[jpsimon]

Im trying to find the injector part number for my car (2008 335xi).

http://www.realoem.com/bmw/showparts...82&hg=13&fg=15

real oem says the part number is:
13537585261

but on tischers site it doesn't specifically list my car:
http://www.trademotion.com/partlocat...&siteid=214672


it lists 135...535... etc... can someone confirm this is the correct part for my car?

when people talk about misfire at idle and mention replacing the injector(s) this is what they're talking about correct?

also, does a dealer have to install this since it needs to be "coded"?


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ok so here's the scoop... let me know if you guys think it's a bad injector:

I'm having misfiring/very rough idle during cold starts. Getting misfire code for cyl 1,2,3. Went in and the spark plug for cylinder 1 was GROSS but cyl 2 and 3 were just as clean and perfect as cyl 4,5,6 which were not misfiring. Thought it was the coil, so i swapped that cyl 1 coil to cyl 4 to see if the problem followed but it didn't... restarted the car and cyl 1 was misfiring. I swapped in all new plugs last night, but that didn't fix the problem... this morning cold start misfiring

It's gotta be the injector for cyl 1 right?

[dzenno]

dealer does have to code them...every injector has a number on it that they have to enter and save into the dme so that injection works properly...changing the coils too?

[jpsimon]

ok so here's the scoop... let me know if you guys think it's a bad injector:

I'm having misfiring/very rough idle during cold starts. Getting misfire code for cyl 1,2,3. Went in and the spark plug for cylinder 1 was GROSS but cyl 2 and 3 were just as clean and perfect as cyl 4,5,6 which were not misfiring. Thought it was the coil, so i swapped that cyl 1 coil to cyl 4 to see if the problem followed but it didn't... restarted the car and cyl 1 was misfiring. I swapped in all new plugs last night, but that didn't fix the problem... this morning cold start misfiring

It's gotta be the injector for cyl 1 right?

[bryce]

logically speaking, your next trouble shooting step would be to replace the injector. you've already done plugs and coil swaps

[scalbert]

Yep, sounds like and injector but you should really replace all three in that bank. And yes, the dealer will need to code them. BT will have this ability in the future but currently not available for the petrol engines.

[jpsimon]

Originally Posted by scalbert

Yep, sounds like and injector but you should really replace all three in that bank. And yes, the dealer will need to code them. BT will have this ability in the future but currently not available for the petrol engines.

Why is it a good idea to replace all 3 in the bank? I will if you guys think that's best, but just curious why

[dzenno]

Its definitely your cyl 1 injector...what happens is as the car sits turned off for longer periods of time (as in over night for example) some fuel "leaks" through the bad injector into the cylinder...when you start your car after that in your case cyl 1 will be too rich to start out and it'll misfire if you turned your car off RIGHT away after that you'd see only a cyl 1 misfire if you scanned for codes...most of the time ppl leave it running for a bit after it starts misfiring and in this case what happens is the other two cylinders in the same bank, bank 1 in your case, will also misfire as the DME will lean them out...then you'll get misfires cyl 1,2 and 3 masking the issue ask me how I know...remember my head gasket problem way back when?

Anyway, its your cyl 1 injector for sure but changing that cylinder's plug and coil as well is a BMW "recommended" service procedure...if it were me I'd do the cyl 1 injector and the plug at the minimum...

[jpsimon]

I literally installed all new plugs last night, do I need to really replace that cyl 1 plug again?

also you hit the nail on the head... when I swapped the coil and started the car that one time... i turned it off pretty quick and only had the cyl 1 misfire... when i left it running for longer the other cylinders started misfiring

Originally Posted by dzenno

Its definitely your cyl 1 injector...what happens is as the car sits turned off for longer periods of time (as in over night for example) some fuel "leaks" through the bad injector into the cylinder...when you start your car after that in your case cyl 1 will be too rich to start out and it'll misfire if you turned your car off RIGHT away after that you'd see only a cyl 1 misfire if you scanned for codes...most of the time ppl leave it running for a bit after it starts misfiring and in this case what happens is the other two cylinders in the same bank, bank 1 in your case, will also misfire as the DME will lean them out...then you'll get misfires cyl 1,2 and 3 masking the issue ask me how I know...remember my head gasket problem way back when?

Anyway, its your cyl 1 injector for sure but changing that cylinder's plug and coil as well is a BMW "recommended" service procedure...if it were me I'd do the cyl 1 injector and the plug at the minimum...

[scalbert]

Originally Posted by jpsimon

Why is it a good idea to replace all 3 in the bank? I will if you guys think that's best, but just curious why

They redesigned them and for whatever reason the you are supposed to replace all three in a bank at a time. The dealer may require this. Once we can code our own injectors, it would be interesting to see if we can get away with a single swap.

[dzenno]

I'm getting good at this what can I say

Plug gets fouled due to that extra fuel...I'd replace it just to be on the safe side especially with your turbos

[jpsimon]

Originally Posted by dzenno

I'm getting good at this what can I say

Plug gets fouled due to that extra fuel...I'd replace it just to be on the safe side especially with your turbos

aw man, i just bought those one-step colder plugs.. looks like i'll have to get one more to bring to the dealer heh

[DefactoM6]

You literally just installed them yesterday. You are probably fine with the 6 fresh plugs. But yeah that has bad injector written all over it...

[cn555ic]

It really sucks that you have to bring it into the dealer to code the injectors. I hope soon there will be a way to code them ourselves

[jpsimon]

how much do dealers generally charge for injector(s) install? not for the parts, just for the time spent

[scalbert]

I would guess at a few hours.

[David1]

Originally Posted by dzenno

Its definitely your cyl 1 injector...what happens is as the car sits turned off for longer periods of time (as in over night for example) some fuel "leaks" through the bad injector into the cylinder...when you start your car after that in your case cyl 1 will be too rich to start out and it'll misfire if you turned your car off RIGHT away after that you'd see only a cyl 1 misfire if you scanned for codes...most of the time ppl leave it running for a bit after it starts misfiring and in this case what happens is the other two cylinders in the same bank, bank 1 in your case, will also misfire as the DME will lean them out...then you'll get misfires cyl 1,2 and 3 masking the issue ask me how I know...remember my head gasket problem way back when?

Anyway, its your cyl 1 injector for sure but changing that cylinder's plug and coil as well is a BMW "recommended" service procedure...if it were me I'd do the cyl 1 injector and the plug at the minimum...

Yes and know to that. When a DI injector fails, most of the time the spray pattern has a divergence which will spray fuel directly at the plug preventing the spark and quickly eroding the plug.

[blisstik]

Does it really have to be encoded at a dealer? Can't like a GIAC or any of the flash tuners do the same thing as they have the ability to get in the ECU? Might want to check your local tuners so you don't pay up the ass.

@JP: how many miles do you have now?

[David1]

Originally Posted by blisstik

Does it really have to be encoded at a dealer? Can't like a GIAC or any of the flash tuners do the same thing as they have the ability to get in the ECU? Might want to check your local tuners so you don't pay up the ass.

@JP: how many miles do you have now?

Yes, only the dealer for the mean time.

[scalbert]

Originally Posted by blisstik

Does it really have to be encoded at a dealer? Can't like a GIAC or any of the flash tuners do the same thing as they have the ability to get in the ECU?

Not even the GT1 can code injectors which is why it has been a delear only issue. There are two parts to this. BT has cracked it but hasn't added in this feature yet for petrol engines. Appearently the values are coded and what is sent to the DME isn't what is written on the injector. It has to be translated and then written to the DME.

[David1]

Seems like we need one of the secret decoder rings out of a Captain Crunch cereal box!

[vasillalov]

Originally Posted by scalbert

Not even the GT1 can code injectors which is why it has been a delear only issue. There are two parts to this. BT has cracked it but hasn't added in this feature yet for petrol engines. Appearently the values are coded and what is sent to the DME isn't what is written on the injector. It has to be translated and then written to the DME.

True!

Just to clarify, the reason why the injectors have to be coded into the DME is because they are what BMW considers precision instruments. Basically, the injectors have a piezo-electric component inside of them. Piezo-electric elements have different tolerances. So basically, due to manufacturing, each injector will have different tolerances in the piezo-electric component inside it. When the injector comes off the assembly line, it is put through various tests to make sure its working fine. Some of these tests determine those exact tolerances I am talking about. Then these tolerances which are different for each injector, get recorded onto the plastic of the injector.

When an injector needs to be replaced, the DME must be told that those tolerances are. Otherwise, the DME will simply use the previously known values of the previous injector and its own tolerances and the new injector won't work as expected.

Unfortunately, the DME is not capable of determining those injector tolerances on its own. So a trip to the dealer is necessary to recode the injectors.

I am really hoping BavTech tool will offer this soon.

[jpsimon]

thanks for the info guys!


blisstik - i have roughly 49k miles