Hemi misfire - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 8 (permalink) Old 04-15-2017, 09:27 AM Thread Starter
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Hemi misfire

Hi Guys next week i am collecting my new to me 2006 Jeep GC with 5.7 Hemi with 59000 miles and the seller says it has a slight miss which he thinks is a coil or a plug. is this a common issue and are there any other things to check, i have read of valve seat and piston problems with US cars but have there been any of these issues with GRAZ built euro cars?? I know this isn't the Jeep forum but they are all the same engine in the same family and this is where i find all the best knowledge

I will be checking for codes but i am trying to get as much info as possible prior to checking the car out on tuesday.

any help appreciated.

Alan.

2006 56 crd tourer Mineral Grey.SOLD
Dec 2007 SRT8 Black tourer with Tints.SOLD
2006 MERC C320 v6 cdi in Black. SOLD
2006 MERC E280 V6 CDI Estate in Blue. SOLD
defected to BMW with a V8 X5. sold

2008 Jeep Grand Cherokee 3ltr crd Overland
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post #2 of 8 (permalink) Old 04-16-2017, 05:08 AM
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Car: 2006 Chrysler 5.7 Hemi STARTECH EDITION PRINS VSI LPG & KEIHIN INJECTORS (AIRLIFT PERFORMANCE) AUTOPILOT V2
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Good to hear from you!

5.7 lump is as bullet proof as the 6.1. I acquired my touring in 2010 (same time when I saw your 6.1 for sale on autotrader), when the mileage was around 34K and its now just passed a tad over 70K and still going strong. There are lots of stuff in relation to dropped valve seats as you mention but the info across all forums seems to relate to non euro spec models. Also as you know I converted it to run on LPG which burns dry and at much higher temperatures than petrol, so if there were weaknesses with the valve seats, it should have happened a long while ago.

I haven't experienced any misfiring but its usually a coil pack or the lead.

Are you able to use Autel to pin point the faulty coil pack, hopefully its just the one that needs changing?

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post #3 of 8 (permalink) Old 04-16-2017, 06:25 AM Thread Starter
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Hi badgx, I will be doing pre-purchase checks on tuesday when i go to pick up the car. hopefully my Autel will pinpoint the problem and it will just be a coil or plug or a loose hose.
I intend to LPG the car but your system is a bit steep for me, I will probably fit a Stag system, I fitted a stag 300 system to my landcruiser about 10 year ago and it worked well.
Hopefully the car will be as good as it looks in the pics.
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post #4 of 8 (permalink) Old 04-19-2017, 03:49 AM Thread Starter
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Update...I checked the car over and it does have a apparent misfire at tickover and when reved, the Autel didn't pick up any misfire codes.

I also noticed a strong smell of petrol under bonnet when the car was started that faded over the next minute or so each time it was started.

The engine sounded sweet as a nut with no rattles.

took it for a short drive and it seemed to drive really well but when it got up to around 40 a really bad stutter started, I thought it may be the MDS not activating properly.

So any ideas on the fuel smell and could that be causing the rough running? and what could the stutter be at 40.

I really like the car but i want to be sure the issues are not too major before i pull the trigger.

Last edited by Boro al; 04-19-2017 at 03:50 AM.
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post #5 of 8 (permalink) Old 04-19-2017, 03:10 PM
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Surprised to hear Autel wasn't able to pick up any codes, which is strange??? Have you tried disconnecting the electrical socket at anyone of the coil packs to check to see if Autel picked up any codes? If you disconnected the socket, in theory it should collect a solid code.

Perhaps if its not Autel, do you think it might be something non electrical related, like a small fuel leak at the rails causing starvation or perhaps a loose or even a failing spark plug or something? The leads generally fit snug on the plugs when the coil packs are tightened down and the original spark plugs which should be tightened down are Champion plugs which are good for 30k but can get much higher miles/usage out of them.

I don't have much experience with my MDS module. I've switched off the MDS feature on mine for a long while now since it had a habit of confusing the Prins ECU. As I remember on stock tune, the MDS mostly activated with stable speeds for example on motorways or on downhill stretches especially with the foot feathered or away from the pedal. On the other hand with the predators tunes, the MDS used to come alive much more frequently around town or narrow country lanes.

Hope your able to locate the issue, will be interesting to see what was causing the misfiring, hope its something simple & service related as it look like a nice GC.
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post #6 of 8 (permalink) Old 04-20-2017, 12:50 AM
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The other same thing you might also want to check is to unplug the electrical socket at one of the injectors to see if Autel had picked up a code. Its unusual for injectors to fail though but just to see if Autel had picked up the code. The petrol smell might mean the injectors are delivering the fuel which hasn't been ignited and just collecting, due to misfiring.

To gain access to these bits the turtle shell or engine cover needs to be lifted up, which is easy to do.

Hope the garage are okay with this.
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post #7 of 8 (permalink) Old 04-20-2017, 04:25 AM Thread Starter
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I had the cover off to check plug wires etc, couldn't find anything obvious, without a code to point to a particular cylinder i had nowhere to start.

It never ocured to me to cause a fault to check out the Autel.

I did wonder if the fuel smell was due to a dodgy injector and that could also be causing the miss

I also wondered whether the stutter was the torque converter clutch not locking up properly, that was my main reason for stalling on pulling the trigger

I didn't get the opportunity to go faster and see what happened if it drove through the stutter, I should mention that the stutter occured as the box appeared to change up a gear so it may be box or t/c.

just remembered the Autel did show a couple of faulty wheel speed sensors, the ABS light was on but no EML

trans fluid was clean as new no smells, It is not the NAG 1 box it is the Chrysler/jeep hemi box and changes were smooth until the stutter.

Anyone got any ideas? I do remember reading a post a while back about t/c vibration or something similar.

Last edited by Boro al; 04-20-2017 at 05:14 AM.
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post #8 of 8 (permalink) Old 04-20-2017, 05:19 PM
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Seen this link here which describes t/c symptoms and mentions shuddering at speeds between 30 to 45mph, which comes and goes. A possible cure for it is an fluid and filter change.

It might be best to pass this, sounds a bit risky. Sofar there's no explanation with regards to the petrol smell in the engine and the fluid appears clean.

Worth keeping an eye out for other GC's, allow taking this risk here, the repair may become costly.

http://transmissionrepairguy.com/tor...rter-problems/
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