m3 e36 s50b30 Misfire on #5 #6

[Peejay]

have you checked the coil packs?

 

[Beemergeek]

Yes, replaced 5 & 6 with coils from my dad's car. Also swapped coil 4 & 6 with no change. Am I correct in saying that as Moranor said a wet test would indicate that the head gasket might be fine but then it could only be piston rings or valves that cause compression loss. As born2boost said earlier in this thread the gasket could be blown between the cylinders causing compression sharing. I hope its only the gasket and the internals are still ok I didn't budget for a rebuild

 

[moranor@axis]

i think born2boost nailed this one... wet test is probably pointless what are the chances of it not being the gasket if both cyl have no compression...

 

[Peejay]

have the codes read and double check the crank sensor

 

[Beemergeek]

there was one code voltage supply to control unit but was solved after it was cleared. I may still have a problem with my cps but it wouldn't cause the low comression reading on 5 & 6.

 

[born2boost]

If its blown between the cylinders...chances are you will only need a new gasket. Nothing else....This, if the car never overheated.

Obviously the head and surface of the block must be inspected anyway before reassembling.

 

[Beemergeek]

If its blown between the cylinders...chances are you will only need a new gasket. Nothing else....This, if the car never overheated.

Obviously the head and surface of the block must be inspected anyway before reassembling.

Thanx dude, it was the head gasket only. My dad and I did all the work ourselves. PO installed a no name cheap gasket thats probably why it burned through between 5 & 6. I replaced it with a Victor Reinz this time. Fired her up last night and misfire is gone.:joy:

 

[moranor@axis]

:rollsmile:

 

[B16A4]

If its blown between the cylinders...chances are you will only need a new gasket. Nothing else....This, if the car never overheated.

Obviously the head and surface of the block must be inspected anyway before reassembling.

Thanx dude, it was the head gasket only. My dad and I did all the work ourselves. PO installed a no name cheap gasket thats probably why it burned through between 5 & 6. I replaced it with a Victor Reinz this time. Fired her up last night and misfire is gone.:joy:

that was a very brave attempt you tookraise:. i m certain everytime you turn the key you gonna be all smiles coz you did it yourselves:thumbs:

 

[444YYY]

If its blown between the cylinders...chances are you will only need a new gasket. Nothing else....This, if the car never overheated.

Obviously the head and surface of the block must be inspected anyway before reassembling.

Thanx dude, it was the head gasket only. My dad and I did all the work ourselves. PO installed a no name cheap gasket thats probably why it burned through between 5 & 6. I replaced it with a Victor Reinz this time. Fired her up last night and misfire is gone.:joy:

Good going!!! :thumbs:

 

[born2boost]

Well done! Glad you came right...:=):

 

[sb447]

:thumbdo: not a nice feeling to see these things happen

 

[hoosain]

:thumbs: well done sorting the problem out

 

[bimmer330]

Had the same problem once. Also gives you chance to have a look at cylinder wear and clean some intake parts.:thumbs:

 

[Beemergeek]

Thanx guys:thumbs: