Check Engine after spark plugs change,help
Thread Starter
Joined: Nov 2007
Posts: 10
Likes: 0
RE: Check Engine after spark plugs change,help
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
Joined: Oct 2005
Posts: 2,019
Likes: 0
From: Honolulu
RE: Check Engine after spark plugs change,help
ORIGINAL: kinoman2002
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
ORIGINAL: Pharmboy
i wouldn't be surprised if it took a month
i wouldn't be surprised if it took a month
Veteran
Joined: Sep 2006
Posts: 308
Likes: 0
From:
RE: Check Engine after spark plugs change,help
ORIGINAL: GrApHite03
you'd get the same code.
Just like the code is definatly from the spark plugs... it won't take a month. The car checks at start-up as long as your car has more than 12% of gasoline and 39-89 degrees.The service manual posted on the first page shows exactly what trips the code and why. It's not rocket science, its just a vaccum leak.
ORIGINAL: kinoman2002
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
ORIGINAL: Pharmboy
i wouldn't be surprised if it took a month
i wouldn't be surprised if it took a month
Joined: Oct 2005
Posts: 2,019
Likes: 0
From: Honolulu
RE: Check Engine after spark plugs change,help
ORIGINAL: Pharmboy
shows how much know
ORIGINAL: GrApHite03
you'd get the same code.
Just like the code is definatly from the spark plugs... it won't take a month. The car checks at start-up as long as your car has more than 12% of gasoline and 39-89 degrees.The service manual posted on the first page shows exactly what trips the code and why. It's not rocket science, its just a vaccum leak.
ORIGINAL: kinoman2002
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
So far everything is OK but I don't believe reseting the computer fixed the problem, unless of course it was just the gas cap not tighten enough. I am curious when I can expect to get the "check engine" light if it is in fact the hose you mentioned above.
ORIGINAL: Pharmboy
i wouldn't be surprised if it took a month
i wouldn't be surprised if it took a month
Joined: Oct 2005
Posts: 2,019
Likes: 0
From: Honolulu
RE: Check Engine after spark plugs change,help
so now that i'm out of work and have some time to type... let me know where you think i'm wrong. I don't you have a true understanding of the issue at hand. If you need to expain the EVAP system and the NVLD, i'd be happy too.
Veteran
Joined: Sep 2006
Posts: 308
Likes: 0
From:
RE: Check Engine after spark plugs change,help
ORIGINAL: GrApHite03
Just like the code is definatly from the spark plugs... it won't take a month. The car checks at start-up as long as your car has more than 12% of gasoline and 39-89 degrees.The service manual posted on the first page shows exactly what trips the code and why. It's not rocket science, its just a vaccum leak[/b].
so now that i'm out of work and have some time to type... let me know where you think i'm wrong. I don't you have a true understanding of the issue at hand. If you need to expain the EVAP system and the NVLD, i'd be happy too.
Just like the code is definatly from the spark plugs... it won't take a month. The car checks at start-up as long as your car has more than 12% of gasoline and 39-89 degrees.The service manual posted on the first page shows exactly what trips the code and why. It's not rocket science, its just a vaccum leak[/b].
so now that i'm out of work and have some time to type... let me know where you think i'm wrong. I don't you have a true understanding of the issue at hand. If you need to expain the EVAP system and the NVLD, i'd be happy too.
I'm only helping this guy out, WTF is your problem.
Joined: Oct 2005
Posts: 2,019
Likes: 0
From: Honolulu
RE: Check Engine after spark plugs change,help
You can post all you want about barometric pressure and what not, but it has nothing to do with the EVAP and the NVLD system. The two work together to check leaks in the system to not allow gasoline vapors into the atmosphere. They check by purge and vacuum system... NVLD = Natural Vacuum Leak Detection
It's a very simple but effect system really... The NVLD seals the gas canister vent during engine off conditions. If the EVAP system has a leak of less than the failure threshold, the evaporative system will be pulled into a vacuum, either due to the cool down from operating temperature or ambient temperature changes. When the vacuum in the system exceeds about 19 H2O (0.25 KPA), a vacuum switch closes. The switch closure sends a signal to the computer. The computer uses the switch signal, or lack thereof, to make a determination of whether a leak is present. FYI, it can actually detect a leak as small as .020".
There is actually another cool part of the system that acts like a blow off valve for positive pressure situations. Mostly used to permit the venting of gasoline vapors during refueling. I'll skip over the charcoal canister used to "clean" the vapors before they are rerouted into the intake manifold.
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F)
Set Condition: The PCM does not see the NVLD switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. Two Trip Fault.
BTW, help was provided rigt after you told the OP that the code was from his spark plugs...
It's a very simple but effect system really... The NVLD seals the gas canister vent during engine off conditions. If the EVAP system has a leak of less than the failure threshold, the evaporative system will be pulled into a vacuum, either due to the cool down from operating temperature or ambient temperature changes. When the vacuum in the system exceeds about 19 H2O (0.25 KPA), a vacuum switch closes. The switch closure sends a signal to the computer. The computer uses the switch signal, or lack thereof, to make a determination of whether a leak is present. FYI, it can actually detect a leak as small as .020".
There is actually another cool part of the system that acts like a blow off valve for positive pressure situations. Mostly used to permit the venting of gasoline vapors during refueling. I'll skip over the charcoal canister used to "clean" the vapors before they are rerouted into the intake manifold.
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F)
Set Condition: The PCM does not see the NVLD switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. Two Trip Fault.
BTW, help was provided rigt after you told the OP that the code was from his spark plugs...
Veteran
Joined: Sep 2006
Posts: 308
Likes: 0
From:
RE: Check Engine after spark plugs change,help
ORIGINAL: GrApHite03
You can post all you want about barometric pressure and what not, but it has nothing to do with the EVAP and the NVLD system. The two work together to check leaks in the system to not allow gasoline vapors into the atmosphere. They check by purge and vacuum system... NVLD = Natural Vacuum Leak Detection
It's a very simple but effect system really... The NVLD seals the gas canister vent during engine off conditions. If the EVAP system has a leak of less than the failure threshold, the evaporative system will be pulled into a vacuum, either due to the cool down from operating temperature or ambient temperature changes. When the vacuum in the system exceeds about 19 H2O (0.25 KPA), a vacuum switch closes. The switch closure sends a signal to the computer. The computer uses the switch signal, or lack thereof, to make a determination of whether a leak is present. FYI, it can actually detect a leak as small as .020".
There is actually another cool part of the system that acts like a blow off valve for positive pressure situations. Mostly used to permit the venting of gasoline vapors during refueling. I'll skip over the charcoal canister used to "clean" the vapors before they are rerouted into the intake manifold.
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F)
Set Condition: The PCM does not see the NVLD switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. Two Trip Fault.
BTW, help was provided rigt after you told the OP that the code was from his spark plugs...
You can post all you want about barometric pressure and what not, but it has nothing to do with the EVAP and the NVLD system. The two work together to check leaks in the system to not allow gasoline vapors into the atmosphere. They check by purge and vacuum system... NVLD = Natural Vacuum Leak Detection
It's a very simple but effect system really... The NVLD seals the gas canister vent during engine off conditions. If the EVAP system has a leak of less than the failure threshold, the evaporative system will be pulled into a vacuum, either due to the cool down from operating temperature or ambient temperature changes. When the vacuum in the system exceeds about 19 H2O (0.25 KPA), a vacuum switch closes. The switch closure sends a signal to the computer. The computer uses the switch signal, or lack thereof, to make a determination of whether a leak is present. FYI, it can actually detect a leak as small as .020".
There is actually another cool part of the system that acts like a blow off valve for positive pressure situations. Mostly used to permit the venting of gasoline vapors during refueling. I'll skip over the charcoal canister used to "clean" the vapors before they are rerouted into the intake manifold.
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F)
Set Condition: The PCM does not see the NVLD switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. Two Trip Fault.
BTW, help was provided rigt after you told the OP that the code was from his spark plugs...
Also, no where in that rantdid you say anything that was remotely relevant to what I posted, I'm glad you can copy and paste out of the sm, but you really must not know anything if that's all you can do. [&:]
Joined: Oct 2005
Posts: 2,019
Likes: 0
From: Honolulu
RE: Check Engine after spark plugs change,help
yes i can copy and paste, but the most important part is that i can read it and comprehend what is going on. If you want a copy let me know.
What did i not touch on? Do want me to say your part right about vacuum since the fault code can be caused by a faulty switch? Well there it is... you happy. The system is meant to test for leaks... it does so by creating a vacuum in the canister.
Another part of your post, you say just like any dodge, well that is not true... This system is new to the NGC controller and is only in vehicles from 2003 an up. I already told you barometric pressure has noting to do with it. Temperature does, which you stated, but only atmospheric not engine. What else did i miss? don't matter, I'm done with arguing with you... That is how the system works and that is that.
we don't need to get into it since the OP only needs to know that there is a leak. Tell me how that leak is tested again?
25 foot breaks on the North Shore today, i'm outa here.
What did i not touch on? Do want me to say your part right about vacuum since the fault code can be caused by a faulty switch? Well there it is... you happy. The system is meant to test for leaks... it does so by creating a vacuum in the canister.
Another part of your post, you say just like any dodge, well that is not true... This system is new to the NGC controller and is only in vehicles from 2003 an up. I already told you barometric pressure has noting to do with it. Temperature does, which you stated, but only atmospheric not engine. What else did i miss? don't matter, I'm done with arguing with you... That is how the system works and that is that.
we don't need to get into it since the OP only needs to know that there is a leak. Tell me how that leak is tested again?
25 foot breaks on the North Shore today, i'm outa here.