Thread: N54 Backfiring?
View Single Post
      07-11-2011, 07:15 PM   #8
IGoFast1589's Avatar
Drives: 08 135i
Join Date: Nov 2010
Location: NY

Posts: 654
iTrader: (2)

It's unburned fuel detonating in the exhaust because the exhaust is so hot it causes it to ignite. They're not massive explosions because only a little unburned fuel gets there.
IGoFast1589 is offline  
Reply With Quote