335i 'Engine Fault' warning & missfire...any experience??

[sinly]

Intermittently on start-up the warning comes on and engine runs really roughly...warning says car 'full engine power no longer available' and car indeed won't drive full power. Seems to reset if off/on however twice on journeys afer relatively hard acceleration, car has started sounding like a subaru (rough/lumpy)and again gone into safe mode.

Asked dealer to look at it 2 weeks ago when in for service (maintenance pack and extended warranty) though apparently diagnostics threw nothin up!? Rang them again after continued problems but said i'd have to pay for diagnostic (£90) though more than likely they will not find anything again!? Taken pics of the warning and video even, but where do I go if they just plug it in and say no problem!?

Thanks,

[Crackie]

Imho it would be a good idea to kick the dealer into touch ASAP. The limp mode / reduced power fault code(s) will have been logged and stored in the ECU and any vaguely competent BMW garage should have the gear to read the codes and start diagnosing the problem.

I've not had any issues with mine (so far) but there are some well documented issues with the N54 engine in the 335i. The high pressure fuel system is a weak area and 'your' symptoms sound like low fuel pressure or the injectors not working as they should. Does the starter motor crank for a while before it fires ? I've read this is often a symptom of the High Pressure Fuel Pump's seals being on the way out. This can lead to low fuel pressure and starvation at the injectors, particularly under higher engine loads. Heavy acceleration, heavily loaded car and steep hills are when the limp mode is likely to come up.

Ditch 'Lee and Lance' and hopefully you can find a better dealer to assist you. Good luck.

Edited by Crackie on Friday 18th November 09:31

[Darlo74]

As Crackie says there are known issues with the HPFP and mine had its injectors replaced under recall about 4 months ago so worth checking whether this recall is applicable to your car and if it has been done if required.

Good luck in getting it fixed.

[spacegrey335]

I'll put my money on the HPFP, Injectors, coil pack, and/ or vanos....

But most likely the HPFP...

[sinly]

Thanks guys...have looked into N54 and yes, seems there are a number of issues with HPFP, coil, injectors etc. Think you're right Crackie....different dealer, though changed back to this one after other 'local' one creased door, chipped alloy and cracked front bumoer whilst they had it...can't win it seems! I've video'd it running like a bag of spanners and throwing up fault message, so will go back with this and hopefully they will investigate further.

Darlo...had same recall on injectors (they referred to it as an 'enhancement modification' ha)a few months ago and had a water pump replaced last year after problems with overheating. Guess I need to go back to them and demand proper look at car and not get a fob off!