Durango 5.2L ignition fails
#3004969
01/13/22 04:28 PM
01/13/22 04:28 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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Falcon, CO
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Hi all, I hope someone may know why my daughter's '99 Durango tends to stop running with a warm engine. This has been happening in the last 6 weeks, 4 times. Found out that if I let the engine cool for at least 1 hour, it starts again. Yesterday it failed again but I couldn't get to start 3 different times over 4 hours.
I went back this morning and it started rough and then it smoothed the idle. I drove it home, parked it let it warm up and it just kept running.
I bought the Durango 4 1/2 years ago and the original owner had installed an M1 intake, and MSD 6A ignition setup, headers and he may also may have installed a cam.
In the last 10 days, I replaced the spark plugs, the cap and rotor, installed a new MSD Blaster coil; I replaced the plug wires in May, 2020, and they have 41,000 miles on them. The engine still has the original distributor but I haven't changed the pickup coil. I'm stumped right now, I need some new ideas. Thanks, Tony
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: 71pettyblue]
#3005007
01/13/22 07:03 PM
01/13/22 07:03 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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I had a LOT of trouble with the MSD in my '82 Ramcharger. I had it all mounted in the cavernous area under the driver's seat so no problems with heat. I had it wired so by just switching a couple of wiring plugs under the hood I could be running on the original mopar electronic ignition system. Whenever it died, that was the solution. The benefit from running the MSD was so minimal and the hassle of getting out and changing the wiring so great it made me eventually abandon the system. I suspect the box itself was intermittently bad but I never pursued getting it fixed or installing a new one. Dad had similar problems and had his repaired at MSD as he lived nearby and it worked fine afterwards.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Durango 5.2L ignition fails
[Re: RTSrunner]
#3005009
01/13/22 07:08 PM
01/13/22 07:08 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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Original distributor, MSD was added on around 2000-04. Haven't checked fuel pressure, but I installed a new pump last November. Spark is good, and yesterday when I checked it was getting spark at the plugs, but wouldn't start until this morning.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: 71pettyblue]
#3005011
01/13/22 07:10 PM
01/13/22 07:10 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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I'm debating to install a new 6A box.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: volaredon]
#3005018
01/13/22 07:26 PM
01/13/22 07:26 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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Champion 7436 double platinum, MSD coil, Standard brand cap & rotor at O'Reilly.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: 71pettyblue]
#3005028
01/13/22 07:49 PM
01/13/22 07:49 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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Sounds like injector driver bad in the confuser or maybe bad cam sensor (the flat plate like sensor in the distributor.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Durango 5.2L ignition fails
[Re: HotRodDave]
#3005032
01/13/22 07:56 PM
01/13/22 07:56 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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Sounds like injector driver bad in the confuser or maybe bad cam sensor (the flat plate like sensor in the distributor. Since he said he has spark I agree. But isn't there something about the computer needing to see spark or RPM before it'll fire the injectors? I seem to recall reading something like that years ago.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Durango 5.2L ignition fails
[Re: 3hundred]
#3005103
01/13/22 11:16 PM
01/13/22 11:16 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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My friend did some research on this, it maybe the crankshaft sensor. In 2000 it happened to our '91 Cherokee with a 4.0L.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: 71pettyblue]
#3005107
01/13/22 11:36 PM
01/13/22 11:36 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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I Live Here
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I'm on really thin ice here, but I don't think the plugs will fire without a crankshaft and camshaft position sensor signal.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Durango 5.2L ignition fails
[Re: 3hundred]
#3005109
01/13/22 11:44 PM
01/13/22 11:44 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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That's true, the engine sounds like it's not getting fuel. But once it cools down, it acts like it's flooded and starts within seconds.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: 71pettyblue]
#3005112
01/13/22 11:49 PM
01/13/22 11:49 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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I Live Here
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Colleyville
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I'm starting to be inclined towards the computer (PCM) being on it's death bed.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Durango 5.2L ignition fails
[Re: jerseybud]
#3005322
01/14/22 06:38 PM
01/14/22 06:38 PM
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Joined: Apr 2005
Posts: 727 Falcon, CO
71pettyblue
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Pulled CPS, checked the ohms, resistance was higher than a new CPS. We installed, engine fired immediately. Thanks again for of the suggestions.
Tony Retired Mopar Enthusiast
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Re: Durango 5.2L ignition fails
[Re: jerseybud]
#3005469
01/15/22 09:55 AM
01/15/22 09:55 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
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Posts: 8,162
USA
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This will be OBD 2, so a scan of codes is a must. The aftermarket fuel pumps seem to be built to fail at excactly 1 year now. Sock filter below the in tank fuel pump can get clogged with crud and will “cavitate” the flow of fuel into the pump. This will cause the engine to suddenly die from near zero fuel pressure, but re-start and run flawlessly for awhile after only a few degrees of cool down from being off.
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