P0316 / P0308 Misfire Issue

[2KWIK4U]

I have a 2017 Roush Stage 3. I took it to a very reputable performance shop and had it upgraded from Phase 1 to Phase 2, (pulley, fuel control module and tune). Shortly after I started getting P0308 and P0316. Changed the plug and swapped the coil pack with the #7 cylinder to see if the issue followed the coil pack. It did not. So I'm like WTF???

Here's where I'm thinking...
Fuel injector possibly stuck open? Maybe the fuel control module sending more fuel to the injector messed it up???
Of course it's the #8 piston, so it is a total PITA to get to since the throttle body is sitting right above it.

Any help would be appreciated more than you can imagine!

Sponsored

 

[Basspro302]

Compression test, swap inj around if compression is ok.

 

[2KWIK4U]

Compression test, swap inj around if compression is ok.

Yeah my next step is to swap around the injector. I'll have to find the torque values for the supercharger, because it will more than likely need to be removed. I might be lucky and just be able to remove the throttle body assembly, but I don't think so...

 

[Grimreaper]

No need to pull bower just the Tb and elbow.

 

[2KWIK4U]

I wasn’t sure about that. Do you know the torque values for the elbow and throttlebody?

Sponsored