Code p0455
New User
Joined: Jun 2004
Posts: 3
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From: Hawaii
Hi,
I am new to this board and really appreciate all of the informative info-just great! I picked up a code scanner yesterday and ran the same PO455 code on my 99 Explorer 4X4 4.0L . I am also unable to locate the Evap Emmission Control on my vehicle- Please assist with helping me locate this item. Much thanks.
I am new to this board and really appreciate all of the informative info-just great! I picked up a code scanner yesterday and ran the same PO455 code on my 99 Explorer 4X4 4.0L . I am also unable to locate the Evap Emmission Control on my vehicle- Please assist with helping me locate this item. Much thanks.
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Junior User
Joined: Mar 2003
Posts: 74
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From: On the Alabama River
The evap emission control is just a 2 dollar word for fuel tank fume control. The fuel tank pressure is monitored by the engine computer via a pressure sensor on the tank. It is held at a slight vacuum. Now I have simplified this to an extreme. There is a lot of other stuff involved, solenoid valve, fuel vent canister, enough hose to go back and forth down the truck a few times. The code is supposed to be telling you that you have a severe leak in one or more components of this system. The gas cap being loose is a usual culprit. In my case the dealer couldn't find anything and niether have I. I re-checked everything I could and even bought a new gas cap. The last thing I tried was to put a small amount of grease on the rubber inside the gas cap. The code has not come back in almost a week. BTW - this is a pain for the stealership as well. They even have a smoke machine to try and find leaks. The computer has to run it's diagnostic on the evap system twice with a failure before it will post the code.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
Originally Posted by satkins1044
They even have a smoke machine to try and find leaks. The computer has to run it's diagnostic on the evap system twice with a failure before it will post the code.
I'm surprised the smoke test didn't find the leak, inasmuch as the code you mention is supposedly a "major leak" opposed to a code p0442 which is a "small leak."
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Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
Ive seen this happen too, when someone has replaced the fuel pump or sending unit, and failed to get the seal back on properly or reused the old seal and it had swelled up and would no longer fit properly.
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New User
Joined: Jun 2004
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Is this relevant?
I have seen this problem before, just on a different vehicle. I have a question to see if you are doing this and to see if it is relevant. Do you keep clicking the fuel pump nozzle after you fill the tank, or do you quit after the first "click-off?" It seems that the tank needs the extra room for expansion(or whatever it measures). I was informed at the dealership, that if you do this, it will fill the overflow tank, meant for fumes (a charcoal filter unit, coffe can sized, under the hood), and I was wondering if this would cause your problem.
This may be two seperate issues, I was just wondering for my own information. Anyone else heard of not "multi-cliclking" the fuel pump?
This may be two seperate issues, I was just wondering for my own information. Anyone else heard of not "multi-cliclking" the fuel pump?
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