1. K

    Misfire on Cyl 4

    2009 BMW 335XI So recently I've been trying to diagnose my misfire on my N54, I have swapped coils, spark plugs, injectors, changed injector seals, decouplers. My car is still misfiring at idle and under 100% load for some reason and I don't know what to change or what to swap anymore. If...
  2. S

    N54 (E92) Spark Plugs/Coils bad every 6-7k miles

    Hello all, first forum post so I hope I do this right. Got my car in April this year(2010 BMW 335i e92), and it currently has 70k miles. Mods: VRSF Dual Cone Intake Upgraded Chargepipe VRSF 7.5" Intercooler BMS Oil Cooler Valve Maintenance: Valve Cover Gasket 65k miles Oil change when I got...
  3. fs125

    Desperate Need In Help For High AFR Idle Misfire

    Car is a 2009 BMW 335xi with about 80k miles. A little back story, at the tail end of 2019 my car went down with a bad HPFP. As the car was already down and I'd have take it apart, I decided I'd install my mods and maintenance parts I'd been gathering. The misfire started pretty much after...
  4. Jeffman

    Help / Advice Sought: PR Coils ignition Codes and Misfires

    Well my cylinder 2 electrical problems have returned. :coldsweat: It started a few months ago. Started to get 2E19 DME Firing Cyl 2, especially after the engine had completely warmed up and idling or driving slowly in a parking lot or garage. At the time spark plug 2 was only hand right. Code...
  5. D

    Help With Misfire N54 FBO

    I have recently installed precision raceworks coils onto my N54 and have been getting misfires Im FBO excluding a cat back exhaust i also have 94 octane in the tank
  6. Seaneezy

    no cowl/engine cover + rainwater = ruined 6th cylinder spark plug

    It's raining in norcal recently, usually don't have to deal with these sorts of issues. I was having misfires in cyl 6, somewhat surprised since I replaced the spark plugs less than 2000 miles prior. I assumed it was a leaky injector that wasn't throwing codes but I pulled the plugs anyways to...
  7. MOSFETS Forever

    Misfire problem, Bank one Fuel trim

    Fellow N54 friends, I would like input and ideas. I'm new to the form and this problem is driving me insane. My car is currently experiencing a mixture control problem on bank 1 ONLY. Under boost stft will go to -32%, even under light acceleration. It is also Throwing corresponding misfire codes...
  8. Ztuck45

    Precision Raceworks coil failure?

    I’m looking for some insight. I recently developed a cylinder 6 and 5 misfire. Cylinder 6 was intermittent under load and cylinder 5 started misfiring intermittently as well but eventually became a constant misfire (Even at idle). I just started running full e85 after installing a double shotgun...
  9. Ztuck45

    Misfire issues (with precision coils)

    So I need some help. I've been having random misfires that I believe is originating from my spark plugs. I'm running the precision ignition system on e50 and usually 17-20psi. I had been using NGK 95770 gapped to .022 which worked fine for a while but I started getting random misfires under...
  10. Ztuck45

    Precision Raceworks Ignition Upgrade DIY

    Hey guys I just installed the Precision Ignition upgrade on my car. I'm super happy with how the car feels now. I was getting crazy misfires before and somewhat of a rough idle but it runs mint now! I'm also working with EMP tuning so I can get the most power out of it. I made a DIY with some...