M156 AMG compression problems!
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w212 E63 AMG
M156 AMG compression problems!
hello
My car is weistec st3, I have repaired the engine pistons on weistec, after that i have problems, Almost everything about the car changed, but Did not help,The engine still works unevenly has missfires,Compression is checked and found to be in the driver's side cylinders (5,6,7,8) has 13.5 and 1,2,3,4 cylinders 12.5
Thanks in advance for your thoughts
My car is weistec st3, I have repaired the engine pistons on weistec, after that i have problems, Almost everything about the car changed, but Did not help,The engine still works unevenly has missfires,Compression is checked and found to be in the driver's side cylinders (5,6,7,8) has 13.5 and 1,2,3,4 cylinders 12.5
Thanks in advance for your thoughts
MBWorld Fanatic!
Joined: Apr 2008
Posts: 1,399
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From: Bay Area, California
2015 E63s AMG, 2020 GLC 43 AMG
hello
My car is weistec st3, I have repaired the engine pistons on weistec, after that i have problems, Almost everything about the car changed, but Did not help,The engine still works unevenly has missfires,Compression is checked and found to be in the driver's side cylinders (5,6,7,8) has 13.5 and 1,2,3,4 cylinders 12.5
Thanks in advance for your thoughts
My car is weistec st3, I have repaired the engine pistons on weistec, after that i have problems, Almost everything about the car changed, but Did not help,The engine still works unevenly has missfires,Compression is checked and found to be in the driver's side cylinders (5,6,7,8) has 13.5 and 1,2,3,4 cylinders 12.5
Thanks in advance for your thoughts
The head gasket issue could be the result of a failing head bolt or 2. Your compression numbers clearly are for a normally aspirated motor which means M156. 2010 or older by any chance?
Good luck. Let us know if you figure it out
MBWorld Fanatic!
Joined: Apr 2008
Posts: 1,399
Likes: 202
From: Bay Area, California
2015 E63s AMG, 2020 GLC 43 AMG
Gotcha. But the consistent 8% compression difference seems strange to me. Did you say you changed pistons recently? I assume, of course, if you did you changed all 8 right with 8 identicle ones? Lol
Cant think of another way to explain compression difference the way you describe other than maybe a valve difference between left and right heads.
Any case, it sounds like you have made large changes to your motor so without knowing all the details its hard to speculate.
Good luck
Cant think of another way to explain compression difference the way you describe other than maybe a valve difference between left and right heads.
Any case, it sounds like you have made large changes to your motor so without knowing all the details its hard to speculate.
Good luck
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
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From: miami / delray beach
2014 E63s amg 4matic, 2009 C63, 2006 E55 AMG , 2001.5 AUDI S4 stg 3+ w/meth
My experience is if one side is lower then the other, and head gasket has been ruled out, then it's probably cam timing.. ive seen up to 30psi from one side to the other when got timing wrong on old svt
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