I have an xr2i race car. I am having an intermittent misfire but i feel like it’s actually the limiter momentarily cutting in rather than a mis.
I changed plugs leads coil pack etc to rule all this out. My question is... what tells the Ecu the engine revs? Crank position sensor?
what other things could it be?
tps? Edis?
running an after market ecu not ever had problems before this.
any other suggestions?
Thanks

 

Who fitted the aftermarket ECU? This person should know which signals are used!? Usually it's at least CPS, some also combined with a camshaft sensor.


Misfiring can have a lot of reasons. Wrong amount of fuel, wrong plugs, wrong leads etc. Oh and early EDIS were standalone systems... So it CAN be a rev limiter although you have an aftermarket ECU fitted.

 

TPS is a suspect the crank sensor tells ecu engine speed , i`d say try a multi meter on tps