Blown rear turbo? No smoke

byebyev8 · 06-20-2017, 05:04 PM

My 335i has no boost 1psi on the jb4. I replaced the outlets because I thought there was a hole. Not the problem. Replaced the dvs, charge pipe o ring, and replaced all the vacuum lines and Boost solenoids.Took the intercooler off and back on multiple times. I checked the front turbo for shaft play and it feels like a brand new turbo. The rear inlet seem's to not be on 100% all the way but it's on there so I don't think that would cause no boost. Car sounds like a siren. Would one turbo being out cause no boost.

ty-jelly · 06-20-2017, 07:02 PM

I had a similiar situation. Turbo siren, no boost, no smoke.

Ended up being a blown rear turbo. Next step is when the seals completely let go and you snoke out the streets.

If you want to be certain remove the rear downpipe and check for oil.

ken335AZ · 06-20-2017, 10:19 PM

Try removing the JB4 and see if it helps. This just happened to me with mine and now I have to hunt down some harness gremlins in it.

06-20-2017, 05:04 PM	#1
byebyev8 Private First Class 81 Rep 185 Posts Drives: e92 335i f12 m6 Join Date: May 2014 Location: Kenosha wi iTrader: (1)	Blown rear turbo? No smoke My 335i has no boost 1psi on the jb4. I replaced the outlets because I thought there was a hole. Not the problem. Replaced the dvs, charge pipe o ring, and replaced all the vacuum lines and Boost solenoids.Took the intercooler off and back on multiple times. I checked the front turbo for shaft play and it feels like a brand new turbo. The rear inlet seem's to not be on 100% all the way but it's on there so I don't think that would cause no boost. Car sounds like a siren. Would one turbo being out cause no boost.
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06-20-2017, 07:02 PM	#2
ty-jelly New Member 3 Rep 19 Posts Drives: 2001 LSB M3 Join Date: May 2012 Location: PA iTrader: (0)	I had a similiar situation. Turbo siren, no boost, no smoke. Ended up being a blown rear turbo. Next step is when the seals completely let go and you snoke out the streets. If you want to be certain remove the rear downpipe and check for oil.
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06-20-2017, 10:19 PM	#3
ken335AZ Yeah it's got a welded diff 39 Rep 56 Posts Drives: '07 e92 FBO, JB4+BEF, E85+Meth Join Date: Oct 2012 Location: Syracuse, NY/Tucson, AZ iTrader: (0)	Try removing the JB4 and see if it helps. This just happened to me with mine and now I have to hunt down some harness gremlins in it.
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