Hello everyone!
2003 Grand Marquis LS Ultimate Edition 4.6L
Been getting P0420 code about 3 to 4 times a year, all in the summer time. I know what the code is, but don't know the cause. No other codes.
Got a scanner tool and it has live data. Now, this is what's strange about it. The scanner will read FP/Vac (psi) live, (fuel rail pressure relative to vacuum) and most days will hover around 39 psi steady, give or take 2 psi. Lately, when the wife takes the car to work, after she gets home, I'll wait 15 minutes and check FP/Vac (psi) live while hot, and it hovers at 58 psi. It's happened twice, when it's 90 degrees out, and the ECT is about 190 degrees.
20 psi difference :surprise:, and a high fuel pressure CAN cause a P0420 code. WTF?? Is this normal? Do I need a new FRP sensor?
Please help!
2003 Grand Marquis LS Ultimate Edition 4.6L
Been getting P0420 code about 3 to 4 times a year, all in the summer time. I know what the code is, but don't know the cause. No other codes.
Got a scanner tool and it has live data. Now, this is what's strange about it. The scanner will read FP/Vac (psi) live, (fuel rail pressure relative to vacuum) and most days will hover around 39 psi steady, give or take 2 psi. Lately, when the wife takes the car to work, after she gets home, I'll wait 15 minutes and check FP/Vac (psi) live while hot, and it hovers at 58 psi. It's happened twice, when it's 90 degrees out, and the ECT is about 190 degrees.
20 psi difference :surprise:, and a high fuel pressure CAN cause a P0420 code. WTF?? Is this normal? Do I need a new FRP sensor?
Please help!