Failed Emissions - Pirate4x4.Com : 4x4 and Off-Road Forum

d21 4x4 · 06-20-2005, 01:37 PM

Well, I took the D21 to emissions and everything went great, until the pressure test.

The tank holds pressure, but it doesn't release it. Someone said the replace the check valve near the fuel tank. Has anyone heard of this??

Any info on this would definitely help. Thanks, Tim

System-f · 06-20-2005, 01:55 PM

what year is your truck? OBDII systems have all kinds of doo-hickies for the EVAP system and I have had to replace most of them on my 98 pathfinder. I think all post OBDII systems just had the charcoal canister under the hood??

d21 4x4 · 06-20-2005, 02:40 PM

It's an 89 D21 4x4 V-6

System-f · 06-21-2005, 06:35 AM

it should have simple underhood EVAP equipment. It's very possible the charcoal canister is shot, one of the lines from the gas tank to the engine compartment is cracked or the filler hose is cracked?

jonx4x4 · 06-22-2005, 01:39 AM

Well, it would seem to me if it will hold pressure, but not release it, then it would be a plugged hose, or a plugged charcoal canister.

06-20-2005, 01:37 PM	#1 (permalink)
d21 4x4 Registered User Join Date: May 2005 Member # 47295 Location: Pheenix AZ Posts: 5	Failed Emissions PLEASE HELP Well, I took the D21 to emissions and everything went great, until the pressure test. The tank holds pressure, but it doesn't release it. Someone said the replace the check valve near the fuel tank. Has anyone heard of this?? Any info on this would definitely help. Thanks, Tim Last edited by d21 4x4; 06-20-2005 at 04:09 PM.

06-22-2005, 01:39 AM	#5 (permalink)
jonx4x4 Registered User Join Date: Jul 2004 Member # 32818 Location: BFE, OK Posts: 210	Well, it would seem to me if it will hold pressure, but not release it, then it would be a plugged hose, or a plugged charcoal canister. __________________ You can never have too much tire. You can have too much sheet metal and/or not enough drivetrain!

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06-20-2005, 01:55 PM	#2 (permalink)
System-f Registered User Join Date: Oct 2003 Member # 23900 Location: Texas Posts: 172	what year is your truck? OBDII systems have all kinds of doo-hickies for the EVAP system and I have had to replace most of them on my 98 pathfinder. I think all post OBDII systems just had the charcoal canister under the hood??

06-20-2005, 02:40 PM	#3 (permalink)
d21 4x4 Registered User Join Date: May 2005 Member # 47295 Location: Pheenix AZ Posts: 5	It's an 89 D21 4x4 V-6

06-21-2005, 06:35 AM	#4 (permalink)
System-f Registered User Join Date: Oct 2003 Member # 23900 Location: Texas Posts: 172	it should have simple underhood EVAP equipment. It's very possible the charcoal canister is shot, one of the lines from the gas tank to the engine compartment is cracked or the filler hose is cracked?