I am having an issue with my #1 cylinder missing after the car is warm, I get no codes for it but sometimes car goes into limp mode with a solid check engine light with the jumper jumped to read codes, turn the car off and turn it back on and it’s no longer in limp mode. Car has new timing belt, head gasket, spark plugs, distributor, and rotor in the distributor.

 

Car? stock? mods?

What makes you believe cyl #1 is missing?

Code zero indicates the ECU has a power or ground issue or is bad.

 

Car is stock. I can pull injector plug or spark plug wire and it doesn’t change the way it runs. I don’t really know what ground to check other than possible battery ground. Trans ground looks to have never been taken off, and valve cover ground is fine.

 

But is only when car gets warm

 

Battery isn’t correct battery, I did pull the ground cable off when I was putting the stock head back on(someone had tried the mini me swap with a z6 head and I felt It was better to stay stock at first) and have had this issue since.

 

Do a compression check. and check the Injector on that cylinder. If there is no change when you take off the spark plug wire and its firing, then its either your compression or fuel on that cylinder.

 

The injector is good. Still the same even when I swap the injector. But only when car is when when it does it which is what baffles me.

 

What year and engine does your car have. Automatic?? Vtec? Etc

 

Check your valve adjustment. That cylinder could be slightly too tight and when cold function properly, but when the engine warms up, the materials grow and can push the valve open slightly losing compression in that cylinder creating the miss that you have described here.

 

Disconnecting a spark plug with the engine running is an extremely efficient way to blow the ignition coil.

Check whether Cyl 1 spark plug has bright white spark when the engine misfires.

A disconnected valve cover or battery ground would not throw code 0, but an intermittent poor connection at the trans or thermostat ground could.

An intermittent poor connection in a wire harness connector affecting power or ground to the ECU would also throw code 0.

 

Car is a 1995 Civic. Its automatic with a b15b7

 

Do you know the specs for the adjustment? And procedure for doing so?