still kick on. This is all without me touching the pedal. This is obviously kicking the accel enrichment on and makes the car buck and / or run lean.

I thought the tps was bad, replaced it with a OEM hyundai tps (had a d shaft so i went with it). Seems to be a narrower range than the haltech tps but i have getting the same problem with the readings (i calibrated it). the car is also immedately running worse, even with the tps calibrated...

Im figuring im getting some interference from the other wires in the system since all of the wires are ran through the same place in the firewall and i do not have shielding or shielded wire.

Any other thoughts? I have looks at my grounds several times, the voltage is constant to the TPS when the car is off. Ill have to check with it running. although i have heard that running too many grounds to one stop can cause problems.

i have been trying to figure this is out for at least a month and its rather fustrating.

[kjones6039]

You are on the right track IMO.

I would bet on a bad ground, loose connection (including a cold solder joint) or EMI.

Ken