Strange Intermittent Missfire On Bank 2

Derrick Diagnostician Kentucky Posted   Latest   Edited  
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Driveability
2016 Chrysler Town & Country Li 3.6L (ERB) 6-spd (62TE)
P0300 — Random/Multiple Cylinder Misfire Detected
P0302 — Cylinder 2 Misfire Detected
P0304 — Cylinder 4 Misfire Detected
P0306 — Cylinder 6 Misfire Detected
Missfire

this vehicle has an intermittent misfire on acceleration isolated to bank 2. Seen the older tsb in relation to this penstar engine after going over basics thought i would do a leak down test suggested by tsb. All cylinders on bank 2 did pass the test. i put a set of plugs in ass well to rule that out while i was at it. Fuel trims look good show no sine of being the cause. While Trying to rule out a vvt issue had a bit of problem the data not sure how chrysler is parsing this out. my desired and actual stay inline give or take a dagree or 2 at times. But whats curious to me is the desired never moves on any cam . While i see the cam/crank difference pid for each cam change dramatically at times while driving. Perhaps someone could shed some light on that for me and maybe give me some other suggestions on my misfire issue

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Glenn Owner/Technician
Texas
Glenn
 

Hi Derrick, This is where 3 simple tests focus in on the issue. One: a pressure transducer and compare 1 cylinder on each bank. Two: A vacuum transducer to monitor intake pulses. Three: A tailpipe pressure transducer to monitor the exhaust pulses. Add a channel to synch one of the coils to establish and confirm if it is actually the one bank and merge the data with a firing order. The idea is…

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Derrick Diagnostician
Kentucky
Derrick
 

I may give it a try problem is this miss is intermittent.. You have to driving and under moderate to heavy load to experience it. Then you only count 5 or 6 misfires on each cylinder simultaneously so im skeptical testing under idle will produce usable results but worth a shot … im aware of the idea I found that a little patronizing. No hard feeling though thanks

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Glenn Owner/Technician
Texas
Glenn
 

Hi Derrick, I was not trying to be insulting earlier, I apologize. Sometimes I am guilty of sounding condescending. (To many years as a military instructor can affect a person. LOL) Tanner Clay brought up a good point about the oil galley plugs. There have been several cases mentioned here and on other sites where these back out. The effect is not a total loss of oil pressure, but it will…

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Derrick Diagnostician
Kentucky
Derrick
 

No problem I appreciate the help. Im going to give that a look later today

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Tanner Diagnostician
Kansas
Tanner
 

I had this exact problem on a Town & Country with 3.6.. After endless hours of chasing it ended up being the oil galley plug on the right hand cylinder head . Specifically the one under the intake cam didnt have any drivetrain noise which is funny.

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Matthew Technician
Nova Scotia
Matthew
 

These were a bolt threaded into the cylinder head behind the timing cover right? I remember having one with oil pressure issues and ended up finding on of the oil gallery bolts backed out to the point it was touching the timing cover.

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Tanner Diagnostician
Kansas
Tanner
 

Yes correct the one I had backed all the way out….funny thing is later on like 20 thous miles the vehicle came back for oil psi warning coming on when turning. That ended up being oil pump strainer fell off.

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Derrick Diagnostician
Kentucky
Derrick
 

U hit the nail on the head brother thank you…. Plug was backed off a few turns tightened it up and wallah no miss. I had no codes related to vvt only missfire codes. After repair vvt actual and desired moved and operated normally.

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Thanks