I just finished swapping my '93 Del Sol Si. I put a B18B1 in it and I've been getting this weird CEL. Anytime I drive the car before it is COMPLETELY warmed and at operating temp, I get a CEL. If I let the car warm up all the way, no check engine light comes on. Also if I get the light, then shut the car off and then turn it back on, the light disapears... any ideas?

The motor also makes a backfiring noise then I let off the gas. Is this normal? It worries me becuase I have no idea what it is.

Thanks for any input!
-James-

 

what computer are you running? did you bother to see what code your getting? these things would help..
your "backfiring" problem could be exhaust related.. do you have a cat or just straight pipe?

 

The next time you get the CEL, let the car run and use a paperclip to jumper the service port. There are 2 connectors near the ECU, the smaller one with the brown and green/white wire are the service port. Then watch the CEL for the code.

read this..

https://honda-tech.com/zerothread?id=682412