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post #1 of 25 (permalink) Old 01-03-2015, 04:38 PM Thread Starter
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help with a long standing problem

Hi all

hoping you can advise on a long standing problem I've got with my 2007 with 5.7 Hemi.

The problem is with a misfire which neither the dealer or local independent can resolve, its been going on for 2 years, I will describe what the symptoms are and what has been done so far.

Symptoms first. -
  • Basically the misfire occurs at low revs, low throttle opening, low load conditions. but it is intermittent (I can replicate it pretty much when I want too)
  • it occurs both on Petrol and LPG in the same way,
  • if you kick-down, it clears up,
  • if you take it out of drive(D) and put it in 3or2 it clears it (higher revs?).
  • it is more noticeable when the MDS is active but not always, I have an MDS light installed so I know when it is active.
  • I think it occurs more in warm weather (I live in the UK so it is never that Hot!)
  • It does not miss-fire when the engine is cold
  • I think it does it more when the kids are in the back seats! - no, seriously!
  • Most of the time I can replicate the problem when driving at 30mph with 1k revs and I slightly feather the throttle
  • I have never had a DT light come on or had a code to retrieve

what I have done:
  1. changed all 16 plugs for double iridium
  2. bought a coil pack and methodically moved it around all 8 cylinders
  3. Taken it to the local Jeep dealer who acknowledged they could feel the intermittent misfire but could not diagnose it! the recommended I let it get worse so they could find it!
  4. same reply from a local jeep independent garage.
I have a proper manual to work through diagnostics, but any advice anybody has on where to start would be great. does anybody have a complete schematic for the engine management system (sensors, connections etc.) and for the Ignition system as well. the manual does not have an overview of either system.

All help advice will be very welcome

cheers

Jim
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post #2 of 25 (permalink) Old 01-03-2015, 08:28 PM
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Have you tried using the OEM Champion RE14MCC4 (570) copper spark plugs?
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post #3 of 25 (permalink) Old 01-04-2015, 05:04 AM Thread Starter
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yes I used these plugs before fitting double iridium, I changed plugs from copper to try and resolve my issue

thanks for the post though

cheers

jim
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post #4 of 25 (permalink) Old 01-04-2015, 06:53 AM
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Join Date: May 2009
Location: Cleveland TN
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Model year: 2006
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To see if it is related to the MDS, turn off MDS by turning on the "Tow/Haul" button

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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post #5 of 25 (permalink) Old 01-04-2015, 01:43 PM Thread Starter
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thanks I will try this tomorrow, does tow/haul just keep the autobox out of high like taking out out of drive? or does it also impact ignition and fuel controls?
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post #6 of 25 (permalink) Old 01-04-2015, 07:01 PM
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Join Date: May 2009
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All I know is it keeps it in one lower gear and the MDS does not kick in. It may also keep in each gear longer before shifting. It may affect other things but do not know what.

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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post #7 of 25 (permalink) Old 01-04-2015, 07:34 PM
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jcasey007; you asked about an '07 5.7 HEMI, but your signature says you have an '06 5.7 HEMI. Which is it? This is important to the last couple of posts, since the '06 was not available with MDS.
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post #8 of 25 (permalink) Old 01-04-2015, 08:40 PM
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Join Date: Jun 2006
Location: South Carolina
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
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If 4WD - system: QD-II
Current Mileage: 38,000
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Quote:
Originally Posted by maytag View Post
jcasey007; you asked about an '07 5.7 HEMI, but your signature says you have an '06 5.7 HEMI. Which is it? This is important to the last couple of posts, since the '06 was not available with MDS.
The 2006 Commander's with HEMIs DO have MDS. Please don't comment on things you know nothing about.

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
Quadra-Drive II, NAV, DVD, Trailer Tow Group IV, Off-Road Group II, Remote Start, UConnect, Rear Backup Camera, Chrome Wheels,
Magnaflow cat-back exhaust, Daytime Running Lights enabled, 2" Rough Country Lift with 265/70R17 Goodyear Wrangler AT/S

Last edited by jeep5253; 01-04-2015 at 08:45 PM.
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post #9 of 25 (permalink) Old 01-04-2015, 09:20 PM
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Long shot but maybe try seafoam in your gas tank or something that can clean off your injectors and plugs also any build up that could be on or around the valves it could be predetonation..... maybe try a higher grade of gas... 93 octane
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post #10 of 25 (permalink) Old 01-04-2015, 10:49 PM
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Join Date: Dec 2014
Location: East Meadow, NY
Own a Commander?: Yes
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It would help if you could see if it was just one of the cylinders misfiring or does it travel across the firing order. Knowing this would help in which direction to begin diagnosis. If it is across the firing order then you may have a control issue (possible bad connector somewhere giving too much resistance value from corrosion).
If it is one cylinder, then you can check the related items for that piston (fuel injector, coil pack, connections to the pack, connections from controller to pack... etc..
Once a season I disconnect (one by one) all of my engine components and clean the connectors out with a toothbrush and spray with electronics cleaner. I will ensure all connectors have nice clean shinny tabs before I reinstall.
After owning a cherokee, I have become paranoid with connectors and corrosion... It will drive the controller wonky!!!
That would be a first thing to do really to remove variation that bad connections will do. After that then we could look deeper.
By the way, what kind of shop are you at that cannot plug a monitoring machine to the vehicle and give you direct info on the running of the motor? I can do this at home with my programmer.
Buy one of the many computers out there (Diablo Intune ect...) and set that vehicle to the fuel you will use the most, they even option the MDS out if you want.

Dave

Hope this gives you a start, seems like the car is drivable.
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