[ehoffman]

After walnut blasting, relatively new plugs, and tested coils, I'm still misfiring on two cylinders on cold starts only. Once the car warms up it always goes away. My Indy shop claims it's injectors..mine are Index 9. Wants $2300 for it all to replace all of them with Index 11 or higher. This happens even without a tune.
Should I be skeptical? I've read that they need to recode something with the new injectors...can they do this without tuning my car back to stick with Cobb?

[Dann]

Coding injectors is different to tuning.
The coding tells the DME what the injectors are and their flowrates etc.

[cstmx_ryder]

By 'misfiring' do you mean that you can feel/hear the engine 'stutter' while at idle? And no codes thrown, right?

After you replace your injectors, you do need INPA or some other coding software to code them accordingly, based on the values on the new injectors.

I've replaced all six of my injectors about a couple months ago. The injectors cost me about $750 plus shipping. Labor (my first time) on those are about 45 min max. Coding on those injectors took all of 3 minutes (if that), once you have INPA up and running.

But, I think you might have to put COBB in map 0, or the stock map prior to coding? At least I did when I still had my Procede......

[dpaul]

By tested coils, do you mean that you swapped coils between cylinders and the affected cylinder(s) did not change? Also, by "recent plugs' do you mean that the same cylinders were misfiring before and after the plug change?

If you have adequately ruled out the possibility of bad plugs and coils, injectors is your next best bet.

I'm on my third set of injectors in 65K miles and if yours have not been changed the odds that an injector accounts for your problem are pretty good.

An experience very to what you describe prompted installation of my third set - misfiring only on start up, often accompanied by white smoke, both of which went away after a few minutes as the engine warmed up. When I pulled the plugs after letting the car sit overnight, I saw/smelled fuel on the plugs in several cylinders, indicating an injector leak.

$2300 is a breathtaking number even if you buy the injectors from a dealer, My second set of replacements were under warranty from the dealer but they used revision -09's, clearing their inventory, I suppose. They lasted a year. The third set I purchased from Rock Auto, who sell suitable injectors for ~$120 each (Standard Motor Products FJ1050 or Airtex Wells 4G2153). Whatever the origin of these, they come with BMW logos on them and are indistinguishable from OEM. They have also lasted longer than my two OEM sets of injectors combined.

Installation is pretty simple if you are at all mechanically inclined - just need a set of reverse torx sockets. There must be a DIY in E90post. Coding is required but that coding has nothing to do with the state of your tune (i.e. you do not need to go back to stock). Any decent indy shop should be able to do this for you for $150 or so. You can install the new injectors and drive the car without coding for a while without harm. A friend with INPA installed on their laptop could do it in 10 minutes - if you were in Boston, I'd be happy to do it for you and I'll wager you can find someone in KS similarly inclined.

Don't pay $2300 for this, unless you have a large trust fund and it absolutely doesn't matter

[ehoffman]

It starts up fine, even on cold starts. The second I give it has, it begins to sputter until the car warms up. It through misfire codes on cyl 5 and cyl 6

[dpaul]

Just make sure the plugs and coils are OK by swapping. If the faults stays on 5 and 6, replace those injectors (you're supposed to replace them in 'banks' i.e. 123 or 456) and get ready to replace all of them because they are probably all about to shit the bed.

[cstmx_ryder]

Also when you swap either plugs or coils, make sure you swap them into different banks.

[dpaul]

Why 'make sure' to swap to different banks? The point is to swap to a cylinder that isn't showing a fault.

[ehoffman]

Originally Posted by dpaul

By tested coils, do you mean that you swapped coils between cylinders and the affected cylinder(s) did not change? Also, by "recent plugs' do you mean that the same cylinders were misfiring before and after the plug change?

If you have adequately ruled out the possibility of bad plugs and coils, injectors is your next best bet.

I'm on my third set of injectors in 65K miles and if yours have not been changed the odds that an injector accounts for your problem are pretty good.

An experience very to what you describe prompted installation of my third set - misfiring only on start up, often accompanied by white smoke, both of which went away after a few minutes as the engine warmed up. When I pulled the plugs after letting the car sit overnight, I saw/smelled fuel on the plugs in several cylinders, indicating an injector leak.

$2300 is a breathtaking number even if you buy the injectors from a dealer, My second set of replacements were under warranty from the dealer but they used revision -09's, clearing their inventory, I suppose. They lasted a year. The third set I purchased from Rock Auto, who sell suitable injectors for ~$120 each (Standard Motor Products FJ1050 or Airtex Wells 4G2153). Whatever the origin of these, they come with BMW logos on them and are indistinguishable from OEM. They have also lasted longer than my two OEM sets of injectors combined.

Installation is pretty simple if you are at all mechanically inclined - just need a set of reverse torx sockets. There must be a DIY in E90post. Coding is required but that coding has nothing to do with the state of your tune (i.e. you do not need to go back to stock). Any decent indy shop should be able to do this for you for $150 or so. You can install the new injectors and drive the car without coding for a while without harm. A friend with INPA installed on their laptop could do it in 10 minutes - if you were in Boston, I'd be happy to do it for you and I'll wager you can find someone in KS similarly inclined.

Don't pay $2300 for this, unless you have a large trust fund and it absolutely doesn't matter

I see Rock Auto is currently out of stock for both types of injectors:
Standard Motor Products FJ1050 or Airtex Wells 4G2153
I guess I'll look for Rock Auto injectors sold through someone else..


What's the difference? Different products or just different suppliers? The part #s are different...

[dpaul]

Originally Posted by ehoffman

I see Rock Auto is currently out of stock for both types of injectors:
Standard Motor Products FJ1050 or Airtex Wells 4G2153
I guess I'll look for Rock Auto injectors sold through someone else..


What's the difference? Different products or just different suppliers? The part #s are different...

Don't know. Some have conjectured that the Rock Auto parts are reconditioned OEM BMW parts. I've purchased both Airtex/Wells and SMP injectors and both are absolutely identical to OEM BMW injectors. Perhaps they are both OEM suppliers and these injectors are ones that don't meet whatever standards are required to satisfy BMW. All I can say is that my experience has been great with these parts.

You will find a range of opinions, most if not all based on anecdotal experience, as opinion is i.e. there is no statistical validation for any of these opinions, including mine. However, you haven't got that much to lose and you've got quite a bit to gain.

I should add that the admonition by BMW to replace the injectors in 'banks' has not been clearly explained. I disobeyed and have had no issues that I am able to discern (keeping in mind my mild state of tune). Others have also disobeyed without clear negative effect. Again, you will find a range of opinions about this. I am perfectly willing to believe that BMW engineers know better than I do but without a plausible rationale I will punt.

[Jeff@TopGearSolutions]

Originally Posted by ehoffman

I see Rock Auto is currently out of stock for both types of injectors:
Standard Motor Products FJ1050 or Airtex Wells 4G2153
I guess I'll look for Rock Auto injectors sold through someone else..


What's the difference? Different products or just different suppliers? The part #s are different...

Just check Rock auto every day, they re-supply often.

Both products are OE manufacturers of the BMW injectors.

Coding injectors is fairly easy, it's not done through a tune. We offer this as a service if you are interested or there are DIY available, you'll need the cable and software eitherway whether you do it yourself or through remote coding.

Also, installing injectors is EASY, likely easiest thing to do on this car. Took me no more then a few minutes to swap each injector.

If you are remotely mechanically inclined do it yourself. You'll spend around $700 on 6 injectors and less then an hour installing.

[ehoffman]

Thanks Jeff. I'll probably contact rock auto tomorrow to see if they're index 11 or higher, and if they have the decoupling as well.
I convinced my Indy shop to install them, just with no parts and labor warranty (my shop only uses OEM parts, which is good...and expensive).

I guess the rock auto are rebuilt or reconditioned, but they seem to be reliable per everyone around here.

I'm not mechanically inclined nor any torx tools. With that said, just bought my first house and I suppose I'll need tools sooner or later

[Jeff@TopGearSolutions]

Originally Posted by ehoffman

Thanks Jeff. I'll probably contact rock auto tomorrow to see if they're index 11 or higher, and if they have the decoupling as well.
I convinced my Indy shop to install them, just with no parts and labor warranty (my shop only uses OEM parts, which is good...and expensive).

I guess the rock auto are rebuilt or reconditioned, but they seem to be reliable per everyone around here.

I'm not mechanically inclined nor any torx tools. With that said, just bought my first house and I suppose I'll need tools sooner or later

Rock auto has been shipping index 12 or later for a while now. They definately don't have any old inventory, rebuilt or refurbished. They simple sale near wholesale cost.

Rock auto are brand new OEM just without the BMW tax and mark up that BMW loves.

The rock auto have the BMW symbol and they are from BMW's supplier of injectors which I think is based out of Italy.

[dpaul]

They don't come with decoupling rings - you have to get those separately or re-use the old ones. You're not supposed to reuse them but I did. No obvious ill effects in the last 20K miles.

Mine came mostly index 12 but one with index 11. I called them and returned it, they sent me another which was index 12. Pretty easy outfit to deal with.

[Jeff@TopGearSolutions]

Originally Posted by dpaul

They don't come with decoupling rings - you have to get those separately or re-use the old ones. You're not supposed to reuse them but I did. No obvious ill effects in the last 20K miles.

Mine came mostly index 12 but one with index 11. I called them and returned it, they sent me another which was index 12. Pretty easy outfit to deal with.

Mine came with decoupling rings, oddly.

I think anyone who ordered pre 9/15 may have run into some index 11 returns.

[OregonDude]

Ordered 6 on 5 Jan and they arrived 8 days later.
The were all index -12 in original BMW packaging. Just peel the white label off and you will find the BMW part label underneath. Have no doubts, these are brand new BMW injectors...

Each one came with a decoupler and sealing ring in a mini ziplock even though a sealing ring was already installed on the injector tip compressed with the aluminum cap.

Coding the DME for the new injectors is very easy provided you have a decent eBay DCAN cable and you follow vasillalov's instructions.

My 2010 E92 was idling rough when started cold and it got worse as temperatures dropped with winter approaching. Performance did not seem right even after it warmed up. Finally the SES light came on due to cylinder misfires. Tried the cheaper fixes first; spark plugs and shuffling around the coils but misfires continued and did not move with the coil pack.

New injectors restored the performance that was missing and now the car is friken awesome to drive again!

[ehoffman]

Originally Posted by Jeff@TopGearSolutions

Mine came with decoupling rings, oddly.

I think anyone who ordered pre 9/15 may have run into some index 11 returns.

Just to be safe, I contacted Rock Auto to inquire about the Index and whether decoupling was included.

The response I received was "the manufacturer does not specify the index of these new injectors, however, the injectors are manufactured to replace the OEM style. If you have 2009 BMW 335i, this injector replaces the original MFI injector"

^^this certainly isn't a reassuring response, but based on comments around here, they are Index 12. I'll order some once they have 6 in stock (1 Standard and 2 Airtex currently)

Thanks for the help!

[Jeff@TopGearSolutions]

Originally Posted by ehoffman

Just to be safe, I contacted Rock Auto to inquire about the Index and whether decoupling was included.

The response I received was "the manufacturer does not specify the index of these new injectors, however, the injectors are manufactured to replace the OEM style. If you have 2009 BMW 335i, this injector replaces the original MFI injector"

^^this certainly isn't a reassuring response, but based on comments around here, they are Index 12. I'll order some once they have 6 in stock (1 Standard and 2 Airtex currently)

Thanks for the help!

Yea they never give straight answers to questions like that. They simple don't know and likely don't even know what you are even asking, LOL.

There stuff ships from suppliers so they don't have it in their hands to look or verify.

Bank on index 12. They will make it right if they aren't the latest so it's really no big deal.

I know dozens of guys who bought them recently all with the latest index.

Originally Posted by OregonDude

Ordered 6 on 5 Jan and they arrived 8 days later.
The were all index -12 in original BMW packaging. Just peel the white label off and you will find the BMW part label underneath. Have no doubts, these are brand new BMW injectors...

Each one came with a decoupler and sealing ring in a mini ziplock even though a sealing ring was already installed on the injector tip compressed with the aluminum cap.

Coding the DME for the new injectors is very easy provided you have a decent eBay DCAN cable and you follow vasillalov's instructions.

My 2010 E92 was idling rough when started cold and it got worse as temperatures dropped with winter approaching. Performance did not seem right even after it warmed up. Finally the SES light came on due to cylinder misfires. Tried the cheaper fixes first; spark plugs and shuffling around the coils but misfires continued and did not move with the coil pack.

New injectors restored the performance that was missing and now the car is friken awesome to drive again!

That was my experience almost to every last detail. I ended up doing 6 spark plugs and 6 coils too so everything is brand new in top top shape ready to go.

This spring I'll be doing all the fluids (Transmission, transfer case, rear end, coolant and oil) cause I'll be near 50K miles and walnut blast.

[OregonDude]

Just to let other 2010 N54 owners out there know that BMW will reimburse you for injectors purchased from RockAuto.

Was totally not expecting them to honor just a parts invoice from RockAuto but I just called the reimbursement center and they indicated a check was cut yesterday and is now in the mail.

Right on BMW!

[cstmx_ryder]

Originally Posted by OregonDude

Just to let other 2010 N54 owners out there know that BMW will reimburse you for injectors purchased from RockAuto.

Was totally not expecting them to honor just a parts invoice from RockAuto but I just called the reimbursement center and they indicated a check was cut yesterday and is now in the mail.

Right on BMW!

Why only 2010 N54? Because that's when people are starting to have injector issues?

IMO, they should cover injectors from 2007-2010 N54s.......

[theweebabySeamus]

Originally Posted by cstmx_ryder

Why only 2010 N54? Because that's when people are starting to have injector issues?

IMO, they should cover injectors from 2007-2010 N54s.......

Definitely should, and probably never will.

OP, one thing to mention is even though this is a very simple install make sure you don't pull the cap off the injectors until you're ready to install that specific injector. The sealing ring expands (hence the cap) and they need to be installed within 5mins iirc. Is it a crucial step or playing it safe? Couldn't say. But better safe than sorry.

[ehoffman]

Originally Posted by Jeff@TopGearSolutions

Yea they never give straight answers to questions like that. They simple don't know and likely don't even know what you are even asking, LOL.

There stuff ships from suppliers so they don't have it in their hands to look or verify.

Bank on index 12. They will make it right if they aren't the latest so it's really no big deal.

I know dozens of guys who bought them recently all with the latest index.




That was my experience almost to every last detail. I ended up doing 6 spark plugs and 6 coils too so everything is brand new in top top shape ready to go.

This spring I'll be doing all the fluids (Transmission, transfer case, rear end, coolant and oil) cause I'll be near 50K miles and walnut blast.

I just received my Rock Auto injectors. 5 out of 6 came with decoupling rings.
What's interesting is that though they are all Index 12, there are actually an old part number: 13537585261

Per ECS tuning and other research I've done, that part number is a 'previous revision' https://www.ecstuning.com/BMW-E92-33...uel/ES2611291/