Chasing down check engine lights isn't always fun. Shoot, let's be honest, they're not fun at all! However, there are those times where we have to put on our detective cap and get to work. This competition orange 2015 Mustang GT had a P0300 and P0308 misfire codes. Quick online research for these codes on gen 2 Coyote engine resulted in the obvious: spark plugs, coil packs, or a compression issue. We checked and troubleshooted all of that with no results. Upon further inspection of the intake manifold, we noticed the driver side IMRC valve wasn't working. The intake manifold was swapped for a GT350 unit and voila, check engine light gone.
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Relative Dyno Information - Run 1:
- Gen 2 Coyote Engine w/ ~97k miles
- MT82 Transmission
- Factory Single Exhaust w/ Weld-in Muffler
- 3.73 Rear Gear
- 19" Wheels w/ 275/40/19 Tires
- 93 Octane Fuel
Relative Dyno Information - Run 2:
- Gen 2 Coyote Engine w/ ~97k miles
- GT350 Intake Manifold
- GT350 Throttle Body
- GT350 Cold Air Intake
- MT82 Transmission
- Factory Single Exhaust w/ Weld-in Muffler
- 3.73 Rear Gear
- 19" Wheels w/ 275/40/19 Tires
- Ford Performance Calibration
- 93 Octane Fuel
Dyno Results:
Run 1
375 Horsepower
- 362 lb-ft Torque
Run 2
404 Horsepower
- 360 lb-ft Torque
