The best way to find to find a misfire on a 2.7t is to read MVB ( messure Value Blocks ) in this order...
1. BLOCK 32-- ( FUELING ) adaptations should be no more / less than 10% ever !
2. BLOCK 111 -( TURBO ) adaptations should not be more / less than 10% . If over 10% you might have a boost leak or dying N75
3. BLOCK 93-- ( CAMSHAFT ) adaptation should be never over 12%. perfect would be 4% or less.
4. BLOCK 14,15,16 ( MISFIRE COUNTER ) it should never be over 5 misfires per minute ideally. More than 55+ will set a MIL / CEL
TIPS : ...If the fueling is in the negitive around -12% or lower ( I.E -13% ..,-15% ..,-25%) in MVB 32 and the turbo adaptations are over 10-12+% or more ....you have a boost leak . or a real crappy tune
... ----->If you have EGT fault codes that too will give you crappy performance and missfires..<----
... -----> the camshaft correlation timing has to be good other wise that too will give you misfires ( MVB 90 , 91, 92 , 93 ) MVB 93 is the important one.
Other things that cause misfires
.... injector dwell is crappy or dying injectors
.... intake manifold gasket
.... combie valve stuck open
.... low fuel pressure
.... bad fuel pressure regulator
.... ***** plug gap is over .028" *****<<<<-------------!!!!!!!
.... the ignition units are junk ( POS / ICU )
.... *****clogged fuel filter ***** <--------!!
I hope this helps
Lee
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