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Chrysler300 Misfire after Tune Up.
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ThePain321
Novice
Nov 9, 2020, 7:13 AM
Post #1 of 14
(982 views)
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Chrysler300 Misfire after Tune Up.
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Have a high mileage Chrysler 300 sitting in my yard currently. Is a 2010 6cylinder. I’m not familiar with the car so I’m asking you all. And starting with the basic info.
Wasnt misfiring yesterday prior to swapping spark plugs, and new rubber boots on the individual ‘ignition coils or coil packs’ is what I think they’re called. It’s possible the 3 ignition coils on one side were taken out together, then not placed back into the same cylinder it came. Are they required to be? Like, Are these ignition coils cylinder specific? It’s my thought that they are not, because they aren’t sold for each cylinder. However, does that mean once they are installed the computer flashes software to bind it to a particular cylinder? I’m not sure what to do to figure out what’s causing the misfire at this point. I’ve reassembled it and checked connections 3 total times yesterday. I’m certain electrical connection is good. Maybe a reflash by an OBD tool? Or turn it on, then unplug each cylinder one at a time. If it runs better unplugged, that coil isn’t attached to correct cylinder if they are cyclinder specific? I was hesitant to try this though while running without checking with someone that might know better first. Thanks!
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Sidom
Veteran
/ Moderator
Nov 9, 2020, 9:13 AM
Post #2 of 14
(962 views)
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Re: Chrysler300 Misfire after Tune Up.
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If there is a misfire, then the check engine light should be on and a code stored.
Start off with pulling the code to see which cyl is misfiring.
It could be as simple as a bad plug.
The coils are interchangeable so that isn't a problem.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 9:25 AM
Post #3 of 14
(958 views)
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Re: Chrysler300 Misfire after Tune Up.
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You could have damaged one of the plugs or just missed the plug entirely when the coil was installed.
It doesn't matter which hole the coil goes back into but it DOES matter if the wire connectors get switched. Check that.
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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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ThePain321
Novice
Nov 9, 2020, 9:59 AM
Post #4 of 14
(950 views)
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Re: Chrysler300 Misfire after Tune Up.
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Thanks for the tips. I’ve been searching around for a scan tool this morning to help know exactly which cylinders. I’ll re check the connector is on the right coil. I’ll post when I’ve resolved this. Will be at it all day today so I’m hopeful.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 10:04 AM
Post #5 of 14
(946 views)
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Re: Chrysler300 Misfire after Tune Up.
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If you dropped any of the spark plugs, they are likely cracked and that will definitely cause a misfire.
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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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 1:41 PM
Post #6 of 14
(929 views)
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Re: Chrysler300 Misfire after Tune Up.
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Yikes if you did drop a plug on anything mark which one it went to right away if you didn't quit and get another. High voltage will jump quite a bit mess up any show once packaging was lots better too I'm not finding that now,
T
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ThePain321
Novice
Nov 9, 2020, 2:39 PM
Post #7 of 14
(923 views)
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Re: Chrysler300 Misfire after Tune Up.
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The plugs themselves are tested as good. Misfire still occurs. Eventually sputters so hard it dies. Got obd scanner. And now I’m more lost. Says Emissions related DTCs... is on an innova 3130lat. Under vehicle info, it shows each cylinder as being “ok.” Also the wiring is going to the correct coil. Reverified, the plug isn’t even able to reach a neighboring coil. I’ve now dedicated the rest of my afternoon to this car.
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ThePain321
Novice
Nov 9, 2020, 2:47 PM
Post #8 of 14
(916 views)
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Re: Chrysler300 Misfire after Tune Up.
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The only code I’m able to get is, P2172.
High Airflow/Vacuum Leak Detected (Instantaneous Accumulation)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 2:51 PM
Post #9 of 14
(914 views)
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Re: Chrysler300 Misfire after Tune Up.
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Refresh already said just expounding: 40 to 60,000 volts not amps can jump inches. A freaking plug is brittle porcelain or coils, wires and such isolate HATE any disruption or mishandling.
Tricks include spray water (salty water faster) on suspect items. That plastic of high voltage can't take any crap, dropped or like that new.
On a rant (sorry and mean that) part and try #3 on a caliper (threads stripped clean out on new redo ones) nothing to do this parts SUK vs OE can't believe what gets thru and sold,
Tom
PS: on edit: That was a $188.83 (my cost) part from the best outlet I know of. OMG now what?
(This post was edited by Tom Greenleaf on Nov 9, 2020, 2:54 PM)
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ThePain321
Novice
Nov 9, 2020, 3:00 PM
Post #11 of 14
(902 views)
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Re: Chrysler300 Misfire after Tune Up.
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The plugs themselves are tested as good. What the hell does that mean? There is no such test to detect a crack or anything else wrong with a plug. You have a code right in front of you telling you that you have a massive vacuum leak.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 3:09 PM
Post #12 of 14
(896 views)
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Re: Chrysler300 Misfire after Tune Up.
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So am I. There is no test to determine if a plug was damaged when dropped.
And you don't need to run an engine to read codes unless you previously deleted them.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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ThePain321
Novice
Nov 9, 2020, 4:29 PM
Post #13 of 14
(887 views)
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Re: Chrysler300 Misfire after Tune Up.
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Resolved. Problem was when removing the plastic air cover the large metal vacuum line shifted. I couldn’t budge it with my hand, but it twist almost freely with a small set of pliers on it. Pushed it back snug, the car runs smooth. Such a simple thing that caused huge issue. I could see it bumping out in time since no screw holds it. Just tension from the pipe. Thanks to all for the tips.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 9, 2020, 4:34 PM
Post #14 of 14
(883 views)
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Re: Chrysler300 Misfire after Tune Up.
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OK, closing this now as solved.
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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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