so my car has had a cyinder missfire p0304 and a PFFFE code?
and i arleady chcked the following:
coilpack
spark plugs
-tomorrow i will be hopefully swapping injectors and see if the problem moves with the said injector.
is there anythig else i could check?
if after the injector swap nothing changes i will be getting a compression check done to make sure everything is all good. the car operates like normal, i havent done any hard driving since the CEL first came on, also as far as mods im running a 16g,header/up/tbe,inlet,spt shortram,top mount. car has 70k. all mods have about 30k miles.

 

try injectors thats all i can say for sure.

 

Agreed, I asked my dad what he thought about this and he said injectors for sure. He is not a professional mechanic anymore nor is he a modern one but he knows his way around a motor lol

 

Similar issue with mine as well. It could be coil packs, plugs gapped incorrectly, injectors failing/clogged, or a tune issue. I thought my issue was fixed with minor tuning fix but it's still happening. I get misfires on 1 and 3 but generally showing the same codes. Just had my engine checked and its in great health just this minor issue going on. Does the car feel normal after you are above a certain RPM? Misfires only at idle or did it misfire under load?

 

After you check your compression, check your valve clearance as well.

 

had the same problem with misfire in 1 and 3 turend out it was my avcs solenoid begin jammed/ clogged up. Swapped it out for another used one and problem was solved.

 

Had the same. Coil pack was misfiring.

 

I'm going to swap injectors out and see if that's the problem....now to find time to do it lol

 

Did this happen once or is it a recurring issue?

I've had a few misfires over the years and only worry about it when it's recurring. LOL.

Bad plugs caused mine.

 

Yeah it's recurring.... About every 24hrs after ecu reset cel comes back

 

Damn. Sounds to me like a failing coil pack but who the heck knows.

Good luck man. Can you get live data logs on your set up?

 

Keep us posted man because I got the same code and changed the plugs and it's been like 3 months with no CEL .

 

That's what fixed mine. But it was as consistent as his.

Hopefully it's something that simple. Chasing codes can suck big time.

I've got one on all the time right now. Stupid tumbler sensor broke.

 

I did a coilpack swap and issue still returned, did plugs and issue returned...onlything let is injectors... And Pray cause anything after that is going to be $$$$

 

Word. Good luck man.

Hopefully you find it and it's not an ECU issue or something mechanical.