Hi,im new to this site.i swapped my 1990 si crx engine for a D16A9 engine.
Told it should be a straight hassle free swap. The car is ticking over very uneven,
misfiring when revved,with a lot of black smoke.the l.e.d. in the passenger footwell
read fault seven.throttle position sensor which has been reset and hasnt returned.
we swapped the throttle angle sensor for a vtech one but it didnt make any difference
to the running. The ecu shows no fault now, but yet it is running very rich, drinking petrol,
black smoke, misfiring when revved even at 2500rpm. What can the fault be if it doesnt show
up on the ecu?

 

stuck injector? try pulling injector wires. the idle should change noticeably every time you pull one. if you pull an injector wire and the idle doesnt change you found your problem.