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AZN54 AZN54 is offline
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Default Testing Injectors - Quick Question - 07-13-2016, 03:24 PM

I believe I have a leaky injector/s and plan to test them this weekend. Just had new OEM turbos installed, so don't have the JB4 in to check logs right now. Question is, has anyone used the testing method in the below video or have any additional tips? Looks pretty cut and dry.

More importantly, will I need to replace the injector seals and/or decoupling elements because I'm pulling them?

https://www.youtube.com/watch?v=N-cliDST_vc

Much appreciated.


2009 135i
DOC Race 6266 Single, VS DW400 LPFP, VRSF Race FMIC, Motiv BoostBox, Tuned by Wedge

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3.1L Z 3.1L Z is offline
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Default 07-13-2016, 05:05 PM

U can reuse the decouplers if you do it. I've wondering about that same video before. Technically you would have a hard time getting the injectors back in due to the seals expanding. I would simply run the motor so it exhibits the problem of a bad injector then check each one looking for a wet plug.
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AZN54 AZN54 is offline
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Default 07-14-2016, 07:38 AM

Thanks for the response.

The major sign I'm getting of a bad injector is a rough cold start after sitting over night or long period of time; warm start-up is fine. It settles down after initial cold start is over. Thereís also a slight rough idle when warmed and at a stop, but nothing like a cold start. No misfires or issues during WOT; bearing in mind Iím on stock tune right now. I checked plugs when I first noticed it and they looked fine, only had about 5,000 miles on them. Valve cleaning was done about 7,000 miles ago. Other than taking a log, I'm thinking the test in the video might be the best way to confirm itís an injector. Iíll reinstall the JB4 this weekend and see if there is anything obvious before pulling them.

"Technically you would have a hard time getting the injectors back in due to the seals expanding."
Any idea if this would be true even if I replaced the seals with new ones?


2009 135i
DOC Race 6266 Single, VS DW400 LPFP, VRSF Race FMIC, Motiv BoostBox, Tuned by Wedge

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alpinedevil335 alpinedevil335 is offline
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Default 07-14-2016, 07:54 AM

Quote:
Originally Posted by AZN54

"Technically you would have a hard time getting the injectors back in due to the seals expanding."
Any idea if this would be true even if I replaced the seals with new ones?
Just don't install the new seals until after you have performed the test.
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AZN54 AZN54 is offline
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Default 07-14-2016, 08:01 AM

Quote:
Originally Posted by alpinedevil335
Just don't install the new seals until after you have performed the test.
Thank you, appreciate the tip.

That was the plan, wait until I am ready to put them back in and swap seals at that point.


2009 135i
DOC Race 6266 Single, VS DW400 LPFP, VRSF Race FMIC, Motiv BoostBox, Tuned by Wedge

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Sw4y1313 Sw4y1313 is offline
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Default 07-14-2016, 10:25 AM

If you do remove an injector, you have to put a new seal on it. If not, the seal will not go in correctly, causing gases to escape during compression torching the hole the injector sits in. You will then need a shop to make a custom seal to fit the newly enlarged hole or buy a new head. The seals are $2 a piece. I purchased this seal kit and it works great. It's also the cheapest one out there. If you are in the PNW you can borrow mine.


2008 E92 AW 335xi 6MT: VTT GC Turbos w/ Inlets n Outlet + JB4 + Custom BEF + BMS CP + BMS Meth kit & TwistedTuning DP Meth Plate + 6 Aquamist .4mm Nozzles & 350cc 7th nozzle.
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mojo20032004 mojo20032004 is offline
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Default 07-14-2016, 01:04 PM

I've never had issues with the seals. Even bought used injectors from ppl, threw them on without issues.coded and been fine for 7k now.


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Levan-i Levan-i is offline
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Default 07-14-2016, 01:12 PM

I made that video,

did not had any problem with seals, running Single Turbo


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AZN54 AZN54 is offline
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Default 07-14-2016, 04:02 PM

Quote:
Originally Posted by Sw4y1313
If you do remove an injector, you have to put a new seal on it. If not, the seal will not go in correctly, causing gases to escape during compression torching the hole the injector sits in. You will then need a shop to make a custom seal to fit the newly enlarged hole or buy a new head. The seals are $2 a piece. I purchased this seal kit and it works great. It's also the cheapest one out there. If you are in the PNW you can borrow mine.
Thanks for the info. I'm down in AZ, but appreciate the offer.

If I did replace the seal, is it not just as easy as replacing something like an o-ring? Obviously, it's not an o-ring and Iíd get the proper seal, but it looks like the original can just be taken of and the new one slid into place; then back into the head. Not sure what the seal kit would be for(?) I donít have prior experience with these injectors nor have I seen one in-person, so maybe thereís more to it than I'm seeing. Thanks again.


Quote:
Originally Posted by Levan-i
I made that video,

did not had any problem with seals, running Single Turbo
Thanks for the video and for replying! So it's as simple as pulling the injector out, rotating it 180deg and cranking to see if one or more spray? If so, seems like a pretty simplistic was to identify a bad one. This seal replacement has me a little concerned, but nothing thatíll stop me from replacing them or giving this a shot.


2009 135i
DOC Race 6266 Single, VS DW400 LPFP, VRSF Race FMIC, Motiv BoostBox, Tuned by Wedge

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eaton18spd eaton18spd is offline
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Default 07-14-2016, 05:06 PM

There is a special tool that shrinks the seal down once you install it. Then once you install the injector the seal will expand in the hole.
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AZN54 AZN54 is offline
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Default 07-15-2016, 09:13 AM

Quote:
Originally Posted by eaton18spd
There is a special tool that shrinks the seal down once you install it. Then once you install the injector the seal will expand in the hole.
Thank you for further explaining.

Sounds like it's not as easy as just pulling, testing, and replacing. Maybe I'll hold off on this until last resort. I'll install JB4 on Saturday (itís yourís on Sunday, Tyler) and get a cold startup log, hopefully thatíll give some further indication on which injector/bank is bad.


2009 135i
DOC Race 6266 Single, VS DW400 LPFP, VRSF Race FMIC, Motiv BoostBox, Tuned by Wedge

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Levan-i Levan-i is offline
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Default 07-15-2016, 09:42 PM

Quote:
Originally Posted by AZN54
Thanks for the video and for replying! So it's as simple as pulling the injector out, rotating it 180deg and cranking to see if one or more spray? If so, seems like a pretty simplistic was to identify a bad one. This seal replacement has me a little concerned, but nothing thatíll stop me from replacing them or giving this a shot.
thats correct, just don't connect signal wires to them


2007 E92 335
ST - GTW3684
JB4 G5, ST Pump Flash, Fuel-It Stage 1, Meth
MT (after swap),
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