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Old 07-11-2009, 09:30 PM
mennor28 mennor28 is offline
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Angry Engine Loping between 1500 and 2500 rpm

Hi, I have a question I am hoping that someone can answer. I got a 2002 Dodge Ram 1500 Sport QuadCab 5.9L/45RFE. It has a constant lope between 1500 and 2800 rpm, it is the worst around 2000 rpm. There is no huge loss in power, but some, and the gas mileage is terrible, maybe 11 mpg on the highway at best. Its not loping at idle, only at driving speeds and it is really noticable when in OD around 2000 rpm going up a grade/hill. I am thinking TPS sensor for some reason. However, I have noticed that under 2500 rpm this thing is gutless lately, (more so than the usual 5.9L is) Could my problem possibly be the torque converter? maybe it is starting to go? I'm not sure the stall speed on it, but its probably around what 2000-2500 rpm? Any advice on this problem would be greatly appreciated. Thanks. Also does anyone know a place i can get a lower stall rpm converter, maybe something like a 1000 to 1500 rpm? Thanks.
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Old 07-14-2009, 09:25 AM
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boy thats a good question mennor.......my first thought was a vaccum line is frade or cracked or came off the intake. any of this in a vaccum line will cause an engine to surge...but then again so will other parts that hav gone bad.....

then thinking intake i thought of your air intake sensor is it unpluged.....
or maybe it needs cleaned , if dirt builds up on it then it will read wrong and just start dumping fuel or slowing it down, thus causing a surge in engine rpm.
hmmmm.......

im curious tho to wut you find out , keep us posted
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Old 07-14-2009, 10:23 AM
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I wondered about the intake sensor myself, great recommendation DesertDog
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Old 07-14-2009, 11:08 AM
ljonesj ljonesj is offline
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egr and the idle air control motors can cause certain issues that can be confusing
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Old 07-14-2009, 11:58 AM
mennor28 mennor28 is offline
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Default I'll check on those and let you know

Thanks for the replies, I did change the TPS sensor and the PCV valve this weekend. It did make a improvement in the lope, but, it did not solve the problem completely. The intake sensor does make sense... I think tommarow I am going to remove the throttle body and clean it, check for intake seal leaks and test the egr valve and check for vaccum leaks, and if all that fails... I'll run to the parts store and get a intake sensor and throw that on. Another question however, does anyone know where I can get a lower stall speed torque converter? Dealerships and local parts stores are no help, and i keep getting the "gas mileage will suffer" answer from them... yeah it gets around 12mpg at best anyway, would rather have more lower end torque, only converters I have found so far are stock replacement one with i think a 2500rpm stall speed, my guess from driving it, none of the stores list the stall speed, they just say "high" or "stock" I am also wondering if I do happen to find one, will my truck run correctly with the lower stall speed converter in it? Thanks again for everyones replies... I'll keep you posted
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Old 07-17-2009, 09:25 AM
mennor28 mennor28 is offline
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Default Fixed it

Wanted to post and let you know that it was the air charge temp sensor in the manifold. Not sure what it was doing exactly, but I changed it and it worked. No more surge, lope. Thanks everyone for the input and advice.
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