Question about 2001 Dodge Ram 2500 Truck
While driving at a cruse speed the engine RPM drops in half,still runs even,but lacks power.let up on the throttle, then mash down again and it usually picks back up again.The engine light is not on and does work. This problem is not an every day occurrence.some days it doesn't do it at all,some days its bad.lift pump has been changed,with no difference.I am curious about the throttle positioner or the module on the inj. pump.
Have you ever had the mechanical lift pump go out on these vehicles? If the fuel pressure drops under 5psi on the VP44 injection pump for any length of time, the diaphrams get weakened and especailly when the warmer seasons come back, you will notice fuel delivery problems. A new/rebuilt pressure pump is required! Sorry for the bad news, if indeed this is the case. One solution/prevention is to replace the lift pump with the upgraded Mopar (goes into the tank now) or an aftermarket pump like the FASS pump or the like. Anyone that has the VP44 injection pump should upgrade ASAP! This is a common problem on the OEM mechanical lift pump on this particular run of Rams. Need to do it before you run up a costly repair bill later on down the road. The stock/OEM lift pumps WILL go out, sometimes as little as 12k miles, sometimes 50k miles.....I had 3 go out, Stock at 43k, Mopar replacement lasted 31k and the 3rd (aftermarket OEM) lasted 14k. I had a fuel pressure guage installed a very long time ago to alert me of failures. The 4th go around I installed the FASS and now it maintains 21 to 27psi even with chip mods switched to extreme! I am still on original VP44 pump (knock on wood!)
Good Luck!
Posted on Dec 15, 2008
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Sounds like I have a similar problem, only RPMs on guage are not dropping all the time. I have noticed on the bad days when you take foot off throttle, hesitation stops which makes me think it may be a sensor in the throttle itself, fuel pump has been replaced as well as injector pump. Filter doesn't seem to be the issue either. Hope someone knows what the problem is, mechanics in my area don't seem to have any answers.
It was helpful still looking for more answers. Lift pump has been replaced with no change.
I have replaced the lift pump and nothing has changed. I was thinking it might be the throttle position sensor ?? Any more ideas??
I have a 2001 dodge ram that has the same prob. MIne has 178,000 miles on it and had done the hesitation for quite some time now. Hook the code machine to it for no answer! The enguine goes flat with no power but turn the key off and right back on and you got power! Once the truck warms up it seems to be fine. Also I have noticed that with more than a half a tank of fuel the problem does not occur as much. I want help and I know you guys do as well !--Marc Savoy , Texas
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