Funny Idle

[pacotaco345]

Hey everyone, I just got a speed sensor for my car (91 240 w a 5spd swap) and now the idle usually stays around 1200 rpm's. I still have the automatic trans ecu in the car. The thing is every once in a while the idle will drop down to 700, where it should be.. And before I installed the speed sensor the car always idled fine. Any advice?

[Okinawandrifter87]

I'm gonna assume its KA and not SR. On that note, first off, did you touch anything else besides the speed sensor or knock anything loose or not put something back?

[pacotaco345]

Ya its a ka, sorry for not specifying. And no, the only thing I touched was the speed sensor.

[bb4_96]

It idled fine after the swap but not after you hooked up the speed sensor?

[pacotaco345]

It idled fine after the swap but not after you hooked up the speed sensor?

ya, it was fine before

[Tantwoforty]

un plug the sensor and see what it dose
pull the ecu codes for kicks, it should throw a vss code but see what else it says.
just somewhere to start looking :/