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Misfire


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Posted

Now as I’m sure there has been a thousand posts about this subject. I did a search with no luck to what’s going on with my issue

i have a multiple cylinder misfire that I can’t seem to track down.

i have changed the following 

cam (tsp stg 3)

phaser lock out 

lifters 

dod delete 

valve springs 

pushrods 
fuel rails and injectors 

spark plugs twice 

wires 

checked all grounds. 
 

I’ll list the grounds I know about. 
1 pass head to coil harness 

1 pass head to coil harness also chassis 

1 pass block by starter 

1 alt bracket 

1 driver block above vacuum pump 

 

I’ve done cylinder temp checks and they are all over the place. 
And know cyl 7 is not firing at all 

plug came out smelling of fuel but no heat or carbon marks. 
 

please help 

Posted

Safe to assume a tune was done and all that to turn off all the AFM/DoD stuff first?

 

Did you move the coils around??

 

Is there power at the #7 coil?

Posted

Yes dod, afm have been turned off. Tuner said it’s not mechanical as in cam timings as no codes present. 
 

I haven’t moved coils around as that’s my next move. But what’s weird is the exhaust temps. Which makes me lean towards multiple misfires 

 

as for #7 having power I haven’t checked 

 

attached is a pic of cylinder temps 

E6BF69D1-7341-4569-AE8C-D6C96AB543C2.png

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