mpsjr
Well-Known Member
Sorry it's so long, but this post requires a backstory...
A few months ago my fuel pump died, so I had a local shop replace it. A few weeks before, I'd had the same shop clear an O2 sensor code before we went on a long trip. My truck had been parked for several years before I bought it, so the O2 sensor issue wasn't a surprise.
When I picked my truck up after getting the new pump installed, my Service Engine Soon light was on. I figured it was the same O2 sensor issue that it had before the fuel pump went out so I didn't pay attention to it at the time. I eventually got it scanned at Autozone and they said it was DTC P0452 (before, it was an O2 sensor problem).
I also noticed a hesitation problem with my truck after getting the new pump installed. It never had the problem before, and at first, I thought it was just air trapped in the line from having the new pump and filter installed. However, the problem never corrected itself, so this past weekend, I decided to put in another pump since the other one was still under warranty. After getting everything back together on Saturday, the DTC light was gone (THRILLED) as was the hesitation/stalling problem. However, on my way home yesterday, the light came on for the same P0452 issue.
My question is whether anyone knows what could be causing the issue. I know the code says low voltage, which could mean any number of things, but being that the voltage is low, I'm figuring it is probably a plugged solenoid or canister vent. Does this sound about right? I have checked the hoses and connections and everything seems fine, and yes, my gas cap is on. I do (sometimes) get a hissing sound when I pull the gas cap off after driving, which I know can mean the vent is blocked, but how would I go about fixing the problem. Any help would be greatly appreciated.
Thanks,
Matt
1999 Expedition EB 4x2 5.4
A few months ago my fuel pump died, so I had a local shop replace it. A few weeks before, I'd had the same shop clear an O2 sensor code before we went on a long trip. My truck had been parked for several years before I bought it, so the O2 sensor issue wasn't a surprise.
When I picked my truck up after getting the new pump installed, my Service Engine Soon light was on. I figured it was the same O2 sensor issue that it had before the fuel pump went out so I didn't pay attention to it at the time. I eventually got it scanned at Autozone and they said it was DTC P0452 (before, it was an O2 sensor problem).
I also noticed a hesitation problem with my truck after getting the new pump installed. It never had the problem before, and at first, I thought it was just air trapped in the line from having the new pump and filter installed. However, the problem never corrected itself, so this past weekend, I decided to put in another pump since the other one was still under warranty. After getting everything back together on Saturday, the DTC light was gone (THRILLED) as was the hesitation/stalling problem. However, on my way home yesterday, the light came on for the same P0452 issue.
My question is whether anyone knows what could be causing the issue. I know the code says low voltage, which could mean any number of things, but being that the voltage is low, I'm figuring it is probably a plugged solenoid or canister vent. Does this sound about right? I have checked the hoses and connections and everything seems fine, and yes, my gas cap is on. I do (sometimes) get a hissing sound when I pull the gas cap off after driving, which I know can mean the vent is blocked, but how would I go about fixing the problem. Any help would be greatly appreciated.
Thanks,
Matt
1999 Expedition EB 4x2 5.4
