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2020 Accord Sport 2.0t
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51 Posts
Discussion Starter · #1 ·
Need some help guys.

I'm trying to track down a consistent Cylinder 1 misfire when under strong acceleration. It doesnt necessarily have to be at WOT.

Vehicle:
2020 Accord Sport 2.0t 10AT

Mods:
Full bolt-on
MHI Stage 2 Turbo
Flex Fuel
AEM Methanol Injection
Big Bore throttle body
Ported intake
Ported fuel rail
Ported fuel pipe


Things I've eliminated:

High pressure Fuel Pump
Low pressure Fuel Pump
Plugs
Coils
Injectors
Valves / Springs (ok & adjusted)
Compression Test is good
Leak down test is good
Boroscope with no sign of internal dmg
Tune

Any thoughts or suggestions would be much appreciated as I'm quite frustrated with the lack of a resolution thus far.

Thanks,
 

· Registered
2020 Accord Sport 2.0t
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51 Posts
Discussion Starter · #4 ·
Update

While running a Boroscope into cylinder 1, we did a coolant pressure test. Lo' and behold there was some pretty blue coolant flowing in. So a blown headgasket is confirmed on the intake side.

I've already ordered ARP head studs for an FK8 and will go back with the OEM headgasket.
 

· Registered
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43 Posts
I was about to say blown head gasket. Every time anyone posts about a cylinder 1 misfire it seems to always end up being a blown head gasket. is yours a 1.5T or 2.0T?
 

· Registered
2018 Accord Sport 2.0T, Downpipe, ktuner phearable stage 4, flex fuel, intake.
Joined
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33 Posts
glad you found the solution! random question for OP: did you notice a difference with the big bore throttle body installed?
 
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