Hey guys i just wanna see what you think about this code last week i got a p0304 so i when i got all the new plugs gap them to .018 and put the in no problem and today i get up to warm up the car and the SES light was on so i was thinking ohh well the p0140 is on again but this time i get the p0300 and this those has me kinda worried cause i just got my car a couple weeks ago and we still on the process of finishing the tune up. Let me know what you guys think what it is the mods list is in my signature.

thanks

Mitsael

 

anyone ???

 

Sounds like spark plugs to me. I think you're gapping is off. It should .022

 

Yeah, your gap is a tad too small. Like Segfault said, it should be around .022, especially with the mods your running. What fuel are you tuned on? E85, c16 or pump?

 

I am running e85 and my tuner request that gap.

 

I have the same problem on my for months. However, the code p0300 and p0304 only popup at idle when the car is started. If I clear the code after it on and drive away, the car works fine and no code at all. If I turn off the car and start it again, the code will pop up. I don't know what happen with it, and can't find the way to fix it.

 

Yeah pretty the code had show up 1 time each and is only has being at idle. But I am guessing that is kinda normal on build motor with bigger cams.

 

Dude, there's lots you could do here....find a scan tool with data stream, and look at things like fuel trims and misfire counters..OR...swap an ignition coil from like 4 to 1 and see if the missfire moves. p0304 is a cylinder 4 missfire...p0300 is a random. You could even swap injectors from each hole to see if you can pinpoint the miss. At idle there should be more vacuum in the intake tract, so a code popping at idle could be a loose intake pipe or a poor fitting CAI.

 

Gotcha and thanks bro for real !!

 

Fuel trims, and misfire was check by 2 best tuners in the area.
Ignition coil were swapped around.
Injectors were cleaned up and swapped.
Still got the same code P0300 and P0304. I'll check the intake pipe then

 

WOW that is crazy man i hope you find the problem. Mine has not come back in a week so far and the car is running fine.

 

I just got this code... Last week I had gotten a shot pre-cat o2 sensor code (cant remember the code atm) which I cleared with the MUT and this week I got the P0300. I had gotten the gsc s2 cams installed 2 weeks ago and it's normal with aftermarket cams.

The evo is not acting up weird AT ALL. Shifting is fine, no extra noises, no bucking no nothing. Thus the theory is:

Spark plugs? (I will be extremely pissed if it is because I had NGK's put in 3 weeks ago).
Relay? (running the blues but it could be the case, i will inspect later)

and the closest theory to the problem is that ECU needs to be a tweak just a little bit due to the rough idle it's thinking there is a cylinder misfire. Gonna handle this problem tomorrow as Cobb is closed today.

 

I had to disable this code on my IX after installing aftermarket cams. Unfortunately, it is very common.

 

Its not the same situation as the ct9as. A lot of X's are getting p0300 after a clutch install especially twins. The root problems vary from aftermarket clutches to engine failure. Search and you will find a lot of p0300 threads on here and the other site.

 

I get the 0300 code every now and again and clear it. I have a triple in the carand when I get the code when I am just cruising. No high revs, just normal driving.