I have a 94 Prelude VTec with Headers and exhaust. My friend needed to borrow my stock L11 ECU to state ref his H22 in his Accord so i was left with either his P13 or P28 Ecu. Both of his ECU left a solid check engine light on my car. I think the P13 is on it right now and it idles once in a while in neutral even when the car is warmed up with solid check engine light. Has anybody experienced this problem before? Help or advice is appreciated. Thank you

 

Retrieve the code from the ECU and that will more than likely point you to the issue at hand.

I'm pretty sure you can use the paperclip method to retrieve the ECU diagnostic codes via CEL flashes on the OBD1 Preludes. I would assume that it is done the same way you would do it with the Civic and Accords.

 

Yeah, I'll check it out this weekend when i have the time. It's checked the same way.

 

Code 41. Prob O2 Sensor or LAF failure. Can this be, cause i swapped the ECU? After i swapped ecu was the first time car backfired. This weekend after my friend's car get bar'ed, he will return the L11 ECU. Hopefully it was cause of the switching of ECU's. I'm not that good with cars, i stay bone stock =/