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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 > Why didn't I think abt that??? (leaky injector)



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      07-10-2015, 02:16 PM   #1
007_e350
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Why didn't I think abt that??? (leaky injector)

I think this's an excellent idea to test for leaking injector(s), stole it from the web lol


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      07-10-2015, 02:20 PM   #2
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Interesting!

I guess the rail pressure is high enough when cranking over to get them to leak.
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      07-10-2015, 02:32 PM   #3
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Quote:
stole it from the web lol
no worries, i'm author of this video
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      07-10-2015, 02:34 PM   #4
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Quote:
Originally Posted by ferocity02 View Post
Interesting!

I guess the rail pressure is high enough when cranking over to get them to leak.
I don't think they should ever leak without electric pulse, also all should leak in that case why just one
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      07-10-2015, 02:50 PM   #5
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Or u can pull the plug and smell it as it sits overnight
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      07-10-2015, 02:52 PM   #6
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other option is to disconnect all injectors, and then turn the starter,
if you listen carefully you can determine if the ignition is happening
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      07-10-2015, 02:56 PM   #7
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OK, I'll ask the dumb question. If you are cranking the engine, why wouldn't all injectors spray?

edit- or is just the fuel line connected and not the electrical connection?
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      07-10-2015, 03:04 PM   #8
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edit- or is just the fuel line connected and not the electrical connection?
correct, no electrical connections, so its fuel pressure from rail only
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      07-10-2015, 03:05 PM   #9
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Quote:
Originally Posted by davidwarren View Post
OK, I'll ask the dumb question. If you are cranking the engine, why wouldn't all injectors spray?

edit- or is just the fuel line connected and not the electrical connection?
Fuel line is connected but not the electrical. So the video is showing the injector spaying fuel without any signal, hence leaking
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      07-10-2015, 04:26 PM   #10
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This is genius, only it may be more difficult to pull all the injectors rather than the plugs.
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      07-10-2015, 04:33 PM   #11
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Quote:
Originally Posted by Levanime View Post
no worries, i'm author of this video
ooops sorry, but this is ingenious!!

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      07-10-2015, 04:34 PM   #12
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Quote:
Originally Posted by KeepRidingDirty View Post
This is genius, only it may be more difficult to pull all the injectors rather than the plugs.
still better than blindly replacing injectors, we've all done that right/?
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      07-10-2015, 05:59 PM   #13
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Quote:
Originally Posted by 007_e350 View Post
still better than blindly replacing injectors, we've all done that right/?
Ooooo ya. When in doubt replace them all.....That's how you do it right?
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      07-11-2015, 12:31 AM   #14
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dude this is awesome and has win written all over it.. well, because I just ordered 3 injectors and was going to "hope" i was replacing the right ones..!! This looks like a dead giveaway at what injectors will be faulty..! Thanks brother..!! :cheers:

So just unplug the electrical connectors, and push and hold the start button..??
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      07-11-2015, 12:45 AM   #15
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Brilliant.. 😄
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      07-12-2015, 10:24 AM   #16
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Plus if you look closely it's pretty obvious that the one leaking has a much darker tip from build up as well just in case your injector may not be leaking too bad or at all during this test.
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      07-12-2015, 01:39 PM   #17
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Nice. Been a while since I've seen a valuable thread.
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      07-13-2015, 07:47 AM   #18
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      07-13-2015, 10:11 AM   #19
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Quote:
Originally Posted by Levanime View Post
no worries, i'm author of this video
Good idea, you can also see that the same injector has much more fouling on the tip.
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      07-14-2015, 09:07 AM   #20
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Levanime would you mind letting me know the steps you did to get the injectors in that position? Also, did you reuse the decoupling elements from the injectors that were not replaced..??
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      07-14-2015, 01:17 PM   #21
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who has the proper procedure for this? Just unplug electrical harness and try to crank the motor?
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      07-14-2015, 01:18 PM   #22
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Quote:
Originally Posted by MadeInPhilly View Post
who has the proper procedure for this? Just unplug electrical harness and try to crank the motor?
looks like it
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