hey if i have a s4 t2 motor and i am using an s5 harness will it cause a problem and couldnt i run a s5 ecu and could someone tell me what premix is please

 

first, are you swapping a t2 s4 into a t2 s5 car?

second(if the above is true), the s5 ecu will run in limp mode due to lack of electronic Oil metering pump

3rd, premixing is commonly referred here when you mix 2-cycle oil in your gas to compensate for lack of the stock OMP.

 

no i have allready built the car but i found out that the harness is from an s5 so the car runs but i was wondering if the s5 harness is goin to mess something up

 

Ok, let me rephrase.

Was your car originally s4 or s5?

 

s4 gxl