Hi,

On my 1991 Honda CRX Si (fuel injected), after warm up, the car misfires and idles during acceleration below 2500 RPM (above it is normal). I have been troubleshooting this for a while and would like more input. Here are the parts that I have replaced for this issue:
1. Fuel pump
2. Spark plugs
3. Fuel filter
4. Air filter
5. MAP sensor
6. Vacuum hoses to the MAP sensor
7. ECU

I have also checked the resistance to each of the injectors and they are all 2.2 ohms (within the FSM spec of 1.5-2.5 ohms).

I plan on next replacing the fuel pressure regulator and cleaning the injectors.

I am wondering if I am missing anything obvious?

There are no check engine lights and the ECU is not throwing any codes.

Any help is much appreciated.

Thanks!

 

Did you check the valve lash? Sometimes if it is too tight you'll get misfires especially on the exhaust side