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Old 12-05-2007, 07:41 PM   #461
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2kleendodge.

You need to check for diagnostic trouble codes if the CEL is coming on. Any of the bigger auto parts stores can check for codes for free. In my opinion the dealership should check for codes for free too.

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Old 12-05-2007, 08:38 PM   #462
 
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i had them check the codes and they replaced some little pump.. i dont remember the name of it but the noise sounds like a pinched or severed exhaust manifold gasket and i am woundering if it does have an exhaust leak, if this could cause that part to keep going bad... the part that keeps going bad it the esim/nvld, evaporative syst....
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Old 12-05-2007, 09:07 PM   #463
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The NVLD (Natural Vacuum Leak Detection) pump is part of the EVAP system.
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Question:
I have a 2003 Dodge Ram 1500. I have a check engine light with DTC codes P0442 and P0455. What exactly causes these Dodge engine light codes, and how do I fix the problem? What needs to be replaced? I have already replaced the gas cap and this did not fix the problem as the check engine light is still on.

Answer:
I think I can be of assistance. A Dodge engine light code P0442 indicates that a medium sized leak has been detected in the evaporative emissions system. Code P0455 indicates that a large leak has been detected. So basically the same concern is likely causing both check engine light codes. The evaporative emissions system is responsible for controlling fuel vapors, and metering them into the engine to be used in combustion and reduce overall vehicle emissions. The computer actually has a test that it performs on this system under certain conditions to make sure that there are no leaks, which would allow these vapors to vent to the air and pollute the environment. These conditions include cold start, engine running with fuel level greater than 12% and outside temperatures between 39 and 89 degrees Fahrenheit. When performing this test, the computer activates a Purge Solenoid to bring the system under vacuum. Once the NVLD (Natural Vacuum Leak Detection) switch is closed, indicating that a vacuum is obtained, the solenoid is turned off. If the vacuum level drops off, indicating that there is a leak in the system, the computer will set these codes. The rate of the leak determines which codes will be set. If you have replaced the gas cap then you can most likely eliminate that as the leak point. I would suggest taking a close look at the filler neck to make sure there are no cracks, and that there is a smooth surface for the gas cap gasket to seal against. A repair shop will hook a specialized smoke machine up to the evaporative emissions system and close the evap solenoid vent line. They will then fill the system with smoke and check with a spotlight for leaks. If no leaks are found it is possible that there is an issue with the purge solenoid. You can perform a quick mechanical leak check on this solenoid by disconnecting the vacuum lines from it and applying a 10 in Hg vacuum to the "can" side of the solenoid. It should hold vacuum. If not there may be an internal concern. Most often a leak in one of the lines or fittings is the cause of the problem and repair is fairly quick and inexpensive. You can do a visual on the lines yourself before bringing it to a shop. The EVAP leak detection pump, filter and purge solenoid can all be found together at the passenger's side front fender.** The filter is the cylinder type device and the purge solenoid has the double vacuum fitting and electrical connector going to it. The pump should have a vacuum line on top and a couple of larger EVAP lines towards the front side as well. Check all lines at these components and follow them to their destinations, looking for signs ot wetness, leaks or cracks. Repair as needed. Use standard safety procedures and equipment. I hope you have found this information helpful. Let me know if I can be of any further assistance! If you've enjoyed our site and found it useful, consider referring a friend. Thanks for visiting!
Mike
www.engine-light-help.com
** That is incorrect! They are located in front of the gas tank on the driver side mounted to the frame.
http://www.engine-light-help.com/dod...ine-light.html
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Old 12-05-2007, 09:25 PM   #464
 
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you have been a help for sure...... but i still dont know what the whooshing diesel sound is , you can only hear it with the windows down and when you drive by other cars and walls or concrete barriers...... and you have to be in the gas to hear it, and i does not do it when the truck is cold...
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Old 12-06-2007, 03:13 AM   #465
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Welcome to HTC.com 2kleendodge - and congrats on your new Hemi Ram! I would go to the dealer and have the service tech ride with you - so that you both can hear the noise. Keep on them to fix the problem!
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Old 12-06-2007, 03:22 AM   #466
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Old 12-06-2007, 05:30 AM   #467
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Welcome <span class="ev_code_RED">2kleendodge</span>, glad to have ya join us. Sorry your having problems. I'm fighting with a dealership too over a noise they say is exhaust turbulence, I say it's the rear end.

Goog job Dave!
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Old 12-06-2007, 05:48 AM   #468
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I say it's the rear end.
and if anyone knows rear ends ........
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Old 12-06-2007, 05:59 AM   #469
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Old 12-06-2007, 06:59 AM   #470
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