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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 09-03-2013, 10:07 PM
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Kamanhart Kamanhart is offline
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Default are these related issues?

Installed my 185 degree thermostat tonight and finally got my rear 02 sensors hooked back up after header install and removed check engine lights and I get the code p0456 evap system leak I thought that was the gas gap but it didnt show up till thermostat install is there anyway they are related?
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Old 09-03-2013, 10:55 PM
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I'm not a fan of putting lower t-stats in engines due to the fact that their peak running temp is between 200 and 210 degrees (f). That being said, I don't think the 2 are related, because the evap system takes the excess fumes out of your tank and puts them back in to the engine. Could it be that because the engine isn't getting hot enough that the evap system isn't working correctly? I reckon it could be, but I don't see how. Maybe just some bad timing. Swap the t-stats and see if the issue goes away.
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Old 09-03-2013, 11:06 PM
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I see your point and agree with what your saying but the thing that makes me second guess that is I had cleared and checked all codes before the swap and it wasnt present just the o2 sensor codes then swapped tstat and plugged in o2 sensor extensions before initial start up and the code showed up on start up which wouldnt make sense to me why that the colder opening tstat would make the difference before even getting to "normal" operating temp
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Old 09-03-2013, 11:58 PM
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I run a 180 thermostat and never had any codes. Maybe a vacume hose got knocked loose.
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Old 09-04-2013, 12:04 AM
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Mike could be on to something. If a vac hose got pulled out, then the sensor would read too much build up because the fumes aren't getting sucked out. It's worth at least a look.
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Old 09-04-2013, 07:58 AM
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thank you guys i will take a look at that during lunch today, i do like the fact that it is running a little cooler though just makes me feel easier when its not riding around town at 208 degrees
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