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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > (PLEASE HELP) 2007 335i Intermittent misfire



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      11-10-2023, 08:42 AM   #1
samson1128
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(PLEASE HELP) 2007 335i Intermittent misfire

Hello all, I’m truly stumped by this one. I have a FBO 2007 335i and I have a very strange intermittent misfire, so sometimes when I go to drive my car it runs perfectly fine, it will boost as it should and run pretty well apart from some small little cold start misfires but nothing crazy. But other times, whenever I go to drive the car it’s practically undriveable, once I get into ANY sort of positive boost the car will hesitate and misfire really badly on different cylinders every time being practically undeiveable past 60mph, any positive boost at all will cause the misfire to happen. I’ve done plugs (gapped correctly), coils, mosfet replacement, injectors (not index 12 but from what I believe to be good ones) brand new turbos, boost solenoid, valve cover gasket, all within the past 500miles. Truly stumped, I will say though I did take a log and on 30 percent ish throttle when the car will start misfiring bad when getting into boost my rail pressure was wayyyy down at about 750-1000psi when doing the log. On my other logs where the car works perfectly fine it’s at 1600-2200 each time, and my lpfp is reading 70psi+ aswell. Could this be a hpfp? Just confused me because it’s intermittent and has been happening for months now, or could this be a sensor? I looked at my afr aswell and bank 1 was at 30 and bank two was at 40 which is wayyyyy off so I’m just not quite sure what this is, any help is GREATLY appreciated
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      11-10-2023, 10:53 AM   #2
SlowE92
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Quote:
Originally Posted by samson1128 View Post
Hello all, I’m truly stumped by this one. I have a FBO 2007 335i and I have a very strange intermittent misfire, so sometimes when I go to drive my car it runs perfectly fine, it will boost as it should and run pretty well apart from some small little cold start misfires but nothing crazy. But other times, whenever I go to drive the car it’s practically undriveable, once I get into ANY sort of positive boost the car will hesitate and misfire really badly on different cylinders every time being practically undeiveable past 60mph, any positive boost at all will cause the misfire to happen. I’ve done plugs (gapped correctly), coils, mosfet replacement, injectors (not index 12 but from what I believe to be good ones) brand new turbos, boost solenoid, valve cover gasket, all within the past 500miles. Truly stumped, I will say though I did take a log and on 30 percent ish throttle when the car will start misfiring bad when getting into boost my rail pressure was wayyyy down at about 750-1000psi when doing the log. On my other logs where the car works perfectly fine it’s at 1600-2200 each time, and my lpfp is reading 70psi+ aswell. Could this be a hpfp? Just confused me because it’s intermittent and has been happening for months now, or could this be a sensor? I looked at my afr aswell and bank 1 was at 30 and bank two was at 40 which is wayyyyy off so I’m just not quite sure what this is, any help is GREATLY appreciated
Low Rail pressure would indeed indicate that your HPFP is going out. Also 30 and 40 AFR is very lean. Can you post the log with the codes?
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      11-10-2023, 12:10 PM   #3
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Fix your rail pressure. 30% throttle and 750 psi is your issue. Likely a new HPFP is needed. But I would log your low fuel pressure just to be sure.

Last edited by Torgus; 11-10-2023 at 01:57 PM..
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      11-20-2023, 09:36 AM   #4
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FINALLY, finished my hpfp replacement and no luck, it still struggles to get rail pressure but once again sometimes on a cold start it will work perfectly fine. I’m at a loss for this car, still the same issue except the car attempts to build boost instead of just straight boost cut but there’s just not enough fuel to keep up for when it tried to go into boost. Still will sometimes drop to 750 psi on 50 percent throttle causing the worst hesitation I’ve ever felt, anymore ideas for what could be doing this? Lpfp still reading good at 70-88 psi
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      11-20-2023, 09:39 AM   #5
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Another weird thing, I keep getting a code related to my throttle body. 2D2E comes on with almost every single misfire I’ve had so far, but not sure if this could be related to the fueling issue unless a sensor has gone bad? Any thoughts?
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      11-21-2023, 09:15 AM   #6
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It should be right at 70-72psi at idle. I don't think it should ever get up to 88psi...

HPFPs have been known to be bad out of the box fwiw. Another guy on here just had that problem. Not saying that is your problem, but the LP fuel sensor is right before the HPFP so the pump should be seeing that 72 psi of pressure which is the sweet spot.

Post up a log?
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      11-21-2023, 12:32 PM   #7
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Maybe a faulty high pressure sensor?

I had a problem with my low pressure sensor giving readings that looked normal, just low - showing 50s at idle with occasional random dips below 20. No misfires but I had erratic throttle response off idle with occasional bucking/hesitation. It looked like a working sensor showing fuel system problems. After replacing LPFP and regulator with no improvement, I replaced the low pressure sensor and that fixed all the problems.
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