[saleen751]

My 2011 550i is misfiring on bank 1 and 3. I already changed the plugs, coils, injectors and checked the maf sensors. I have pure stage 1 turbos, n63inrake, catless downpipe, exhaust and jb4 beta. I'm not sure if my engine got flooded with meth because I had went through a whole gallon on my way home from pure which is about 100 miles. Only punched it a few times. I think my first mistake was going with the aem meth kit and not the burger version. My mechanic is saying the car overheated and he can see liquid in one of the cylinders. Said he did the pressure test and compression test. Compression is fine but said something about the pressure test that I can't remember. He's saying it could b a blown head gasket and he needs to pull off the heads to verify. The car drives fine until it warms up after 5 min the misfires happens and the drive train malfunction comes on. At this point I'm completely stumped. Could it be the DME? Any way to check it? Would hate to pull apart the motor for no reason. Car has 65k miles. Any help would be greatly appreciated.

[Bmw doubles]

What are your plugs gapped at? Its the easiest check you can do before replacing a head gasket. Spark blowout is overlooked with so many people running aggressive tunes and hardware. Recommended tap down directly from terry is .22, but that's on the N55. I'm down to .20 and it's smooth as butter bogged or not. Stock plugs.

[badblack550xi]

Originally Posted by saleen751

My 2011 550i is misfiring on bank 1 and 3. I already changed the plugs, coils, injectors and checked the maf sensors. I have pure stage 1 turbos, n63inrake, catless downpipe, exhaust and jb4 beta. I'm not sure if my engine got flooded with meth because I had went through a whole gallon on my way home from pure which is about 100 miles. Only punched it a few times. I think my first mistake was going with the aem meth kit and not the burger version. My mechanic is saying the car overheated and he can see liquid in one of the cylinders. Said he did the pressure test and compression test. Compression is fine but said something about the pressure test that I can't remember. He's saying it could b a blown head gasket and he needs to pull off the heads to verify. The car drives fine until it warms up after 5 min the misfires happens and the drive train malfunction comes on. At this point I'm completely stumped. Could it be the DME? Any way to check it? Would hate to pull apart the motor for no reason. Car has 65k miles. Any help would be greatly appreciated.

what was the meth flow ? where is the meth tapped in to ? what was your JB4 setting ?

[saleen751]

The plugs were gapped .20 and I had a brand new set put in after having this issue and same thing. I'm not sure with the meth flow was think it's running cm7 nozzles and I have custom charge pipes made by pure that's where the meth is runjng to. My jb4 setting was custom. Pure and terry worked together, said they made 17 different maps.

[badblack550xi]

Originally Posted by saleen751

The plugs were gapped .20 and I had a brand new set put in after having this issue and same thing. I'm not sure with the meth flow was think it's running cm7 nozzles and I have custom charge pipes made by pure that's where the meth is runjng to. My jb4 setting was custom. Pure and terry worked together, said they made 17 different maps.

weird that while they had the car no issues and on drive home you messed up the engine...