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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Re-installing injector without changing seal or Decoupling



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      11-02-2012, 03:00 PM   #1
joec500
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Re-installing injector without changing seal or Decoupling

Hi,

So I swapped what could have been a bad injector with a new one and the developed a constant mis-fire in that same cylinder, swapped coil and plug and still consistent misfire (cylinder 6). So I grabbed the old injector and re-installed it with the same seal and decoupling unit and the consistent misfire is gone. I have a bunch of injectors en route this week, so I will probably swap it out with one from that batch.

My question is, has anyone else done this? Re-using the same seal and decoupling unit? And if so, any long/middle term issues?

Thanks
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      11-02-2012, 03:32 PM   #2
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If I recall they are one time use so it may leak.
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      11-02-2012, 03:34 PM   #3
joec500
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
If I recall they are one time use so it may leak.
That's what Figured. Well I should have my new injectors by monday or tues.
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      11-02-2012, 10:36 PM   #4
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Every removal or install of a injector, needs a new seal..

Also make sure it sits flush when you install it with the tab.
Once the protective sleeve is removed from the end of the injector, make sure not to touch the tip and make sure you install the injector once the sleeve is removed. the teflon seal can swell and can damage or not sit correctly if you wait long to install it after the protective sleeve is removed.
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      11-02-2012, 11:14 PM   #5
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Did you code the DME for the new injector? If not, that could have caused the misfire.
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      11-03-2012, 10:50 AM   #6
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Quote:
Originally Posted by Eleventeen
Did you code the DME for the new injector? If not, that could have caused the misfire.
Yup I have INPA up and running
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      11-03-2012, 11:25 AM   #7
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Quote:
Originally Posted by joec500 View Post
Yup I have INPA up and running
You should probably reset your short term and long term adaptations after coding since the DME is adapted to your previous injectors and it takes quite a few drive cycles for it to re-learn.
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      11-03-2012, 11:39 AM   #8
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How do you reset adaptations with INPA? I've been wanting to do this but can't find a DIY.
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