[germanwhip]

So i've been getting a lot of misfires on cold starts on my 57 335i, dating back 6 months and they have increased in severity and frequency since I remapped the car with a cobb accessport (1 month ago). It's gone into limp mode a few times and the error code for misfire in cylinder 6 has been consistent through out with no other errors.

I took it in for an oil service at BMW and had all the spark plugs changed and the ignition coil on cylinder 6 hoping this would correct the problem. The car seemed smoother at idle and at first cured. A few weeks later i've got the same problem and this time the check engine light has stayed on a few times, normally it would go away after warming the car up even though I have removed the remap.

Taken the car to the dealer who read the code and said spark plug, ignition coil or injector are causing the problem so lets swap them to a diff cylinder and see if the code moves! they wanted £215 to do this and for the error code reading (£60). Now the plugs and coil in cylinder 6 were done 2 weeks ago so its safe to say this isn't the problem. So I thought forget moving it and paying so much money when I can replace it for £405 incl diagnostic fees. Is this the right choice?

If it is the injector I fix the problem and it saves me £160 if its not the injector i've paid an extra £200 to find that out instead of moving it to a diff cylinder.

What do you think? Also injectors were done under recall in 2011 - how has 1 failed!

Also some p***k kicked my wing mirror when it was folded, it turned all the way out past neutral, I put it back together and now when i fold the mirror it moves in and then the motor keeps running trying to pull the mirror in! Can i reset the mirror somehow?

[Phil325i]

Do you have to go to a stealer? Why not use a good indy? Sounds like you've exhausted all possibilities other than an injector fault, so that's the next logical step...

[germanwhip]

ok so im doing the right thing by just getting a new injector. if this doesn't solve the problem what could it be?

there is a local bmw specialist but they seem to charge the same amount of money for all services! also i felt like changing garage would maybe mean starting again and ive sank £60 already in diagnostic

[gangzoom]

Search the forums on DYI on fitting injectors and coding them to your car....Not a big job.

Took me about 20 minutes to change a coil pack on my 335i to solve a misfire. Though these cars go wrong BMW has made working on the engine easy, and with so much info around on how to DYI, it's actually quite fun learning how to fix/code the car your self.

[old grey steve]

Originally Posted by germanwhip

So i've been getting a lot of misfires on cold starts on my 57 335i, dating back 6 months and they have increased in severity and frequency since I remapped the car with a cobb accessport (1 month ago). It's gone into limp mode a few times and the error code for misfire in cylinder 6 has been consistent through out with no other errors.

I took it in for an oil service at BMW and had all the spark plugs changed and the ignition coil on cylinder 6 hoping this would correct the problem. The car seemed smoother at idle and at first cured. A few weeks later i've got the same problem and this time the check engine light has stayed on a few times, normally it would go away after warming the car up even though I have removed the remap.

Taken the car to the dealer/indy who read the code and said spark plug, ignition coil or injector are causing the problem so lets swap them to a diff cylinder and see if the code moves! they wanted £215 to do this and for the error code reading (£60). Now the plugs and coil in cylinder 6 were done 2 weeks ago so its safe to say this isn't the problem. So I thought forget moving it and paying so much money when I can replace it for £405 incl diagnostic fees. Is this the right choice?

If it is the injector I fix the problem and it saves me £160 if its not the injector i've paid an extra £200 to find that out instead of moving it to a diff cylinder.

What do you think? Also injectors were done under recall in 2011 - how has 1 failed!

Also some p***k kicked my wing mirror when it was folded, it turned all the way out past neutral, I put it back together and now when i fold the mirror it moves in and then the motor keeps running trying to pull the mirror in! Can i reset the mirror somehow?

if it's cylinder specific then if you're at a dealer they would/should of carried out a smooth running check on all cylinders, if it's cylinder 6 specific then plugs, coils and swapping them around is a basic move, if one if these were the culprit the by carrying out another smooth running test you'd of looked for the issue moving cylinder.

If it hasn't and the misfire is still on cylinder 6 then you've got to look at injectors next, logic says this is the next step, we've seen a couple of 335's now with leaking injectors(using an endoscopic camera)we could actually see on ignition the injector leaking fuel into the bore and that will create the very issue you're speaking about. It can be DIY anything can be DIY but coding can be the issue there I guess(but the DIY thing isn't my bag)

Logic for us says if it's in one cylinder you do this test next, main dealer wise they usually don't go in to the issue quite the same way we do (they use the diagnostic data) they see the issue they recommend say the injector (based on what the diagnostic says) chances are they replace (and if it didn't solve the issue you'll be charged for the part accordingly) yet the diagnostic info was what they looked at and based the info on.

It is very difficult times needed. At the dealer there's obviously time constraints. We do everything I've stated above with the camera and all that as we want to "see"proof of a theory before recommending a change. But it takes time, but it's worth it.

Remember on a 335i the injectors run in 2 banks bank 1 is cylinder 1-3 bank 2 is cylinder 4-6 injecotrs on the 335i have been superceeded several times if say you've got a cylinder 6 injector fault then you have to now replace 3 injectors (bank 2) then the injectors need to be registered/coded to the car.

Again if it's injectors post fitting and of course coding I'd advise the resetting the engine adaptations if there's a software update for the engine ECU (your choice) it might be worth updating this too. If your cars an auto on the gearbox again have the adaptations re set on this too.

Reason why you'd re set adaptations is simple, cars run with this issue and adjusted to it. You need to completely erase the issue from its memory/subconscious memory and request the required re learn process where the pre set parameters via resetting adaptations and/or software update are set in stone you drive the car and it adjusts to your driving style within these guidelines and you'll feel it straight away.

If you have an injector issue trust me following this path will be a great help.

The other thing of course is to remember carbon build up. Again on the injector side if there's a leak we've seen one where neat fuel has oddly found it's way into the inlet port carbon is a major issue(walnut blasting is the way forward)

Looks like from the opening post you've made the basics have been covered.

But these can be a pain but what I've described above I've seen, been witness too and have in a round about way seen the cure in action.

Hope this kinda helps

[old grey steve]

Re spotting injectors leaking remember it isn't an easy spot(this was the 335i we had in earlier with a cylinder misfire)remember picture wise ignition on that's it and the black mass you'll see in the picture is the top of the piston. The spray from the injectors is of course obvious click on the 1st picture to see the video








high lighted below is the oddish spray pattern



and you'll notice the camera now is pointing down on to the piston crown here, which is contaminated to a degree



In the video above the injector is leaking fuel with ignition on directly in to the cylinder camera was placed so that a full visual inspection could be gathered re the misfire to conclude our theory. And we were right. But on diagnostic at that stage you wouldn't know if it were plugs, coils or injector or even compression hence the checks that are needed, if you haven't got an endoscopic camera your snookered

[germanwhip]

cheers for your input old grey steve!! very informing.

I had the injector on cylinder 6 replaced and since having it replaced I have had no issues. I think the problem has been solved because prior to taking it to the dealer it was going into limp mode on every start and so far its been smooth. the car is running 100 x better.

i reset the ecu using my cobb accessport

[germanwhip]

Anything I can do about the wing mirror? It keeps extending out past the open position and I have to manually correct it and then when folding in the motor keeps running and the mirror clicks!

[Phil325i]

Originally Posted by germanwhip

Anything I can do about the wing mirror? It keeps extending out past the open position and I have to manually correct it and then when folding in the motor keeps running and the mirror clicks!

This might help - it worked for me...

http://www.e90post.com/forums/showth...ghlight=mirror