won't pass smog, error code P1450

merc · 07-31-2004, 03:00 PM

any ideas? my regist. is past due (dmv never sent notice), and i need smog, but it failed due to check engine light and error code P1450. i looked up the code, and learned it was "Inability of Evaporative Emission Control System to Bleed Fuel Tank." great. i have no idea what that means or what i need to do to fix it. anyone have any ideas? Ford dealer wants $95.00 to diagnose, plus however much to fix it (i am out of ajob as of the end of next week, so i'm trying to do this on my own). i have a '97 merc mountaineer w/93k miles, and i'm desperate.

*huskyfan23* · 07-31-2004, 03:15 PM

This thread may help.

http://www.explorerforum.com/forums/...ht=evaporative

merc · 07-31-2004, 03:25 PM

thanks husky, i had checked there earlier, and just now revisited, but i'm still lost. i need specific info (i guess) for p1450. i found another thread that had one very specific description of how the diagnostic is poerformed by the cars computer. this only confused me more. i am hoping someone can tell me what things to try, and in what order, to diagnose what my problem is. i am new to the site, so sorry if i am going about this all wrong.

merc · 07-31-2004, 03:31 PM

still trying...

*Brain* · 07-31-2004, 04:27 PM

The code means that there is too much vacuum in the gas tank. Cheapest possible fix is replacing the gas cap. Try this first. Be sure to clear the fault code from memory after you change anything so that you are not reading a stored fault code that is no longer a problem.

merc · 07-31-2004, 04:31 PM

thanks brain. i'll try that right now. will disconnecting battery for a few minutes clear the code??

*huskyfan23* · 07-31-2004, 04:41 PM

Quote:

Originally Posted by merc

thanks brain. i'll try that right now. will disconnecting battery for a few minutes clear the code??

Yeah, disconnect the negative for 15-30 minutes.

*Brain* · 07-31-2004, 05:08 PM

I'm not sure, but my Fords (92-94) use EEC-IV ststem and code reader, and there is a way to erase the contiuous fault codes by switching the code reader to HOLD while it is starting to read the KOEO codes...I don't know if this has changed (it might be a time saver).

merc · 07-31-2004, 06:16 PM

thanks for the tips guys. i've slathered some pet. jelly on the gas cap gasket, and i reset the computer (i think, it certainly cleared the radio), so i'll see if the CEL comes on again. if it does, could it be the o2 sensors? i was told there are 4 of them. brain, i don't have a code reader, but thanks. i'll post again after i do some driving.

SiLenZe · 07-31-2004, 06:37 PM

problem:
P1450 - Unable to Bleed Up Fuel Tank Vacuum
Monitors the fuel vapor vacuum and pressure in the fuel tank. The system failure occurs when the EVAP running loss monitor detects excessive fuel tank vacuum with the engine running (but not at idle).

things to look for:
Blockages or kinks in EVAP canister tube or EVAP canister purge outlet tube (between fuel tank, EVAP canister purge valve and EVAP canister)
Fuel filler cap stuck closed (no vacuum relief)
Contaminated fuel vapor elbow on EVAP canister
Restricted EVAP canister
CV solenoid stuck open (partially or fully)
Plugged CV solenoid filter
EVAP canister purge valve stuck open
VREF circuit open (harness near FTP sensor, FTP sensor or PCM)
Damaged FTP sensor

07-31-2004, 03:00 PM	#1
merc Wannabe Elite Explorer orange, ca 97 mountaineer Join Date: Jul 2004 Posts: 5 Vehicle Specs (Original Poster)	i'm still lost, error code P1450 any ideas? my regist. is past due (dmv never sent notice), and i need smog, but it failed due to check engine light and error code P1450. i looked up the code, and learned it was "Inability of Evaporative Emission Control System to Bleed Fuel Tank." great. i have no idea what that means or what i need to do to fix it. anyone have any ideas? Ford dealer wants $95.00 to diagnose, plus however much to fix it (i am out of ajob as of the end of next week, so i'm trying to do this on my own). i have a '97 merc mountaineer w/93k miles, and i'm desperate. Last edited by merc; 07-31-2004 at 04:29 PM.

07-31-2004, 03:15 PM	#2
huskyfan23 Rah no Hans Bwix WA 1994 XLT 4x4 Join Date: Nov 2002 Posts: 6,896 Vehicle Specs	This thread may help. http://www.explorerforum.com/forums/...ht=evaporative __________________ 1994 Explorer XLT My registry entry: here Diamond Everything w/ HID Bi-Xenon Projectors I'm no doctor, but I am a self-proclaimed genius. There's no reason not to trust me. What kind of dessert causes women to gain the most weight? Wedding cake

07-31-2004, 03:25 PM	#3
merc Wannabe Elite Explorer orange, ca 97 mountaineer Join Date: Jul 2004 Posts: 5 Vehicle Specs (Original Poster)	still confused! thanks husky, i had checked there earlier, and just now revisited, but i'm still lost. i need specific info (i guess) for p1450. i found another thread that had one very specific description of how the diagnostic is poerformed by the cars computer. this only confused me more. i am hoping someone can tell me what things to try, and in what order, to diagnose what my problem is. i am new to the site, so sorry if i am going about this all wrong.

07-31-2004, 03:31 PM	#4
merc Wannabe Elite Explorer orange, ca 97 mountaineer Join Date: Jul 2004 Posts: 5 Vehicle Specs (Original Poster)	still trying... Last edited by merc; 07-31-2004 at 04:32 PM.

07-31-2004, 06:37 PM	#10
SiLenZe Wannabe Elite Explorer Milwaukee, WI '01 Sport Join Date: Feb 2003 Posts: 805 Vehicle Specs	problem: P1450 - Unable to Bleed Up Fuel Tank Vacuum Monitors the fuel vapor vacuum and pressure in the fuel tank. The system failure occurs when the EVAP running loss monitor detects excessive fuel tank vacuum with the engine running (but not at idle). things to look for: Blockages or kinks in EVAP canister tube or EVAP canister purge outlet tube (between fuel tank, EVAP canister purge valve and EVAP canister) Fuel filler cap stuck closed (no vacuum relief) Contaminated fuel vapor elbow on EVAP canister Restricted EVAP canister CV solenoid stuck open (partially or fully) Plugged CV solenoid filter EVAP canister purge valve stuck open VREF circuit open (harness near FTP sensor, FTP sensor or PCM) Damaged FTP sensor __________________ -SiLenZe http://www.geocities.com/silenze99/

07-31-2004, 04:27 PM	#5
Brain Elite Explorer Golden, CO '92 4X EB and '91 4X XLT Join Date: Jun 2004 Posts: 915 Vehicle Specs	The code means that there is too much vacuum in the gas tank. Cheapest possible fix is replacing the gas cap. Try this first. Be sure to clear the fault code from memory after you change anything so that you are not reading a stored fault code that is no longer a problem.

07-31-2004, 04:31 PM	#6
merc Wannabe Elite Explorer orange, ca 97 mountaineer Join Date: Jul 2004 Posts: 5 Vehicle Specs (Original Poster)	thanks brain. i'll try that right now. will disconnecting battery for a few minutes clear the code??

07-31-2004, 05:08 PM	#8
Brain Elite Explorer Golden, CO '92 4X EB and '91 4X XLT Join Date: Jun 2004 Posts: 915 Vehicle Specs	I'm not sure, but my Fords (92-94) use EEC-IV ststem and code reader, and there is a way to erase the contiuous fault codes by switching the code reader to HOLD while it is starting to read the KOEO codes...I don't know if this has changed (it might be a time saver).

07-31-2004, 06:16 PM	#9
merc Wannabe Elite Explorer orange, ca 97 mountaineer Join Date: Jul 2004 Posts: 5 Vehicle Specs (Original Poster)	thanks for the tips guys. i've slathered some pet. jelly on the gas cap gasket, and i reset the computer (i think, it certainly cleared the radio), so i'll see if the CEL comes on again. if it does, could it be the o2 sensors? i was told there are 4 of them. brain, i don't have a code reader, but thanks. i'll post again after i do some driving.