Misfire issues
Aug 2, 2017, 06:34 PM
#1
Newbie
Thread Starter
Misfire issues
I originally have a P0304 misfire on cylinder 4 code. I changed my spark plugs with OEM spark plugs and still got the P0304 code. Next I swapped coil plugs with cylinder 3 and still got the P0304 code.
Well today I swapped the fuel injector from cylinder 4 with the fuel injector from cylinder 2 and now I'm getting P0300 multiple misfire code.
Im about to give up with this car. I've had it for two weeks and it's bad luck.
Well today I swapped the fuel injector from cylinder 4 with the fuel injector from cylinder 2 and now I'm getting P0300 multiple misfire code.
Im about to give up with this car. I've had it for two weeks and it's bad luck.
Aug 2, 2017, 06:43 PM
#2
Evolved Member
Most of the time a hard misfire. I.e p0304 will always set a p0300.
You need to go back to cylinder 4 and continue diagnosing.
You should do a compression test before loading up the parts cannon.
Last thing you want is to throw coils,injectors, plugs and the real issue is low compression in the cylinder caused by. I.e bent,burnt,chipped valve or bad rings. Etc etc
You need to go back to cylinder 4 and continue diagnosing.
You should do a compression test before loading up the parts cannon.
Last thing you want is to throw coils,injectors, plugs and the real issue is low compression in the cylinder caused by. I.e bent,burnt,chipped valve or bad rings. Etc etc
Aug 3, 2017, 09:34 AM
#3
Newbie
Thread Starter
Most of the time a hard misfire. I.e p0304 will always set a p0300.
You need to go back to cylinder 4 and continue diagnosing.
You should do a compression test before loading up the parts cannon.
Last thing you want is to throw coils,injectors, plugs and the real issue is low compression in the cylinder caused by. I.e bent,burnt,chipped valve or bad rings. Etc etc
You need to go back to cylinder 4 and continue diagnosing.
You should do a compression test before loading up the parts cannon.
Last thing you want is to throw coils,injectors, plugs and the real issue is low compression in the cylinder caused by. I.e bent,burnt,chipped valve or bad rings. Etc etc
Well if thats the case then this went from bad to horrible. Im sure thats big money to fix those issues.
Aug 4, 2017, 01:13 PM
#4
Evolving Member
I had this problem on a consistent basis for a while too. Changed plugs, swapped coil packs, and then finally pulled my injectors (ID1000s) and had them cleaned and matched.
Thought I nailed it because numbers 2 and 4 failed the spray pattern test prior to cleaning. Wrong.
While it didn't happen as much as before, it would still come on every few days and I finally noticed that the PCV dumps into a runner that starts in #4 and then internally traverses all four cylinders...
I finally installed a catch can from Radium and the misfire has not come back since. (That was six months ago.) Who knows - maybe try capping off your PCV vent on the intake and just running it external for a little bit to see if that helps?
-asher
Thought I nailed it because numbers 2 and 4 failed the spray pattern test prior to cleaning. Wrong.
While it didn't happen as much as before, it would still come on every few days and I finally noticed that the PCV dumps into a runner that starts in #4 and then internally traverses all four cylinders...
I finally installed a catch can from Radium and the misfire has not come back since. (That was six months ago.) Who knows - maybe try capping off your PCV vent on the intake and just running it external for a little bit to see if that helps?
-asher
Aug 4, 2017, 02:14 PM
#5
Newbie
Thread Starter
I had this problem on a consistent basis for a while too. Changed plugs, swapped coil packs, and then finally pulled my injectors (ID1000s) and had them cleaned and matched.
Thought I nailed it because numbers 2 and 4 failed the spray pattern test prior to cleaning. Wrong.
While it didn't happen as much as before, it would still come on every few days and I finally noticed that the PCV dumps into a runner that starts in #4 and then internally traverses all four cylinders...
I finally installed a catch can from Radium and the misfire has not come back since. (That was six months ago.) Who knows - maybe try capping off your PCV vent on the intake and just running it external for a little bit to see if that helps?
-asher
Thought I nailed it because numbers 2 and 4 failed the spray pattern test prior to cleaning. Wrong.
While it didn't happen as much as before, it would still come on every few days and I finally noticed that the PCV dumps into a runner that starts in #4 and then internally traverses all four cylinders...
I finally installed a catch can from Radium and the misfire has not come back since. (That was six months ago.) Who knows - maybe try capping off your PCV vent on the intake and just running it external for a little bit to see if that helps?
-asher
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