auric

Car is 2006 Bone Stock (on street tires).

On my last session, I noticed car was idling poorly, but revved smoothly. No smoke. Just mild hesitation @ idle. I took the car out for a few easy laps to asses the car further. While on track I noticed no hesitation and saw no flashing/check engine light. When I got back to the paddock I ran my ODBII sensor and saw a code that said "fuel cap loose." I checked the cap, and it wasn't loose. So I removed, let it sit for a few seconds and the error did not go away. So I turned car off and reset the code with my ODBII dongle.

On the way back home I noticed the hesitate for a few seconds @ 4000 rpm, only happened once then car felt smooth.

When I got home I see the following codes:
- P0301: Cylinder 1 Misfire
- P1454: Manufacture Defined
- P2422: Evaporative Emission System Vent Valve Stuck Closed.

At this point I'm hoping its not something severe. I wanted to start the EVAP system vent valve. Anyone have any clue?
- Anyone care to shed some light?

THanks.

Chuck S

Loose fuel cap on a 2006 and later will (or should) display "CHECK FUEL CAP" in the message center in the dash display. I had this one (1) time. Can't help with a solution (but am interested). I don't have a code reader. Maybe because I'd check it all the time. Let us know the solution.

-- Chuck

eight

It's your fuel tank pressure sensor

Had the same 2 codes. P1454 directly refers to your fuel tank pressure sensor and will cause P2422 to trigger. I replaced the sensor and everything was fine. In the worst case, it's your shutoff valve, it's going to be pretty pricey when I was looking into it. I just took the gamble and replaced the sensor hoping it wasn't the valve

Edit: looks like it's 65 bucks on autozone.