So I´m using the Haltech PS1000 and lately my CAS signal have started to get funky when the engine gets hot. While cold it runs fine during acceleration. But when the engine gets hot and I accelerate the car runs badly, and according to the data log it is losing rpm signal.

What could cause this? Bad sensors? I switched the sensors with each other with no result. Re-did the connectors on the plugs. Insulated the wiring with aluminium foil and also made sure the shielding wire was grounded.

I have seen two different wiring diagram for the CAS. One says (-) on top of the connector, and one says (+) on top of the connector. Im currently wired with (-) on top which I guess is right since the car ran perfectly fine before.

Thanks
Kalle

 

with a stock car, the wiring is usually the problem. so if you're using the Mazda harness that would be the first place to look.

the way to check if you have the correct polarity would be to lock the timing to something and rev the engine up, if you have it wrong timing will change

 

Im using new Haltech harness. Will try checking the timing while locked, thanks!

 

Another thing is that resistance usually increases along with temperature. Also, the clearance might increase with heat. If the sensor is a little bit too far from the rotating disc, it might work cold but not hot. So check the clearance.