2012 Hemi misfire please help
Site Moderator-Dodge Tech
Joined: Sep 2010
Posts: 3,724
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From: Nashville, Tennessee
A rebuttal to someone's post might be a good read. I'm sure the readers would love to know WHY the product they buy off the shelves is inferior, rather than a bunch of scoffing.
I don't use Seafoam, but from what I can see it's a toned down and less "user-dangerous" version of what I use every day.
True, there are people out there that overuse Seafoam and things like it. If you don't have an apparent driveability issue it's not the way to go, but the Techron/Gumout/whatever won't be of any relief if you have pronounced symptoms right now.
What's worse for the converters, poisoning from driving it with a catastrophic misfire or blowing some carbon flakes out the runners?
I don't use Seafoam, but from what I can see it's a toned down and less "user-dangerous" version of what I use every day.
True, there are people out there that overuse Seafoam and things like it. If you don't have an apparent driveability issue it's not the way to go, but the Techron/Gumout/whatever won't be of any relief if you have pronounced symptoms right now.
What's worse for the converters, poisoning from driving it with a catastrophic misfire or blowing some carbon flakes out the runners?
Last edited by TNtech; Nov 3, 2013 at 11:29 AM.
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Joined: Jun 2011
Posts: 1,770
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Well anyway`s.... nobody has the answer in here without actually being there and working on the OP`s truck in person to properly diagnois the actual problem. At this point, we`re ALL just throwing ideas and opinions around. Assuming NEW plugs and coil pack, ther are bigger issues.
TNtech, being that you work in a dealership, maybe you could copy/paste some flow charts out of a service manual in here for the OP...?
TNtech, being that you work in a dealership, maybe you could copy/paste some flow charts out of a service manual in here for the OP...?
Professional
Joined: Sep 2012
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Good gas fixed mine and I did not need a miracle in a bottle.
I think before using injection cleaner or seafoam, Has anyone suggested the OP to perform a compression test. Or a cylinder leak down test. Since the engine has 130k if I read the post correct, maybe cylinder 5 and 7 may have either valve problem like a flat camshaft or blown head gasket. That would be the first thing I would do at the dealership I work at.
Sure it could happen. I have seen flat cams and lifters on many 5.7 engines. Also seen burnt or broken valve springs and bent push rods. Also seen the back of the intake split open causing high idle and run like crap. On the early 3.3 minivans, the camshaft would snap off in half. Thats why you want to cover the basic's. Just remember K.I.S.S
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OP`s truck has 130,000K, thats why i suggested throwing some injection cleaner in the tank to maybe help clear/clean it out. Thats worked for me for many years on high mile fuel injected vehicles. Certainly cant hurt it any worse. Five bucks for a cheap fix is the least costly way to start in my opinion.
MASTER TECH has the right idea... do a compression test...!
And flat cams and such, hell yes, seen lots of them in the past.
MASTER TECH has the right idea... do a compression test...!
And flat cams and such, hell yes, seen lots of them in the past.
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Joined: Feb 2020
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Bad fuel
Bad fuel was my issue. Just for fun start filling up with chevron or some other name brand super. After a couple tanks see if the condition goes away. But for sure use a different gas station and brand.
I was having only one cyl misfire, you are having two which is more of a concern, but still a few tanks of quality gas might help.
I was having only one cyl misfire, you are having two which is more of a concern, but still a few tanks of quality gas might help.
When you had the bad gas did it smoke really bad?