Re: 2003 5.7 hemi suddenly misfiring.
[Re: MidPenMopar]
#2552552
09/20/18 10:32 PM
09/20/18 10:32 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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I had a similar situation with my 2007 Ram. It would run fine, then run as if I were trying to drive with 3 flat tires....Engine shuddering, lack of power. I was at around 58,000 miles. It turned out to be 2 defective lifters that were part of the MDS system. They are supposed to allow the engine to run on 4 cylinders at specific times but the 2 defective ones were hanging open and not letting the valves fully close. In short, 2 cylinders were not only NOT building compression but the intake and exhaust was getting sucked into the intake, contaminating the mixture for the entire engine. The shop had to replace the 2 lifters, pull the piston to hone away carbon deposits and install new rings on that piston. I hope that in your case it is something simpler. In 2006 when I bought a new '06 4wd, I first looked at another truck that was identical only it was 2 wd. They had to jump start it and once it was running, it acted just as you describe. Maybe your truck has a bad alternator or battery?
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Re: 2003 5.7 hemi suddenly misfiring.
[Re: Kern Dog]
#2552602
09/20/18 11:28 PM
09/20/18 11:28 PM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
OP
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OP
Looking for fun? Keep looking
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Maybe your truck has a bad alternator or battery? That was what we thought was wrong last year when this was happening. That the truck was not getting enough juice to the run the system so i had all that checked and maybe it is that but i tossed the stock radio which we thought was the issue draining the battery and all was fine for a year.
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Re: 2003 5.7 hemi suddenly misfiring.
[Re: MidPenMopar]
#2552706
09/21/18 08:09 AM
09/21/18 08:09 AM
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Joined: Jan 2003
Posts: 8,666 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,666
Buford, GA
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Not sure about Mopars but on Toyotas the CEL will flash if you have a misfire problem to alert you to a problem that could damage the catalytic converter. Your CEL comes on with key in run position, engine off? My '06 CTD had a loss of power on the interstate for a few miles then cleared up. CEL came on instantly and stayed on. IIRC, it was a TPS code or something similar on the throttle body. Cleared code to see if it came back but never did. But that was on a CTD, not a Hemi. Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: 2003 5.7 hemi suddenly misfiring.
[Re: MidPenMopar]
#2553338
09/22/18 07:33 PM
09/22/18 07:33 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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The sad truth is, without a full-range scanner, it's really hard to troubleshoot these newer cars.
The INTERNET, the MISinformation superhighway
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Re: 2003 5.7 hemi suddenly misfiring.
[Re: John_Kunkel]
#2553371
09/22/18 09:05 PM
09/22/18 09:05 PM
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Joined: Jan 2003
Posts: 8,666 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,666
Buford, GA
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The sad truth is, without a full-range scanner, it's really hard to troubleshoot these newer cars.
Very true. I once had a Prius that would turn on the Master Warning Light intermittently and only for a few seconds and not set any codes. Tech Assist wasn't much help as they had never had any reports of such a thing. After checking everything I and TA could think of, I finally had another tech drive while I watched the scanner data list. After about an hour I caught the light on out of the corner of my eye. Looking down the data list I noticed a spike in engine temp. Turned out it had just been picked up from a body shop and had an air bubble in the cooling system. When the temp spiked, it would turn on the MWL. The temp would turn on the fans and the light would go back out. Apples and oranges, I know, but I never would have found it without a scan tool (and a driver ). Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: 2003 5.7 hemi suddenly misfiring.
[Re: 70sixpkrt]
#2553582
09/23/18 12:27 PM
09/23/18 12:27 PM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
OP
Looking for fun? Keep looking
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OP
Looking for fun? Keep looking
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Throttle position sensor? Cam position sensor? Crank position sensor? Bad Coil? Probably one of those?? Next time i can get by my buddies shop i will see if there are any codes on his reader. Stu
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