[Kelvin1000]

So I was having some misfire problems in cylinder #3 but only during cold starts. The problem would manifest itself a lot on the Procede V3 REV2 and also on the JB3 1.4 but to a lesser extent. Once the car was hot, I never had any misfire issues at idle and the car never had a problem with misfires at WOT.

The dealer had changed my Fuel Pump a few weeks back and I replaced all my spark plugs and the coil plug in #3 to try to fix the problem myself. I took it in and they said they could not duplicate the problem (even though it had stored a few SES Cylinder #3 misfire codes).

I insisted that they keep the car and try the coldstart for a couple of days and the shop foreman actually got involved to fix the problem. And what was their final answer... They actually told me that the GOLF TEE mod was causing the inconsistent back pressure in the exhaust as the flap would not close during idle when the engine was cold. They say that this was the cause of the misfires at startup which would go away once the engine warmed up.

Can this explanation actually hold any truth to it??? I left the car without any tunes and removed the GOLF TEE mod (zip-tie mod for me) and started it up this morning without any codes but I need to do a few days of testing to see if the misfires come back.

If they don't I will put back the tunes and test some more but I can't believe the stupid GOLF TEE mod would actually have anything to do with the misfires.

Any thoughts???

[enrita]

OMG.....

[ianthegreat]

Another shining example of why you always bring the car in to the dealer completely stock. They will blame any sort of modification. I can't blame them though. They have been trained like monkeys to follow a flow chart. I know I will get flamed for this - I know the majority of BMW Techs (especially the ones on this forum) are VERY knowledgable, but there are a few circumstances where it's obvious some have no idea.

[TurboBimmer]

That's just plain stupid.

Do they call that customer service??

*insertfacepalmhere*

[Sal@AUTOcouture]

"We smelled farts inside the car. That's the reason for your misfire"

on a serious note.....THEY DON'T KNOW what's wrong, so they saw the golf-tee and blamed that.

[zhangzeyuandss]

woww.. lol. rofl..
Dealer: i am afraid you are car is no longer under the warranty .
you : what ??? why ?
Dealer: We believed that you have farted too much in your car that cause the engine misfire. and it is not repairable ..

Originally Posted by AutoCouture

"We smelled farts inside the car. That's the reason for your misfire"

on a serious note.....THEY DON'T KNOW what's wrong, so they saw the golf-tee and blamed that.

[ezatnova]

Simply ask them if all cars with the OEM BMW Performance Exhaust have backfires then...since those exhausts just have a little metal post that you plug the vaccuum flap hose into (effectively replicating the golf tee mod).
:P

[Kelvin1000]

That OK, I know sooner or later I will go back for the same problem (this time without the little zip tie that caused all the problems...)

Funny they saw the golf tee mod but not the Catless Downpipes and the Big Ass Helix Intercooler up front...

[daixloxbmw]

wow!

by that logic, i guess the 323/325/328 would have serious misfire issues!!!

unbelievable...

[Kelvin1000]

Why don't they just follow that flow chart and change the injectors...

[ianthegreat]

Originally Posted by Kelvin1000

Why don't they just follow that flow chart and change the injectors...

Because step 1 on the flow chart is check for modifications. They found 1 a modification. Therefore it is the problem untill he removes it and the problem can be replicated.

[Ramos]

I am so sick about all this BMWNA B/S... Might actually finally drive away to the dark side when my lease is up.... I mean the cars are awesome, the BMWCCA is awesome, but the dealers and BMWNA are a bunch of a$$holes and ripoffs

[BavarianBullet]

Wow.

If these guys even had a clue, they'd start with the basics like swapping around the coils and injectors (and plugs if you hadn't changed them) to see if the problem followed one of them or stuck with cyl #3.

Based on your description and some facts from others that had similar problems, the injector on #3 sounds suspect.

Combustion doesn't work well in cold cylinders, with cold fuel etc. So any small problem can be a bit worse on cold startup. So if your #3 injector is flaky, it would seem to make sense that cyl may have more problems.

It could be a lot of other things including electrical problems too. That's why they should isolate component problems first (injector, plug, coil), IMO, then move on.

Good luck on fixing it. I wonder if it's a PITA to move injectors yourself (special tools)?

[ar design]

*sigh*

[Donald-335i]

[ar design]

Sorry, but my star trek double facepalm > your bear facepalm.

[ianthegreat]

Jesus understands.

[Kelvin1000]

I swapped the coils and changed the spark plugs and I was hoping they would replace the injector because it is a pain in the ass. You not only need special tools, but you must also use their software to recalibrate the injectors to the ECU after swapping them out.

[David 12]

I guess at this point if you still get a code, you should put it back to stock then take it back to the dealer. Chances are it's probably the injector.

[Jonny550]

Because even Mr.whiskers knows more than this guy

[Quisp]

Wouldnt that be a facePAW?

I had misfires and got all 6 injectors replaced but it did not solve the problem. I have been having the failing fuel pump symptoms for a long time but they went to injectors first. Didnt change the plugs when they did them and I think that could be a small part of the problem now.

[BavarianBullet]

Originally Posted by Kelvin1000

I swapped the coils and changed the spark plugs and I was hoping they would replace the injector because it is a pain in the ass. You not only need special tools, but you must also use their software to recalibrate the injectors to the ECU after swapping them out.

Ouch. That doesn't sound like fun or shade-tree fix.