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2003 5.7 hemi suddenly misfiring. #2552505
09/20/18 09:03 PM
09/20/18 09:03 PM
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South San Francisco, Californi...
MidPenMopar Offline OP
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Looking for some advice on a problem with my 2003 Ram 1500 4x4 5.7 hemi engine with 85,000 miles.

Today as i left a quick doctors appt the engine started acting like it was running an 7 or 6 cylinders. No matter how much i added throttle it would hardly move more than say 15 MPH. I was able to keep going by putting it natural and coasting down hill with it like this for say a 1/4 mile than all of a sudden the engine stated running fine.

I had this same thing happen about a year ago and i took it to couple of different shops and none of them could find any codes or anything that was wrong as it wouldn't malfunction for them. So i just keep driving it until today when it stared acting up again.

Any thoughts or ideas on what could be happening??

Thank you
Stu

Re: 2003 5.7 hemi suddenly misfiring. [Re: MidPenMopar] #2552537
09/20/18 10:13 PM
09/20/18 10:13 PM
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Central NY
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GarageDodge Offline
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Sounds like a electronic throttle problem,should have stored codes.Is the etc light on, looks like a lighting bolt in the inst cluster?

Re: 2003 5.7 hemi suddenly misfiring. [Re: GarageDodge] #2552543
09/20/18 10:22 PM
09/20/18 10:22 PM
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Originally Posted By GarageDodge
Sounds like a electronic throttle problem,should have stored codes.Is the etc light on, looks like a lighting bolt in the inst cluster?


Nope no lights are on the dash, i looked for something like that right away. work

Re: 2003 5.7 hemi suddenly misfiring. [Re: MidPenMopar] #2552552
09/20/18 10:32 PM
09/20/18 10:32 PM
Joined: Feb 2010
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Granite Bay CA
Kern Dog Offline
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Granite Bay CA
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?

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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Originally Posted By Frankenduster
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.

Re: 2003 5.7 hemi suddenly misfiring. [Re: MidPenMopar] #2552616
09/20/18 11:43 PM
09/20/18 11:43 PM
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mopars4ever Offline
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I have a good used throttle body off my 06 ram 5.7. If you find that is your issue I will send it to you if they are the same.

Re: 2003 5.7 hemi suddenly misfiring. [Re: MidPenMopar] #2552625
09/20/18 11:51 PM
09/20/18 11:51 PM
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IL us
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ink Offline
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I have had the same problem at 85k miles, 03, dodge ram hemi 5.7, no compression number 7 cylinder, been sitting in the drive way going on 5 years. sorry to say I hate that truck, worst money I ever spent, rant over

Re: 2003 5.7 hemi suddenly misfiring. [Re: mopars4ever] #2552668
09/21/18 01:18 AM
09/21/18 01:18 AM
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MidPenMopar Offline OP
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Whatever is making the engine malfunction it's very intermittent.
I was thinking maybe the cam position sensor?? shruggy

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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Buford, GA
I_bleed_MOPAR Offline
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Buford, GA
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. shruggy But that was on a CTD, not a Hemi.


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: 2003 5.7 hemi suddenly misfiring. [Re: MidPenMopar] #2553252
09/22/18 02:42 PM
09/22/18 02:42 PM
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South San Francisco, Ca
70sixpkrt Offline
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Throttle position sensor?
Cam position sensor?
Crank position sensor?
Bad Coil?


[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)
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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Rio Linda, CA
John_Kunkel Offline
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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
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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Buford, GA
I_bleed_MOPAR Offline
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Originally Posted By John_Kunkel
The sad truth is, without a full-range scanner, it's really hard to troubleshoot these newer cars.



Very true. iagree
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. confused 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. shocked
Apples and oranges, I know, but I never would have found it without a scan tool (and a driver wink ).


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: 2003 5.7 hemi suddenly misfiring. [Re: I_bleed_MOPAR] #2553382
09/22/18 09:45 PM
09/22/18 09:45 PM
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western PA
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mopar4ya Offline
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Sorry to say, but 03 5.7 is the worst for dropping valve seats and the rest is history. Just google it. I bought a mint 03 Ram for my son because of this. Having the shop equipment to do the repairs made it all worth while. Good luck.

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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Originally Posted By 70sixpkRT
Throttle position sensor?
Cam position sensor?
Crank position sensor?
Bad Coil?


Probably one of those?? shruggy 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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