I have a 00' SI and my cel came on. I scanned it and it came up with P0301, P0303, and P0300. There is a misfire in cylinders 1 & 3. I know that it does not have anything to do with the ignition. I was thinking maybe it could be a clogged fuel filter or a falty injector. Does anyone have any ideas on what else it could be?

 

but a tight valve will cause a random miss fire code since the air fuel is out of range if you have a live data stream on the scanner see what the map voltage is.
a fuel injector could be also but have not seen a fuel filter cause random miss fire yet.

 

I will check the voltage. Thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Handyman_1 &raquo;</TD></TR><TR><TD CLASS="quote"> I know that it does not have anything to do with the ignition. </TD></TR></TABLE>

Incorrect. If your plugs/wires/cap/rotor(all ignition parts ) are no good, you'll get a misfire. Try changing any one or all of those before you go tearing into the engine for no good reason.

 

I only said it has nothing to do with the ignition because I already changed the plugs, wires, cap, and rotor.

 

Weak coil or ignitor module

 

So I checked the injectors and came to the conclusion that they were fine. I decided to do a compression test. In cylinders 2,3, and 4 the compression is 165 PSI. and in cylinder 1 it is only 30 PSI. I was told it could be a worn lob on the cam shaft or a stuck vavle. What do you think?

 

i have yet to see a flat cam lobe on a honda but things happen. i would be looking more towards a tear down.

 

I was thinking more towards the valves rather then the cam lobes. This is hurting my head.