Exhaust hot on one side of engine - Hemi Truck Club
 
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Old 02-07-2017, 10:21 PM   #1
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Exhaust hot on one side of engine

Anyone ever hear of this problem or better yet, what causes it? 2004 2500 Hemi--passenger side exhaust gets 3x as hot as driver's side. I first noticed it several months back when I had a bad 02 sensor that ruined a cat. After replacing all the 02 sensors is when I first noticed it. Removed both cats but it still gets hot. I think it has continuously gotten so hot that it has ruined my front shock on that side and is ruining my transmission as well. Transmission goes into "limp" mode when running around town or after idling in front of a store for a while. As long as you are out on the open road where the wind blows the heat away it does fine. Have put all kinds of code readers on it and just get the codes that pop up because there are no cats. I am thinking maybe part of burnt up cat got in the muffler and is still restricting? (Best I can remember, the muffler has two inlets and one outlet). I am thinking about dualing it out with some glasspacks or those fancy new turbo mufflers but if that doesn't fix it and the transmission still goes into limp mode, starting off in 3rd gear will be kind of comical!!! Anyone seen this before? Oh, today a guy started it up and put a pyrometer to the exhaust pipes after a few minutes...driver's side 92 degrees and passenger side 292 degrees!!!???

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Old 02-08-2017, 12:11 AM   #2
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Be careful the fender linners are pvc and will ignite fairly easily. What does the spark plugs look like? Is there any indications it is one cylinder? How about a compression check to see if the cylinders are the same? Maybe a intake manifold blockage or cracked to run lean, I would recommend not driving it until it's figured out.
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Old 02-08-2017, 05:44 AM   #3
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One side hot and not the other is either a good restriction somewhere but you would likely be able to tell that when floored something was wrong or an electrical issue making the fueling be way off on that side.
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Old 02-08-2017, 03:12 PM   #4
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Originally Posted by Redtruck-VA View Post
Be careful the fender linners are pvc and will ignite fairly easily. What does the spark plugs look like? Is there any indications it is one cylinder? How about a compression check to see if the cylinders are the same? Maybe a intake manifold blockage or cracked to run lean, I would recommend not driving it until it's figured out.
I don't think we have pulled the spark plugs but I will know tomorrow when I talk to the mecchanic who has dealt with it the most. Too hard to get the pyrometer in to do a test on each port. I don't think he has ran a compression check, either, but all of these things you are mentioning would more than likely throw a code, wouldn't they? Family of 4 and we have 4 vehicles so it's kind of hard to just park it. Thanks for the input!
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Old 02-08-2017, 03:15 PM   #5
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One side hot and not the other is either a good restriction somewhere but you would likely be able to tell that when floored something was wrong or an electrical issue making the fueling be way off on that side.
I agree. I am almost convinced that it's just the muffler but it sure seems wierd. I am going out of town for a few days and I'm having the transmission filter and all sensors/solenoids accessible from the bottom side replaced while I am gone. When I get back I'll take it to get dual exhaust. That way if the problem still exists and especially if it turns into a misfire at least we'll be able to hear it better!!! Thanks for the input!
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Old 02-08-2017, 03:17 PM   #6
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One side hot and not the other is either a good restriction somewhere but you would likely be able to tell that when floored something was wrong or an electrical issue making the fueling be way off on that side.
Oh and no, performance doesn't seem to be affected at all. It's a HEMI through and through...AMAZING! And even after 195,000 miles!
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Old 02-08-2017, 04:43 PM   #7
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Good luck....
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