sr20 constant misfire.

[swatteamtimmah]

Let me begin by stating that i have been having this issue for almost 3 weeks. I have scoured the internet for answers and i havent found anyone with a similar problem...

Ill try and supply as much pertinent info as i can.

Motor is a s13 sr20det in a s14.

I was driving my car around one 2 weeks and out of no where it just started to misfire, and fire only on cylinders 2,3, and 4. No matter what RPM im at, it still misfires constantly on cylinder #1. I pulled the ECU codes and im throwing, 13(Engine Coolant), 21(ignition signal) and 34(knock sensor).

I replaced the ECT sensor and Power transistor unit(ignitor) and that didnt resolve the misfire.

Misfire is constant whether engine is hot or cold.The injectors are ALL good.Im getting spark to all 4 cylinders.

The thing that puzzles me is how it just started to misfire out of the blue while i was driving around.

Could my camshaft position sensor cause a misfire such as this?(tho i dont know how it would get thrown off)

[Hijacker]

A bad CAS will usually affect all cylinders. I've rarely seen them affect just one. I would look at the ECU and see if you can't borrow a friend's.

[swatteamtimmah]

Im looking into finding a new ECU now, but could a ecu just go bad like that?