[bkrM3]

07 335i - 60,900 miles (CPO, extended maintenance), have owned it since 30k miles

It has had (among other things) a set of plugs, 3 coils and EIGHT injectors in the 2 years I've owned it. The first time the injectors were replaced it was all 6, which was fine for a while (and this was the new part # injector...well before the recall happened). More recently, injectors were replaced on cylinders 5 and 6.

Yesterday on the highway I got a misfire, checked the code, misfire cylinder 4. SES light stays lit after several cycles.

Gas has always been 93 octane Sunoco, rarely anything else.

All misfires have been experienced with NO TUNE, including the one yesterday.

I know injectors go bad on this car...but eight of them (now possibly 9) in 30k miles? I feel like this shouldnt be happening this much. When I get the misfires it's generally highway speed, taller gears, with mid-rpm high load situations (e.g., in 4th, step on the gas at under 3k rpm, boost starts to build...hesitation...shake...SES light).

Getting really fed up with it. Is it possible the BMW software is just that bad? When I've had the COBB installed I have had 0 issues.

Any advice would be much appreciated.

[GeorgiaTech335coupe]

I'm at 12 new injectors in 48k miles....

How you describe the misfires occurring is exactly how it starts for me when one (or many) are going bad. It usually will get easier and easier and start misfiring in the shorter gears as they get worse.

[drew4392]

12 new injectors in 20k miles, here :-)

And 6 coils, 4 HPFPs, deep cleaning of valves, new valve cover/gasket, plugs, .....

My symptom was rough idleing/lurching at low RPMs.

[bkrM3]

Originally Posted by GeorgiaTech335coupe

I'm at 12 new injectors in 48k miles....

How you describe the misfires occurring is exactly how it starts for me when one (or many) are going bad. It usually will get easier and easier and start misfiring in the shorter gears as they get worse.

Ugh, thanks. At least it's somewhat comforting to know I'm not the only one who has an SES light on for a week at a time waiting on a loaner. My appointment is 11 days from now.

Still concerning though that, even though you've had 12 in 48k miles, if I end up having 9-12 in 30k, that's still 18000 miles sooner than yours gave out.

[CobraMarty]

WOW! makes me glad I have a 328xi.

[bkrM3]

Originally Posted by drew4392

12 new injectors in 20k miles, here :-)

And 6 coils, 4 HPFPs, deep cleaning of valves, new valve cover/gasket, plugs, .....

My symptom was rough idleing/lurching at low RPMs.

I've never had any valve cleaning. Do you think that could in any way be related to injectors going bad? I really don't know enough about this engine to connect the dots on that point...

My idle is often rough as well. I can feel it shaking in my butt lol. Feels like a piece of garbage.

[bkrM3]

Originally Posted by CobraMarty

WOW! makes me glad I have a 328xi.

My friend just ordered a 2011 328 msport (E90). First thing I thought was damn, that's so awesome he wont have to go to the dealer every 2 months for engine lights.

Pretty sad actually.

[MDORPHN]

Originally Posted by bkr335

I've never had any valve cleaning. Do you think that could in any way be related to injectors going bad? I really don't know enough about this engine to connect the dots on that point...

My idle is often rough as well. I can feel it shaking in my butt lol. Feels like a piece of garbage.

That's a good question. I've always wondered whether injectors might be getting "fouled" by a piece of the crap coming loose from the intake valves.

Neil

[Alan l.]

I wouldn't think so since the injectors are constantly firing into the cylinder after the valves.

I am wondering if running a bottle of Techron gas treatment would help you guys assuming its not misfires due to carbon build up in the valves. I know i felt my idle started to have a small stumble after 10K miles and after pouring in a bottle of techron (same as the bmw stuff) the stumble went away completely.

[MDORPHN]

Originally Posted by Alan l.

I wouldn't think so since the injectors are constantly firing into the cylinder after the valves.

You are right. I've got to be more careful about posting before I'm fully caffeinated!

Neil

[BobS]

I'm at 48k miles and never had a injector with a issue. I would complain to bmw and take the case up to BMW NA.

[bkrM3]

I wonder if it is possible for a misfire to be caused by carbon buildup in the valves and, if so, whether there's any way to tell if that's the problem instead of an injector. If all the code says is "misfire cylinder 4," that isn't super helpful in getting to the root of the real problem, especially if new injectors make the problem go away for a little while regardless of a bigger underlying problem.

Anyway, even if it's not carbon buildup I think there must be something else going on...injectors shouldnt be going bad with this frequency on decent gas.

[vase330]

My car has 28K miles too and been through a set of injectors too. Nothing unusual about that in these cars. Its a Sep 07 Build 335i. In addition to that have had 3 HPFPs, 2 new solenoids, a set of Turbos. It wasn't boosting and I was in rattle hell for a while. They went through all the usual replacements found wastegates weren't seating right. New ones went in it still wouldn't hold boost. Discovered the solenoids were bad. BMW decided to replace everything and all is good again. My CCC, IDrive, Most bus, amplifier and Some module all replaced too. Seriously the car is now better than it was when new. It runs much smoother and no crapolla rattling like a bunch of coins in a can.

I am just out of warranty now, and wondering if I should dump it when I get to around 50K miles. Honestly I feel owning one is a blast, but a bad investment all the same, because I can't see the issues ever ending. I had an E46 M3 I sold with barely 9K on it and went to a E46 330ci because that M3 was just endless problems and I got fed up. I had motoring bliss for a while in the 330ci. Only issue was two bad steptronics. First one at 90 miles, and the replacement one at 112K and I had to pay out of pocket for a new one. I swore it was the last BMW for me, but then came the 335i and one drive in it, it was just too much to resist. Crossed my fingures hoped for the best, but it too turned out to be a stealership frequent flier. Love it though, and I got a RAV4 for a reliable vehicle. It has 33K, and never a hiccup, not one. Only oil change and thats it. Now the BMW.... So much for the ultimate driving machine, or is it Joy BMW

[David1]

Carbon build up on the valves can give you misfires due to blocked are flow and mimic a bad plug or injector. Just talk to the Audi guys about misfires and carbon.

[hoopvillian]

Originally Posted by BobS

I'm at 48k miles and never had a injector with a issue. I would complain to bmw and take the case up to BMW NA.

78k here, still on original injectors and coils. zero issues except for misfire under one beta version of a Procede map that got cleared up in the next version.

Driving style = 90% calm 10% aggressive

[bkrM3]

Update: dealer replaced 3 more injectors - cyls 4, 5 and 6 today. Makes a total of 11 injectors replaced since July 2 of 2009.

Maybe the new ones are better? lol.

[Elie335]

14 injectors 30k miles.

[bkrM3]

Originally Posted by Elie335

14 injectors 30k miles.

I think you're currently winning. Or losing, depending on how we look at it

[Elie335]

Originally Posted by bkr335

I think you're currently winning. Or losing, depending on how we look at it

believe me man, those injectors are big PITA, I JUST DON'T KNOW why BMW didn't find a solution yet.

[bkrM3]

Originally Posted by Elie335

believe me man, those injectors are big PITA, I JUST DON'T KNOW why BMW didn't find a solution yet.

shop foreman told me today theyre having to replace less and less in the N54 as cars start getting the newest injectors...he said they havent replaced a single one in an N55 yet, so maybe theyre getting better.

guess only time will tell on that one. he said 'i suspect youll be fine after this replacement' but im very skeptical of that...

[tibra1]

Originally Posted by Alan l.

I am wondering if running a bottle of Techron gas treatment would help you guys assuming its not misfires due to carbon build up in the valves.

tehcron will keep the injectors clean..n BMW recommends using it. I have used a bottle of techron or BG44k every 5Kmiles and knock wood 20K and no problems except one HPFP..of which i was on the very first part #

[Elie335]

Originally Posted by bkr335

shop foreman told me today theyre having to replace less and less in the N54 as cars start getting the newest injectors...he said they havent replaced a single one in an N55 yet, so maybe theyre getting better.

guess only time will tell on that one. he said 'i suspect youll be fine after this replacement' but im very skeptical of that...

lets see, the last 6 injectors in my car are from the newest version injectors.