performed swap in 90 crx over to 93 si motor since this was done i have had codes 4 and 41. im not sure what to do to check or repair them also have problem with motor wont rev up past 3500 rpm could that be related. im a chevy tech this is my first import swap and probably wont be the last. please help me.

 

tried to switch cylinder position wires still the same problem

help?

 

i believe it's what they call "limp mode" or safe mode. try fixing the codes first and you should be on your way. there's a couple of posts about the same problem you're having, try searching for it cause im not sure which posts they were.
oh yeah, make sure you have the proper ecu also.

 

Primary Oxygen Sensor - Heater 41
CKP Sensor (Crankshaft Position Sensor) 4
Try changing the o2 snsor and that should tell you if it is a bad o2.
4 I have no clue. But 41 has nothing to do with 4. Could be an ecu though try changeing the ecu first. Is it a chipped ecu or reg ecu?

 

its chiped maybe a new chip?

 

could be a bad ecu

 

i highly doubt its his ecu, its wiring problems is what it is...

 

yeah i think we wired up the dx engine harness side plug wrong to the obd1 dizzy