Re-installing injector without changing seal or Decoupling

joec500 · 11-02-2012, 03:00 PM

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

Jeff@TopGearSolutions · 11-02-2012, 03:32 PM

If I recall they are one time use so it may leak.

joec500 · 11-02-2012, 03:34 PM

Quote:

Originally Posted by Jeff@topgearsolutions

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.

Bagelfast · 11-02-2012, 10:36 PM

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.

Eleventeen · 11-02-2012, 11:14 PM

Did you code the DME for the new injector? If not, that could have caused the misfire.

joec500 · 11-03-2012, 10:50 AM

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

Ilma · 11-03-2012, 11:25 AM

Quote:

Originally Posted by joec500

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.

bigdnno98 · 11-03-2012, 11:39 AM

How do you reset adaptations with INPA? I've been wanting to do this but can't find a DIY.

11-02-2012, 03:00 PM	#1
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	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 __________________ 2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch
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11-02-2012, 03:32 PM	#2
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	If I recall they are one time use so it may leak.
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11-02-2012, 10:36 PM	#4
Bagelfast Lieutenant Colonel 125 Rep 1,546 Posts Drives: BMW Join Date: Sep 2008 Location: USA iTrader: (0)	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
Eleventeen Second Lieutenant 30 Rep 288 Posts Drives: G42 M240i Join Date: May 2009 Location: South Jersey iTrader: (3)	Did you code the DME for the new injector? If not, that could have caused the misfire. __________________ G42 M240i xDrive
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11-03-2012, 11:39 AM	#8
bigdnno98 Real Car Enthusiast 288 Rep 2,082 Posts Drives: 340xi Join Date: Jul 2011 Location: Germany iTrader: (8)	How do you reset adaptations with INPA? I've been wanting to do this but can't find a DIY.
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