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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 02-09-2013, 08:50 PM
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Default Whats the problem?

So I recently had an EGR Valve code come up so I bought a new EGR Valve and replaced the old one. But now I seem to be getting way worse MPG than I was with the old EGR Valve in. Also, though nothing looks different when I rev the engine the exhaust smells much more rich than it did before the EGR Valve switch (only if you are on the outside of the truck, from the inside you dont smell it) Does anyone know what the problem could be? The truck is running fine other than the decrease in MPG and the smell of the exhaust. My driving habits havent changed so I really dont know what it could be.
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Old 02-09-2013, 09:12 PM
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What code number did you get?
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Old 02-09-2013, 09:15 PM
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P0404 ITs one Ive gotten before and had to change an EGR Valve back in July. I didnt think the code would come up again but I was wrong so I just went and got a new EGR Valve since its a relatively cheap fix ($40)
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Old 02-09-2013, 11:41 PM
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Did you disconnect the battery after swapping the valve to clear the memory? Might be worth a shot. Also try disconnecting the plug from the sensor and drive it. You will get a cel, but it wont hurt anything, and see if that helps. If it does you probably have a bad EVP sensor, which I think is integral to the valve on your truck. If so, go back where you got the valve and exchange it for another. Is it mopar or parts store brand?
Also, make sure wiring is in good shape going to sensor.
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Last edited by RAM EM; 02-09-2013 at 11:44 PM.
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Old 02-10-2013, 12:54 AM
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I have a Predator tuner and used that to clear the code. From what I can tell the wiring is in good shape with no problems. I really hope its not a bad sensor on the new part, since last time I replaced the EGR valve I had problems with the new part as well.

Would maybe doing a system cleaning fix things? Such as a seafoam treatment or something like that?
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Old 02-10-2013, 01:59 AM
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Clearing the code won't clear PCM's memory. Since you have a tuner, reload the tune. Seafoam treatment won't hurt, but I doubt it will "fix" anything.
Disconnect the plug and see what happens as far as gas mileage/smell. You'll basically be bypassing the EGR system by doing this. You can clear any resulting trouble codes.
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Last edited by RAM EM; 02-10-2013 at 02:04 AM.
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Old 02-10-2013, 11:02 AM
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Ill disconnect the battery today (hopefully) and let you know if I see any improvements
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