Stumped: CEL and Running Rough
Record Breaker
Joined: Dec 2011
Posts: 1,530
Likes: 1
From: Lakefield, Ontario
Well I threw the sensor back in for the meantime and reset the CPU.. CEL hasn't come back yet but I wouldn't be surprised if it did. What's a good brink for the crank sensors? Also I do think my cat is causing the rattling noise when I let up off the gas.. could that be causing the miss? I don't wanna keep throwing my money at it but I got a feeling the old plenum did a number on my cat.. the truck was consuming 2 quarts in about a week before the new install!
Standard Motor Products.
To me it really sounds like you need to a compression test and see where this motor is at before you spend more money on it. If you're burnin that much oil, it went to your cat and good chance the heads cracked.
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Professional
Joined: Feb 2011
Posts: 203
Likes: 0
From: Ipswich MA
That sounds about right, that would be my luck for sure. Lol I don't currently have the tool but I will see if I can get my hands on one.
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
At that rate of oil consumption your cat was killed by the end of the first week. They'll burn off small amounts of oil just fine in normal operation, but if you've got serious oil control problems the cat's substrate gets oil soaked and can't generate heat enough to get the job done. When the expensivum metals that create the chemical reaction that makes cats work (get hot) never actually see the exhaust through that coating of oil the reaction doesn't get cranked up as it should. That leaves you with a cat that first fails to do its job of cleaning up the exhaust, then becomes carbon fouled to dam up the exhaust stream. In these and many other engines, cracked heads soon follow because the cylinders overheat due to that exhaust restriction.
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Professional
Joined: Feb 2011
Posts: 203
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From: Ipswich MA
That leaves you with a cat that first fails to do its job of cleaning up the exhaust, then becomes carbon fouled to dam up the exhaust stream. In these and many other engines, cracked heads soon follow because the cylinders overheat due to that exhaust restriction.
Thank you to everyone for the helpful responses!
I will make sure to follow up afterwards
Record Breaker
Joined: Dec 2011
Posts: 1,530
Likes: 1
From: Lakefield, Ontario
At that rate of oil consumption your cat was killed by the end of the first week. They'll burn off small amounts of oil just fine in normal operation, but if you've got serious oil control problems the cat's substrate gets oil soaked and can't generate heat enough to get the job done. When the expensivum metals that create the chemical reaction that makes cats work (get hot) never actually see the exhaust through that coating of oil the reaction doesn't get cranked up as it should. That leaves you with a cat that first fails to do its job of cleaning up the exhaust, then becomes carbon fouled to dam up the exhaust stream. In these and many other engines, cracked heads soon follow because the cylinders overheat due to that exhaust restriction.
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Professional
Joined: Feb 2011
Posts: 203
Likes: 0
From: Ipswich MA
I would have to agree that was a pretty awesome response! I really have to say THANK YOU to the guys here on dodgeforum! Over the years I have saved thousands by keeping my truck out of the shop with the information the members have provided! 
