[MashoodSharaf]

I've read about people adding fuel cleaners like techron to their cars and not making a difference. Is it possible to remove the injectors physically and just wipe them clean? If yes, will it require coding when reinstalling? I seem to be getting a rough idle and ses light coming on. I have a jb4, Dci, and Cobb cp. Or is it my intake valves that need to be cleaned by walnut blasting method? Thanks

[CptJoe732]

Try this. Spark plug > coil > injector.

Walnut blasting will give you a smoother idle but gunked up valves have no real way to throw a code. Check your plugs, usually one bank goes before the others in terms of injectors.

[808AWD325xi]

Originally Posted by MashoodSharaf

I've read about people adding fuel cleaners like techron to their cars and not making a difference. Is it possible to remove the injectors physically and just wipe them clean? If yes, will it require coding when reinstalling? I seem to be getting a rough idle and ses light coming on. I have a jb4, Dci, and Cobb cp. Or is it my intake valves that need to be cleaned by walnut blasting method? Thanks

If you remove an injector to inspect it, you will need to replace the PTFE sealing ring. That requires a BMW Group tool. P/N for the tool is 83 30 0 495 756.

Per the Bentley manual, use a lint-free cloth to remove combustion residue from the cylindrical part of the injector tip. Do not clean the injector tip.

A shop could probably thoroughly clean the injectors with an ultrasonic cleaning machine.

If your careful to re-install the injectors into the same cylinders from which they were removed, calibration with INPA would not be required. If an injector is replaced, then calibration would be required.

If you decide to inspect/clean your injectors, you should also inspect your spark plugs as well. A fouled plug that smells like gasoline is a solid indicator of a leaking injector that needs to be replaced.

[MashoodSharaf]

Originally Posted by CptJoe732

Try this. Spark plug > coil > injector.

Walnut blasting will give you a smoother idle but gunked up valves have no real way to throw a code. Check your plugs, usually one bank goes before the others in terms of injectors.

Okay I'll probably change out my spark plugs soon anyway. Thanks. But this only happens sometimes. I guess I wasn't thorough enough. When I put my car in map 1 and floor it, the car sometimes stutters and shakes and the ses light comes on and bam, rough idle like crazy. It feel likes the car is dying. So I stop the car and restart it to it being Normal again. I use auto tune map 5 but all is well. Maybe intake valves need to be cleaned regardless. Car has 72k miles. It's part of regular maintenance :P

[Milan]

They are probably leaking and not dirty....I would replace them all, especially if they aren't the latest revision

[MashoodSharaf]

Originally Posted by Milan

They are probably leaking and not dirty....I would replace them all, especially if they aren't the latest revision

The injectors?

[N54Society]

Originally Posted by MashoodSharaf

The injectors?

Yes. Check Rockauto.com out. They seem to have the latest revision for the cheapest price. I just bought one injector from them.

Read this thread:

http://www.e90post.com/forums/showthread.php?t=1118247

Latest: 13538616079 (you may not find these but any index 12 should be ok)
Previous: 13537585261 (index 11+ should be ok)
Original: 13537565138


If you find out your injectors are older than 11, you need to replace all three injectors in that bank. There are two banks, three injectors in each. They need to be 11+ to play along nicely. If you have one 10 and two 11+ in that bank, it won't work right. You should basically upgrade to 11+ injectors.

[MashoodSharaf]

Originally Posted by vbp6us

Yes. Check Rockauto.com out. They seem to have the latest revision for the cheapest price. I just bought one injector from them.

Read this thread:

http://www.e90post.com/forums/showthread.php?t=1118247

Latest: 13538616079 (you may not find these but any index 12 should be ok)
Previous: 13537585261 (index 11+ should be ok)
Original: 13537565138


If you find out your injectors are older than 11, you need to replace all three injectors in that bank. There are two banks, three injectors in each. They need to be 11+ to play along nicely. If you have one 10 and two 11+ in that bank, it won't work right. You should basically upgrade to 11+ injectors.

Thanks a lot man. I needed this a lot. I will look into it!

[TrAcK TRaP]

My car still has original injectors 04/07 with index 1.. I am FBO running Cobb E30 map everyday. Last dyno was 403whp 409wtq no single misfire knock on the wood..

[CptJoe732]

Originally Posted by MashoodSharaf

Okay I'll probably change out my spark plugs soon anyway. Thanks. But this only happens sometimes. I guess I wasn't thorough enough. When I put my car in map 1 and floor it, the car sometimes stutters and shakes and the ses light comes on and bam, rough idle like crazy. It feel likes the car is dying. So I stop the car and restart it to it being Normal again. I use auto tune map 5 but all is well. Maybe intake valves need to be cleaned regardless. Car has 72k miles. It's part of regular maintenance :P

That's a misfire. Change your plugs and go from there.

[MashoodSharaf]

Originally Posted by CptJoe732

That's a misfire. Change your plugs and go from there.

Yeah you guys are right. I'm like 99% it is plugs because I had a friend who would also push his car and the ses light would turn on and idle rough. Plus last time I changed them was around 45k miles and I'm at 72k. Thanks guys.