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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 > Gas coming out of exhaust on a cold start



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      10-09-2012, 04:20 PM   #1
jetblackcoupe
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I have procede v5, dci, catless dp's.... Idle is rough as usual but I've been noticing that it's spitting raw gas out of the exhaust (usually only on the initial startup, sometimes afterwards too) ... What could this mean?
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      10-09-2012, 04:36 PM   #2
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I have procede v5, dci, catless dp's.... Idle is rough as usual but I've been noticing that it's spitting raw gas out of the exhaust (usually only on the initial startup, sometimes afterwards too) ... What could this mean?
How sure are you its gas??...sounds like water / condensation
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      10-09-2012, 04:43 PM   #3
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Yep, that's just water. The exhaust is always full of water - natural product of combustion - and it blows out in liquid form when the exhaust is cold. Once it heats up, you won't see any liquid, it will all be vapor.
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      10-09-2012, 06:14 PM   #4
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smelled like gas so i assumed it was gas
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      10-09-2012, 06:15 PM   #5
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It's water, my car does the same.
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      10-09-2012, 07:09 PM   #6
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put a match to it and see
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      10-09-2012, 07:54 PM   #7
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put a match to it and see


You gonna light this or what!

best idea ever.

Although it is just water.
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      10-09-2012, 09:42 PM   #8
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When my injectors went my car was spitting fuel out the exhaust, I was told that a couple of the injectors got stuck open. Idle was super rough, like running on 2 cylinders kinda rough.
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      10-09-2012, 09:45 PM   #9
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Quote:
Originally Posted by Jeller
When my injectors went my car was spitting fuel out the exhaust, I was told that a couple of the injectors got stuck open. Idle was super rough, like running on 2 cylinders kinda rough.
Did that only happen on cold starts or at all times?
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      12-18-2012, 06:55 AM   #10
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definatly injectors stuck upen!! find out which injectors are missfiring and have them replaced imidiatly. be caurfull as may hydrolock causing cylinder/rod damage! so dont drive. problem should go away after waiting and a few starts of motor. i had same problem, its getting fixed now, it dosent happen all the time, only some cold starts after the car has been thrashed, so if its been thrashed on friday night, on saurday it will play up. the problem fixes itself once engine warmes up. you should be getting a low fuel pressure code aswell but dont worry fuel pump should be fine unless car has long cranks. low pressure fuel code is caused by injector just dumping fuel constantly spraying at full ball relieving too much fuel pressure out of the fuel rail. and obviously with too much fuel car wont ignight fuel therefore missfire. and it will sound like V8

anyways hope u fixed your problem
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      12-18-2012, 08:07 AM   #11
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Taste/drink it. Nothing will happen to you, happens all the time when you try to suck gasoline out of gas tank
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      12-18-2012, 08:12 AM   #12
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Taste/drink it. Nothing will happen to you, happens all the time when you try to suck gasoline out of gas tank
I wouldn't even want to taste water that made its way through my exhaust.
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      12-18-2012, 08:33 AM   #13
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Quote:
Originally Posted by jetblackcoupe View Post
Did that only happen on cold starts or at all times?
It only happened really bad once, had a couple hiccups prior to the last time, but it would come and go, after that I took it to the dealer and got all new injectors. Keep in mind it was a really really rough idle, you will know it for sure when/if it happens.
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      12-18-2012, 05:27 PM   #14
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smelled like gas so i assumed it was gas
arent you catless?
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      12-18-2012, 10:10 PM   #15
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It's water, my car does the same.
Is that before or after it back fires. Oh, my bad... It's just your Vishnu Exhaust making noises.
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      12-18-2012, 10:47 PM   #16
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when my injector failed, I got gas out of my exhaust.
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