Failed EVAP smog test
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Failed EVAP smog test
Hello;
I am new to the forum; thanks for having me. I've just purchase a 1991 ranger 4.0 5 spd 4 wd. The tech started with the EVAP test, which failed miserably. He didn't charge me for the test, but, did not completee the test either. He said there was a 99% chance it was a cracked fuel filler hose. I contacted the gentleman I bought the truck from, he said he replaced that three years ago. I pulled off the bed today and sure enough the hose was good and the clamps were tight. However, where I expected to find one vapor line from the vapor valve, I found two. One ran to the charcoal cannister and the other was missing, Or maybe the plug was missing. Every image I can find of these show only one hose from the valve. Can someone help me?
I am new to the forum; thanks for having me. I've just purchase a 1991 ranger 4.0 5 spd 4 wd. The tech started with the EVAP test, which failed miserably. He didn't charge me for the test, but, did not completee the test either. He said there was a 99% chance it was a cracked fuel filler hose. I contacted the gentleman I bought the truck from, he said he replaced that three years ago. I pulled off the bed today and sure enough the hose was good and the clamps were tight. However, where I expected to find one vapor line from the vapor valve, I found two. One ran to the charcoal cannister and the other was missing, Or maybe the plug was missing. Every image I can find of these show only one hose from the valve. Can someone help me?
Hotshot
Joined: Apr 2010
Posts: 19,072
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From: Saratoga Springs,UT
My car Poped a P0442 today
EVAP Small Leak Detected
I hoping mine was Loose fuel Cap fingers crossed
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However IDK if your is Like this or I am confussed exactly where you mean
But How I see it from the Purge Valve/silinoid one Line goes to the Charcoal canister and the Other Line Goes to the Throttle Body/Intake
Do you know the exact DTC thrown??
Should it have one??? Mines Newer than 1996 so OBDII and its got a few diffrent ones for that EVAP System
IDK Good Luck and am Curious to what you find out
EVAP Small Leak Detected
I hoping mine was Loose fuel Cap fingers crossed
-------------------------------------------------------------------------------------
However IDK if your is Like this or I am confussed exactly where you mean
But How I see it from the Purge Valve/silinoid one Line goes to the Charcoal canister and the Other Line Goes to the Throttle Body/Intake
Do you know the exact DTC thrown??
Should it have one??? Mines Newer than 1996 so OBDII and its got a few diffrent ones for that EVAP System
IDK Good Luck and am Curious to what you find out
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I think I'm going to just plug the hose. I believe this is what caused my EVAP test to fail. However, I wonder if capping it will cause me to fail another part of the test later? I don't know of any other system in the truck that'll include fuel tank in the vacuum/vent system.
Thank you for your help.
Thank you for your help.
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
Oh I see where its at
I was Lost I thought you were in the engine bay area
My only thought is EVAP will let air In but Not out so could that be an air Inlet??
I suppose you could cap it and drive for a Few then remove the Gas Cap and see if there is really High Vac Press
If the Short Hose is a Vent Line then that might mean the Valve there at the tank is Bad IDK just a Thought
I was Lost I thought you were in the engine bay area
My only thought is EVAP will let air In but Not out so could that be an air Inlet??
I suppose you could cap it and drive for a Few then remove the Gas Cap and see if there is really High Vac Press
If the Short Hose is a Vent Line then that might mean the Valve there at the tank is Bad IDK just a Thought
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
What about the Fuel Cap??
Is it possible there is a Vent Built into that???
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I put a little air pressure into the tank via the evap hose @ the charcoal cannister. The valve made a "farting" noise, as the air escaped from that "extra" hose. The valve does not operate the other way, it is single action, so, when there is pressure in the tank or a vacuum applied at the charcoal cannister the valve opens. The vacuum is simultaneous at both hoses. It is my understanding the fuel cap provide air to the tank to prevent deformation of the tank as the vapors inside cool and condense. The tech did not check the fuel cap, he checked the evap by connecting his equipment to the filler tube.
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