throwing a po300 and yes it is missing at idle and probably while in gear also.
the deal is at cold start it idles just fine no miss at all afr at about 15.5 16 which i think is high? then once it starts to get about half way warmed up it begins to have a random miss with afr jump to 17-18+and often accompanied with a p0300/ good plugs and wire new coils. any ideas would be great!

 

Read this:

https://www.evolutionm.net/forums/ec...0300-test.html

 

my car really has a miss tho, so i figure disabling the code will not fix my problem

 

Change thy plugs..and look for thy boost leak...as it was written..let it be done.

 

done and done

 

Is it fixed and fixed?

 

there is a TSB out there on the 5th gear syncro's causing the p0300 on the '03 and some '04 models. It could be that in the colder weather your getting this problem.

If it's not that then given your AFR values, I would also check the front O2 sensor to see if it's working correctly.

 

nope still got a junk idle

 

well its been going on forever and has nothing to do with weather if anything Ive noticed it seems alot better when it rains. its probably just me tho. ive gotten no codes for that. how do you test it?

 

You are throwing the P0300 at idle? That is strange. I hear about it during cruise all the time but not at idle...

Is the timing spot on? How old is the front o2 sensor?

 

yes its for sure at idle and probably when im cruising i just cant hear it when cruising . I'm not sure, I've had the car for 2 and half years and never messed with it. so probably oem from day one

 

The p0300 code is set when the ECU, reading the crank sensor, notices a variation. This could be caused by an actual misfire or by the drive train banging against the engine. The ECU then starts shutting off fuel in an effort to eliminate the problem. Hence your AFR changing.

A p0300 at idle in neutral has got to be a real misfire.

 

Whats your idle timing look like. Too advanced and it will trigger a P0300 at idle

 

i just got a tactrix 2.0 and have no clue what anything s but i think this is what you asked for?

 

Oh yea I bet that's your problem. Look down to 1250 rpm and out to 40 load in your timing map. Those 18's are pretty far advanced.

My car would def throw a P0300 with that much idle timing.

I'm guessing this was doe to tune for cams???