Whizbang

after searching the junkard. I came across a bit of an issue... all of the automatic E30s i came across were three wire TPS units. So whats the deal with that. is there something more specififc to look for? I assumed they were all the same. I would run an automatic miata 1.6 Throttle body if i needed but im on the hunt for the BMW version.

after reading this

"You will need to source a linear TPS from the aftermarket or from another application. The easiest swap is probably a BMW TPS Bosch part # 0-280-120-402 from an auto E30 or E36, or Bosch #0-280-120-406 from an E32. Both of these should bolt on your miata TB w/o modification. You will need to adapt the wiring harness to accomodate. The BMW pinout is
Pin 1-black wire-5volt in
Pin 2-shielded wire-ground
Pin 3-yellow wire-signal out
Pin 4-ground
Pin 5-WOT switch
Pin 6-Closed switch
"

Thanks for the assistance. Trying to get this miata swap fired up here shortly this month.

Joe Perez

iTrader: (8)

Mine came out of a 7 series of mid 90s vintage

Cowpoke

The three wire TPS you're finding is most likely an opened/closed switch, not a potentiometer (which you need for a 0-100% TPS signal). Paste that part number (0-280-120-406) into eBay, be impressed by internets.

Whizbang

was hoping to avoid shipping and wait times since the pull a part is cheaper. i also need the pig tail. that said, ill go back to the yard today to do some more scrounging.

Matt Cramer

I'm not aware of any E30 six cylinder BMWs that had a linear TPS from the factory, manual or automatic. I think the later four banger ones may have been linear though.