Question about 2004 Dodge Ram 1500

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2003 dodge ram 1500 hemi 4x4, no power or throttle response!

Ok, I have had a nagging problem for over a year with my 2003 4x4 dodge ram hemi 1500 (70K miles). The truck feels like it is starving for air or fuel. It has no torque and horrible throttle response. It takes a full throttle stab to get it to downshift and accelerate while driving. Even under full acceleration it will only rev as high as 5K rpm and it labors to go over 70 miles per hour. I have taken the truck to 2 seperate dealerships and no one can find the problem. Ive replaced the cat & muffler with high flow versions, both O2 sensors, plugs, inject cleaned, checked fuel presure (47-50 PSI), checked my grounds, etc. There are no codes now and the only ones ive had in the past were O2 sensors and evap system (very intermitant). The probelm occured suddenly while driving down a rough road. I thought it was a colapsed cat or plugged fuel filter but both have been addressed. I guess theres only electrical and induction/throttle issues left and I dont know where to begin to look. Ive heard of some guys having issues with IAC's and TP sensors but i figured those would throw a code. Im all out of ideas and any direction/help would be most appreciated. Thanks in advance.

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  • Bruce Hathcock May 11, 2010

    Mechanics over look two items, one is the EGR Valve and the other is evap canister purge valve. Check those to see if they are working, the EGR valve will not close giving you inert gas cutting H.P. Do a voltage test on the IAC get the base settings and do a manual check with a vacuum pump of the maf or map sensor, forget what it's called on Dodge. and if it's working then I would pull the tank anyway and look at the fuel sock, See if it's bad even if you have good pressuer you do not know the volume comming out, you could buy a mesuring cup and unhook the fuel line and do a volume check to see if you have enought volume or not. Before pulling the tank. Do you have the alldata Specks avalible to you? if not get them and look up the base voltages and go hunting. If you need more help post here and I will see what I can find out. I had one come in the other day and it was a gutless wonder they guy ownned it for 5 years and it drove that way all the time. I checked everything and so did the dealer, so I finally decided to take the timing cove off and found that the cam was off by 3 teeth on passenger gear, Not saying thats your problem but after I changed it for him it ran like a hot rod, different rig though. If yo are will to do the checks I would be willging to help you with this but you have to have the alldata info to do it. I think the new Dodges are same voltages as the rest of the cars but if you get the specks and test it, it is the only way of saving you money but will cost you some time. I had one came in to my shop and the car would run 30 40 miles and then all of a sudden would stop, the fuel pump had been changed and the injectors had been changed engine was rebuilt. Still had a problem, I found out it was the fuel pump connecter and it was just a guess, Had it to many shops before mine and took me a week of testing and figureing out what was the problem. Also is it Automatic? you could have a bad converter, the lockup clutch could be defective, and not throwing a code means it's mechanical most of the time. By that I mean spark, fuel, compression,timing basic engine functions. let me know what ya have in her.

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I also have an '03 Ram 1500 with the Hemi, and I too noticed that the throttle system definitely sucks. The issue lies with Chrysler opting for speed density instead of mass air flow, which is what the Hemi should have. I landed an a chatroom that had a procedure to try to fix the throttle response. Simple procedure.
1. turn the Ram on, but don't start.
2. wait 7 -10 seconds for onboard diagnostics to cycle and finish.
3. press the accelerater to the floor, using moderate leg speed and then let up.
4. shut Ram off, wait 10 seconds.
5. start up

After using this procedure, my Ram finally accelerated like a Hemi Ram should. The chatroom said that for some reason, this won't work on every Hemi Ram, but since you don't hook up into the computer, it's worth a shot.
Best of luck!

Posted on Oct 08, 2009

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If your fuel pressure is ok, and since you already replaced other sensors,I would go after the catytic converter on the exhaust. I had the same truck and mine was 1/3 or more clogged.Depending on your highway laws, you might be able to just gut the inside of it,(do not remove the whole thing,just cut a hatch in it and beat out the charcoal pieces with a hammer and chisel, then weld the hatch you made back up. or if your laws are sticky,replace the unit itself. i bought my truck used with 40k on it and it was always a bit sluggish, anoce i hit about 55k i had no power,i had to down shift to 2nd to climb a hill with my foot buried to the floor. once i removed the cat, it will now smoke the tires in 1st and 2nd, and let out a small chirp in 3rd.huge difference.

Posted on Oct 10, 2009

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SOURCE: 2003dodge ram hemi 1500, no power, torque, or throttle response

AS far as IAC goes, you would probably experience stalling at lights, on turns , anytime engine under load like AC on at stop. TP sensor? Maybe, but is easy to check with an ohm meter. I'm sure you have checked all brakes for possibly holding on slightly. You have checked throttle pedal & linkage to make sure pedal down all the way, is opening throttle all the way? Does it feel at all like it's holding back, or just starving? Any good tranny shop that could check torque converter for proper operation in your area? One other idea would be to join free, at (allpar.com) and post there, as that would be a spot where all or a lot of guys with same vehicle may be able to shed some light on it for you.

Posted on Jul 24, 2009

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