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2002 Dodge Caravan P0455 gross evap leak.... #656372 03/30/10 08:56 PM 03/30/10 08:56 PM
Joined: Jan 2003 Posts: 9,887 USA CrAlt OP master
CrAlt OP master Joined: Jan 2003 Posts: 9,887 USA	Ive replaced the cap. Ive looked at all the vac lines I can see and all the lines going to and from the charcoal canister. How does the computer know there is a vacuum leak? Can I just plug the line to some sensor? My mother has been driving with the check engine light on for 2 years. Now the registration is up and they wont renew it with it on. I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: CrAlt] #656373 03/30/10 10:08 PM 03/30/10 10:08 PM
Joined: Jul 2004 Posts: 3,804 Arlington, Texas B bobby66 master
bobby66 master B Joined: Jul 2004 Posts: 3,804 Arlington, Texas	You can get a smoke check done at the dealer to find the source of the leak. Might be cheaper to just replace all the rubber hoses that might potentially leak. Couple go to the gas tank on my truck so dont forget to crawl under and replace those.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: CrAlt] #656374 03/30/10 10:09 PM 03/30/10 10:09 PM
Joined: Mar 2003 Posts: 1,728 ST clair shores MI M moretoys top fuel
moretoys top fuel M Joined: Mar 2003 Posts: 1,728 ST clair shores MI	The computer can tell because it can tell when The system is put into a vacuum test.If it doesn't hold.then it will set a light.(code # is based on it's time it lost pressure.look at the hoses better.I have seen many with a cracked hose near the green test port,near the radiator.The system is Not always under vacuum.The only way to find a leak after the physical looking of the system, is a smoke machine.pressurize the system with smoke and look for leaks.The equipment for this is about $1000 on the low end.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: bobby66] #656375 03/30/10 10:13 PM 03/30/10 10:13 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	like he said, the tool used for this injects smoke into the system to visually check for leaks. DO NOT apply high pressure to the system! The way the computer knows is to induce a vacuum into the system and hold it, watching for decay (leak). This is not a simple DIY diagnose and repair. If you have good skills and the vacuum diagram, you can spend a full day checking each component and hose.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: RodStRace] #656376 03/30/10 10:33 PM 03/30/10 10:33 PM
Joined: Jan 2003 Posts: 9,887 USA CrAlt OP master
CrAlt OP master Joined: Jan 2003 Posts: 9,887 USA	Quote: The way the computer knows is to induce a vacuum into the system and hold it, watching for decay (leak). So how does it "watch" this? Can I just plumb this sensor to an old vacuum canister or something? This thing is on its last leg.. I don't really care about fixing it. I just need the light to stay off It also has trans issues, a window that is duct taped up, and body parts that fall off at random times Im not going to spend $1000 for a tool to fix a $100 van. I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: CrAlt] #656377 03/30/10 11:09 PM 03/30/10 11:09 PM
Joined: Jan 2003 Posts: 9,887 USA CrAlt OP master
CrAlt OP master Joined: Jan 2003 Posts: 9,887 USA	Good ol' internet 5897857-Picture23.png (22988 downloads) I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: CrAlt] #656378 03/31/10 01:47 AM 03/31/10 01:47 AM
Joined: Jan 2007 Posts: 10,130 A Red State SNK-EYZ I Live Here
SNK-EYZ I Live Here Joined: Jan 2007 Posts: 10,130 A Red State	The LDP pump should be in the engine compartment. The lines are plastic with o-ring snap together connections. If the van has been wrecked at some time the lines or the plastic nipples on the LDP pump could be cracked or broken. Sometime simply disconnecting the snap connections and reconnecting them will cure the problem. I've seen in fix it alot of times in the assembly plant. Kayse can't keep up at all now. lol

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: SNK-EYZ] #656379 03/31/10 08:30 AM 03/31/10 08:30 AM
Joined: Jan 2003 Posts: 9,887 USA CrAlt OP master
CrAlt OP master Joined: Jan 2003 Posts: 9,887 USA	Thanks. Ya this van has been hit and hit things. Its been high centered on snow banks and stuck in mudd up to the rocker panels. When�err.. IF it ever stops raining im going see if I can find the leak.. At least now I have some idea of how the system works. I can plug the line going to the tank and divide and conquer now. I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: CrAlt] #656380 03/31/10 08:34 AM 03/31/10 08:34 AM
Joined: Jun 2003 Posts: 21,403 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,403 It's a dry heat	the NVLD pulls a vacuum on the system overnight and watches for state of change ( aka loss of vacuum)) to ck for small leaks ck ALL the hoses closely most common ones are at the purge solenoid @ pass side of the radiator support ck the hoses at the main body line to throttle body ( both ends) @ pass side engine compartment under the air cleaner hose ck both the vapor line and vacuum line at the NVLD ( natural vacuum leak detection) pump . @ inside on the drivers side frame rail just rearward of the front suspension cradle if all is good chances are you need one or the other either the NVLD( most likely with this fault) or the purge solenoid. IF your 100% sure all hoses are good, you might get away with just clearing the fault and immediately taking the car to get ck'd and tags.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: gtx6970] #656381 03/31/10 08:41 AM 03/31/10 08:41 AM
Joined: Jan 2003 Posts: 9,887 USA CrAlt OP master
CrAlt OP master Joined: Jan 2003 Posts: 9,887 USA	Quote: immediately taking the car to get ck'd and tags. No go. They plug in a scan tool and see it hasnt hit the drive cycles. Thanks for the info. I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: 2002 Dodge Caravan P0445 gross evap leak.... [Re: gtx6970] #656382 03/31/10 09:04 AM 03/31/10 09:04 AM
Joined: Feb 2010 Posts: 1,377 Ohio Todd pro stock
Todd pro stock Joined: Feb 2010 Posts: 1,377 Ohio	Quote: the NVLD pulls a vacuum on the system overnight and watches for state of change ( aka loss of vacuum)) to ck for small leaks ck ALL the hoses closely most common ones are at the purge solenoid @ pass side of the radiator support ck the hoses at the main body line to throttle body ( both ends) @ pass side engine compartment under the air cleaner hose ck both the vapor line and vacuum line at the NVLD ( natural vacuum leak detection) pump . @ inside on the drivers side frame rail just rearward of the front suspension cradle if all is good chances are you need one or the other either the NVLD( most likely with this fault) or the purge solenoid. IF your 100% sure all hoses are good, you might get away with just clearing the fault and immediately taking the car to get ck'd and tags. I would still have them test the system with the EELD machine to find the leak. Ive seen alot of the fuel filler necks rusted out on those older RS vans. Wouldnt know until it gets some smoke

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