[The Kingpin]

So i have a 2007 335i. I have an ETS intercooler, downpipes, xpipe, DCI, JB4 (not currently installed). I had been having rough idles and misfires under load. Took it into Dealer 2 weeks ago. They had it until this past friday. They checked everything - vanos, fuel pressure, compression, replaced 3 injectors, etc.

They told me they narrowed it down to O2 sensors. They changed both sensors and said it was running great.

We went for a sunday drive yesterday. Merging onto a highway and i pinned it. Engine light flashing, violent shaking, no power. Pulled over and shut off car and waited a few minutes. Turned back on, seemed normal. Pull back on to highway and pinned it again - same thing.

I have had this issue for almost a year. So far they have changed valve gasket, oil gasket, turbos, all 6 injectors (replaced 3 last week again), walnut blasting, sparkplugs are 3 months old, just had an oil change.

This last week when i took it in i said i thought it was a fuel pump issue. They said they checked and was all good. I have pulled codes before with JB4 and i get misfires on 5 of 6 cylinders and a fuel delivery sytem code.

Anyone have any clue as to what i might be missing?

Also, the misfires get worse the warmer the car gets. On a cold engine they are little blips. After driving for a bit more than a half hour yesterday was when shit went down.

[AtlantaDude]

Originally Posted by The Kingpin

So i have a 2007 335i. I have an ETS intercooler, downpipes, xpipe, DCI, JB4 (not currently installed). I had been having rough idles and misfires under load. Took it into Dealer 2 weeks ago. They had it until this past friday. They checked everything - vanos, fuel pressure, compression, replaced 3 injectors, etc.

They told me they narrowed it down to O2 sensors. They changed both sensors and said it was running great.

We went for a sunday drive yesterday. Merging onto a highway and i pinned it. Engine light flashing, violent shaking, no power. Pulled over and shut off car and waited a few minutes. Turned back on, seemed normal. Pull back on to highway and pinned it again - same thing.

I have had this issue for almost a year. So far they have changed valve gasket, oil gasket, turbos, all 6 injectors (replaced 3 last week again), walnut blasting, sparkplugs are 3 months old, just had an oil change.

This last week when i took it in i said i thought it was a fuel pump issue. They said they checked and was all good. I have pulled codes before with JB4 and i get misfires on 5 of 6 cylinders and a fuel delivery sytem code.

Anyone have any clue as to what i might be missing?

Also, the misfires get worse the warmer the car gets. On a cold engine they are little blips. After driving for a bit more than a half hour yesterday was when shit went down.

Shit dude, this blows... You're going to need better codes than what the JB4 tells you. If you have a BT scanner, keep it in the car... You need to get the codes that pop WHEN then error occurs... Not after you've cycled the car. The fuel pumps can be ok under idle load, but failing under WOT. It sucks that you've been spark chasing this long. I've at the point of replacing my fuel injectors on my car, I still have the original OEM injectors, and other than the fuel pumps, they're the only thing that I haven't replaced... Good luck on your hunt though.

[SeminoleN54]

Sounds like coil packs.

[AWil335i]

Originally Posted by SeminoleN54

Sounds like coil packs.

^Exactly since you didn't mention changing them in the post. I'd think that would be one of the first things you or the dealer would change?

Also, I'd put the JB4 in and see if you can get a log of what is happening when you're getting the misfires. It may help pinpoint whether it's fuel or ignition related...

[pwr hungry]

I'd do coils and if that doesn't fix it swap the hpfp.

[The Kingpin]

The dealer checked the coils. all were good but one. I replaced that one a few months ago.

The only thing left that i can think of is the hpfp or the lpfp.

They even did a compression test last week and it holds all the right levels.

[rudebwoi]

Originally Posted by The Kingpin

So i have a 2007 335i. I have an ETS intercooler, downpipes, xpipe, DCI, JB4 (not currently installed). I had been having rough idles and misfires under load. Took it into Dealer 2 weeks ago. They had it until this past friday. They checked everything - vanos, fuel pressure, compression, replaced 3 injectors, etc.

They told me they narrowed it down to O2 sensors. They changed both sensors and said it was running great.

We went for a sunday drive yesterday. Merging onto a highway and i pinned it. Engine light flashing, violent shaking, no power. Pulled over and shut off car and waited a few minutes. Turned back on, seemed normal. Pull back on to highway and pinned it again - same thing.

I have had this issue for almost a year. So far they have changed valve gasket, oil gasket, turbos, all 6 injectors (replaced 3 last week again), walnut blasting, sparkplugs are 3 months old, just had an oil change.

This last week when i took it in i said i thought it was a fuel pump issue. They said they checked and was all good. I have pulled codes before with JB4 and i get misfires on 5 of 6 cylinders and a fuel delivery sytem code.

Anyone have any clue as to what i might be missing?

Also, the misfires get worse the warmer the car gets. On a cold engine they are little blips. After driving for a bit more than a half hour yesterday was when shit went down.

don't mean to thread jack but also having the same issue....

-Injectors are new replaced by BMW
-Coils have been switched all around each cylinder and even replaced, tested by bmw
-Boost test comes back OK
-Walnut blasting done
-Compression is 170 across the board with 160 on Cyl 6
- Vanos solenoids, and even bearing ledges replaced

Codes are vague, but also similar to you and also has issues at cold start. Sometimes the issue completely disappears, but under load can almost never get past 3500 RPM.

Dealer also says HPFP and LPFP are fine, I've logged and even watched it on the Cobb. I'm at a loss...

[Tzu]

Originally Posted by The Kingpin

They checked everything - vanos, fuel pressure, compression, replaced 3 injectors, etc.

I dont see vacuum listed here.

[jayzF30]

Have you done a compression or leakdown test? Personally I do not trust the dealer at all.

[Eat.Sleep.Race]

I would have got so frustrated probably would of sold the car lol... Good luck and hopefully once you get it figured out you can give the forum some insight on wha tthe next issue is.

[Bluesnake01]

A vacum line leaking can make this happen as well. So if you changed your coils from cyl 1 to cyl 6, does it still show cyl 1 bad or does it jump to cyl 6?

[The Kingpin]

I called the dealer yesterday. they are taking it back in next monday. They said they were focused on rough idle and bouncing rpms.

I asked several times if they had taken it on a hard run on the highway and they said they did take it for a drive but it doesnt sound like they took it for a hard run which is when it misfires.

I still think it is a fuel delivery issue. Can onyone think of any other thing that it could be if all these other things have been addressed?

[Dustz]

coils

[ksalih]

Originally Posted by Bluesnake01

A vacum line leaking can make this happen as well. So if you changed your coils from cyl 1 to cyl 6, does it still show cyl 1 bad or does it jump to cyl 6?

What he said, I would still bet it's coils. Switch them and see if the missfire follows the coil. Have you walnut blasted? Try one step colder plugs, they fixed my missfire issues at WOT with my mods.

[The Kingpin]

So took the car back yesterday to figure it out. They scanned all the codes and found many instances of multiple misfires. They checked the coils and vanos. All were good. changed out my sparkplugs for free.

Now ill run it hard for about a week to see if we finally got it. Last night and today, so far so good. Cant wait to get the JB4 back on there.

[LQQKOUT]

Mine did the same thing under load and it was the VANOS solenoids.

[dbudh001]

I have an 07 June built. I had this issue it's the HPFP failing. Haven't gone bad yet. dont forget you are tuned - Would have been great if you had a Cobb. You could monitor fuel - it Could also be the ecu. You May have blown a MOSFET or 2 on the ecu. There's an awesome write up and tons of documentation of this happening search the forum " blown ecu misfire" . What ecu is it ? Ecu for. 2007s are prone for this. & It could also be the coil packs - I mean Uve done everything else

Btw if that dealer didn't start with changing coils as their starting point they suck

Here's one of the threads
Repairing a 'fried' N54 MSD80 DME http://www.e90post.com/forums/showthread.php?t=734162" rel="ugc" target="_blank">http://<a href="http://www.e90post.c...p?t=734162</a>" rel="ugc" target="_blank">http://<a href="http://<a href="http...734162</a></a>

[dbudh001]

Another suggestion take it to another dealer bc those guys don't sound like they know what they are doing

I went and looked for the paper work. They did and replaced the following



Walnut blasting
Ecu
Injectors bank2
Coils
HPFP