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E82 / E88 1 Series (2008 - 2013)
BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by either an inline 6 in the 128 or the twin turbo rocket sled 135.

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Old 09-30-2012, 11:14 AM
brandon.hilly@g brandon.hilly@g is offline
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Location: oklahoma,usa
 
Join Date: Sep 2012
Posts: 2
Mein Auto: Bmw 135i
bmw 135i , low boost

my bmw 135i has the jb4 system on.the car was boosting 1.3psi and all of a sudden it came down to .08psi.Is there a problem with the blow off valve spring, any suggestions will help.
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Old 10-11-2012, 09:59 AM
Ryan...'s Avatar
Ryan... Ryan... is offline
Please, call me Brian.
Location: Madison WI
 
Join Date: Dec 2008
Posts: 10,603
Mein Auto: Ducati 916
Do you hear anything that sounds like a vac leak? I would check all the rubber and silicone connections to make sure they're fitted tightly. Boosted cars can react very oddly to even the smallest of leaks, so I'd start there
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