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Dodge Charger 2015 Misfire

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Feb 26, 2023, 7:31 PM

Post #1 of 10 (248 views)
Dodge Charger 2015 Misfire Sign In

Car details are as follows:
Make: Dodge
Model: Charger
Year: 2015
Engine: 3.6L Penstar
Mileage: 120,000

Problem description:

I purchased this car pre owned with 20k miles. Regular oil changes, sparkplug and coil pack replacements, Trans flushes, Filter changes, etc.
I think I was over on a oil change once but usually I would do it early if it was already in a shop.

That said I've traveled alot and since may 2015 have put 100k miles on it. This required me to us multiple shops in different states over the years. A couple years ago I noticed harsh or hesitated shifting along with a slight intermittent bump while idle. I was told it was a control module and a update would fix everything.

Multiple times over the past few years I took it to dodge complaining about this module as that's what I was always was told is wrong. And I just gotta keep paying and having it updated. But then I'd have been giving these guys hundreds a year to keep up with this.

I told them the slight bump might be a misfire but it's so slight you might notice it as it's not while driving. You have to sit in idle and wait, I was told there's no issue over and over because theres no code. Then my gas mileage very slowly started to drop. Which I know is normal to some degree.

Well fast forward to a couple days ago, I start my car and it misfires so hard I thought my car was gonna explode. It was just one time on start up an hadnt been ran in days. This has never happened nor anything noticeable like this. It instantly throws a check engine light and I run it to find its a P0300 code, random or multiple misfire. And almost instantly my gas mileage goes from a 19 mpg average which is normal at this point to like 13.5. I try to recreate this and now don't get a misfire code but a faulty Air Intake temperature sensor code.

But when I say instantly I mean going 40mph for 5 miles just to test it. I can watch my milage go down by the tenths activity even in idle. I start to look at my engine just to see what's up and if there's any visible issues. I've also noticed a loss of power Slightly until in motion, RPM flutter in idle, and just that little bump as always.

I find my air intake hose isn't attached to the throttle body or even close to it. It's just crammed under the cover. Then as I'm looking at the throttle body I'm noticing bolts half in on the engine under it, what appear to be leaks, a hose that I can't figure out at all, a possible audible compressed air leak behind the throttle body close to the hoses that run into the dash basically(AC not on), and decided to go no further as I have no clue what's been done. Because to my knowledge I've needed no major repairs.

Any insight would be helpful.
Thank you.

(This post was edited by Hammer Time on Feb 27, 2023, 4:42 AM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 26, 2023, 8:08 PM

Post #2 of 10 (239 views)
Re: Dodge Charger 2015 Misfire Sign In

Am I reading you right that the intake snorkel was not attached to the throttle body?


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


Feb 26, 2023, 9:15 PM

Post #3 of 10 (224 views)
Re: Dodge Charger 2015 Misfire Sign In

I believe so, so the airfilter that's in the front most driver side right? It's 2 parts, one attaches to where air flows into and through the filter. The 2nd part attaches to where the air flow exits the filter and into the throttle body. You'd never see it unless you looked and I don't work on cars at all. But yes the throttle body was just sucking unfiltered, uncirculated, and without that the temperature sensor was doing nothing as well.
Once I reattached that my air temp sensor code through as needing replaced. So it never threw a code to let me know there was a issue or that it was disconnected until I reconnected it, ironic.

Then this tube that is maybe 1/4th inch diameter and has a little plastic L piece at the end sits in the middle of the top of the engine. Right infront of the exhaust manifold. I cant find where it goes, it wraps around the driver side of the engine and connects almost to what I believe to be the transmission. It connects right to the top of it right before where the transmission and engine meet but before the trans is going under the car towards the drive shaft. I assume it's important but running or not no air or fluids come through its just there. Looking more at diagrams I believe it's a vent tube but just checking.

I'm so far from a mechanic it's not funny so please work with me if I'm 100% wrong here.

(This post was edited by TecEx on Feb 26, 2023, 9:20 PM)

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Sidom profile image

Feb 26, 2023, 10:57 PM

Post #4 of 10 (201 views)
Re: Dodge Charger 2015 Misfire Sign In

If you could post a picture that would be very helpful. The tube you described almost sounds like it's for the blow by of a valve covers to the air intake hose?

With computer systems there are primary inputs.... Coolant temp sensor, Throttle position sensor, 02 sensor, etc. When these go bad they can have a major effect on how the engine runs. Then there are secondary inputs like air intake, oil temp And a whole bunch of others. These are more for " fine tuning" When they go out they don't have as Big of an effect on how the engine runs, Sometimes it's not noticeable at all, Besides the check engine light being on.

If I'm understanding your post correctly and the air intake hose was left off the throttle body for a period of time, Then at a minimum the tothrottle body needs to be cleaned.


Feb 27, 2023, 12:16 AM

Post #5 of 10 (192 views)
Re: Dodge Charger 2015 Misfire Sign In

So the red circle is that little hose, the rest are just photos I took before it starting storming and I had to stop. I tried to show things best i could.

But yea I just always took it to supposedly reputable places and don't know jack about mechanical stuff. I can build a house and maybe change my oil, spark plugs, and filters but that's about it and it'll take me a embarrassingly long time to do that.

I'm just so lost as to what's going on, little bump for years, ECM reprogramming constantly to fix hesitation, surges, gas milage loss, shifting issues, power loss, etc. Always paying for routine maintenance, diagnosis/diagnostics, and following guidelines for longest life expectancy and empty wallet along with being told I'm just paranoid.

Huge bang on startup from engine, definitely not backfire. Misfire code and try to recreate but now 10mpg loss over a 5 mile test run at 40mph, rpm flutter below probably 300-500rpm, no misfire code but same bump, and a new air intake temp sensor code.
And that's it, oh and the Class action against FCA US stating these engines over time circulate metal shavings from the rockers grinding the cam in potentially millions or 3.6L Penstar engines due to incorrect manufacturing of parts, electronics timing errors, etc. That just started barely a year ago.

Sorry that I'm repeating myself. But if I can provide any more info just let me know and I'll get it as soon as possible. Thanks yall.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 27, 2023, 1:37 AM

Post #6 of 10 (177 views)
Re: Dodge Charger 2015 Misfire Sign In

Just a comment on this already hard to read thread with assorted issues all at once.
Tec > Please don't go back to post 1 to add pics just asked for it confuses it now.

Bolt left loose? Saw a wire tie and uncovered throttle plate? Who's messing with it you to show that or found these things?

It's been a bit man-handled IMO, runs like crap, misfires are going to ruin fuel consumption now some "lore" of a chronic problem with these and suit underway!

Pics nice, a bit large should be under what Sidom asked not up top now harder to read and make sense of this.

Wish you luck with it traveling and assorted shops/techs trying shouldn't matter but don't think it helped anything along the way,



Feb 27, 2023, 2:29 AM

Post #7 of 10 (175 views)
Re: Dodge Charger 2015 Misfire Sign In

I apologize about the pictures. And as far as the details I just tried to include what was said in the "read before posting thread" and to include as many details about it as possible since you can't actually be here and the history matters to some degree because this isn't a short timeframe issue.

As for the lore regarding thay issue it fits 90% of that description. So its just concerning, specially when financially I can't take a hit right now.

I pretty much did this:
~Removed engine cover
~Removed 2 parts of air intake leading to throttle body(1 screw, 1 wire)
~Partially removed exhaust manifold(5 bolts)
~Partially removed throttle body(1 wire, 1 hose)
~Replaced from last step to first

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 27, 2023, 3:52 AM

Post #8 of 10 (167 views)
Re: Dodge Charger 2015 Misfire Sign In

Hang on you've done well and very complete. Allow the others to take this as they responded right along. I hear you if there's some justice it could be years and many can't just take a hit now see what suggestions can help. Keep all documents or hope you can for another day even if sold off too cheap you may get re-imbursed? Wait - it's early for most they'll come in later, Tom


Feb 27, 2023, 4:29 AM

Post #9 of 10 (160 views)
Re: Dodge Charger 2015 Misfire Sign In

Haha yea we can only hope, but we all know these things wind up pennies on the dollar settled in god knows how many years. And I still plan on doing as much self diagnosis as humanly possible.

Once I can go no more in time or finances I'll sell it for however much I can get running or for parts. And all I got to have to get reimbursed under the lawsuit guide is pretty much have got it from dealer with dealer parts affected and I'm 100% in there.

And I revised my original post to be something wayyyy cleaner and easily understood. You think I should edit it? I mean it's alot better, more organized, less irrelevant detail, etc.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 27, 2023, 4:49 AM

Post #10 of 10 (146 views)
Re: Dodge Charger 2015 Misfire Sign In

Your pictures were very helpful but way too large and made it too hard to read subsequent responses.

Please reduce the size by at least 50% and repost them. It's very easy to do with our imaging tool.

Click on this icon with the picture highlighted.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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