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E28 (1982 - 1988)

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  #1  
Old 09-22-2009, 07:40 AM
codymccann codymccann is offline
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Location: connecticut
 
Join Date: Aug 2009
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Mein Auto: 1986 535i
Exclamation 535i gas leaking.need help.

i have a 1986 535i and i thought one of my injector o-rings was bad but today i started her up and there is gas leaking out of under the 4th fuel injector. could this still be the o ring? there is A LOT of gas coming out while it is running. could it be a Idle Speed Regulator, or Fuel Pressure Regulator? need help. thanks.
Cody.

Last edited by codymccann; 09-22-2009 at 10:00 AM.
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  #2  
Old 09-22-2009, 12:05 PM
hugh1850's Avatar
hugh1850 hugh1850 is offline
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Join Date: Jun 2003
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Mein Auto: M3
Quote:
Originally Posted by codymccann View Post
i have a 1986 535i and i thought one of my injector o-rings was bad but today i started her up and there is gas leaking out of under the 4th fuel injector. could this still be the o ring? there is A LOT of gas coming out while it is running. could it be a Idle Speed Regulator, or Fuel Pressure Regulator? need help. thanks.
Cody.
It might be the cold start valve (CSV). The CSV is fueled from the fuel rail at about the place you are having your proplem. The best way to see it is to remove the intake boot, along with the idle control valve and vacuum hose. The CSV sits in the intake manifold. It's pretty common for the fuel hose that runs off the fuel rail to the CSV to crack and leak.

Here's a great write-up talking about the issue:

http://www.mye28.com/viewtopic.php?t=17341

Part no. 9

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Last edited by hugh1850; 09-22-2009 at 12:07 PM.
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