P304 CEL 4th Cylinder Misfire
#6
EvoM Guru
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It can be a plug or an injector. The coil shares itself with number 2 cylinder so it would cause a misfire code for that one also. Try the plug first, even if it looks ok you should replace it. If the code comes back,try and swap injectors with the number 3 cylinder and erase the codes once again. If the code comes back and it is for #3 cylinder then you know the injector is the problem. Good luck.
Gil-superz
Gil-superz
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#8
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Originally Posted by titaniumkingpin
update-
today i threw two P300 codes.
what could that mean? yesterday i throw a 4th cylinder misfire and now today i get two P300 codes.
im changing my plugs out today.
thanks superz, im going to try swapping injectors also. any other ideas?
today i threw two P300 codes.
what could that mean? yesterday i throw a 4th cylinder misfire and now today i get two P300 codes.
im changing my plugs out today.
thanks superz, im going to try swapping injectors also. any other ideas?
Also - spark plugs are comething I would check
If the plugs are bad - again check your a/f ratio as when its off it can foul your plugs
Best of luck sorting it out
#10
EvoM Guru
iTrader: (5)
Originally Posted by titaniumkingpin
possible bad coil pack???
Anyway, change your plugs to start off with.. Its cheap insurance.
Didn't I recommend this already in a different post?
#14
Evolving Member
iTrader: (10)
Ok this may be an old thread but I got the 4th cyl misfire after driving home on the 11th coming home from my tune at Buschur, went right to autozone after I got off the freeway, plugs looked good, got a new set of BPR8ES at .26 same as when I was tuned just hours prior, reset the ecu and car idles very rough...... any ideas?!?!? Sorry for the late post I went out of town right after I got back! any ideas?!?!?
#15
i remember when i was going through these codes daily!!
I can't pinpoint what the problem was but now its gone.
I changed plugs and was still getting both these codes. Then after i got reflashed again by a different tuner, my car is running solid without any codes.
I'm not saying it was the tune or the plugs.... im just not sure.
Good Luck
I can't pinpoint what the problem was but now its gone.
I changed plugs and was still getting both these codes. Then after i got reflashed again by a different tuner, my car is running solid without any codes.
I'm not saying it was the tune or the plugs.... im just not sure.
Good Luck