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  #1  
Old 11-08-2009, 12:56 AM
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Default Engine or transmission surge

My 2001 Ram 1500, 5.2L runs like a top, however it's starting to develop what I call a "surge" at highway speeds. It's like it's trying to go into another gear for just few seconds as the RPM will jump up, the engine speeds up and then it quiets down for a minute or so and then it does it all over again. I drive 17 miles to work each way and I really notice it when I running between 55 and 70 mph. Any ideas?
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Old 11-13-2009, 09:56 AM
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have you hooked up to a code reader to see if its throwing codes? there's a guy i go to school with that has a 4.7 in a durango and it surges while it idles and the code that it was throwing that either the throttle position sensor voltage was up. the code reader said it was "disagreeing" . we checked it out and it looked like one of the holes the connector pins goes in was a little burned. might want to take a look at that, hope it helps
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Old 12-02-2009, 09:08 AM
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Had a 2001 doing the same thing....after a while it will give you a code for tranny problem. The transmission was actually slipping some at highway speeds. There is a TSB for a solenoid valve and orifice plate modification that is suppose to address this issue before it causes too much damage. Helped mine for a while, but the tranny did start to slip again eventually, and the trouble light wasn't far behind. I just left the overdrive off while nursing it unitl I could repalce tranny. I have since sold the truck, but the new tranny ran great for the remaining 10k miles or so.
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Old 12-02-2009, 10:35 AM
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TSB 18-006-02 Rev. C addresses the issue you're having but it doesn't involve any parts replacement. If your trans has some mileage on it, it may be best to look into a rebuild. The 42 series trannys build in the early 2000's were notorious for somewhat short lifespans. If you dedcide to have the flash performed in the above TSB, ask the tech to check your clutch volume indexes while they're at it. You may even want to spring for a line pressure test.
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Old 12-02-2009, 05:25 PM
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Yeah sounds like tranny issues . Hows the fluid look and smell ?
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Old 12-11-2009, 02:20 PM
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Hey - before you start spending money on your tranny, spend about $35 bucks to replace your Throttle Position Sensor (TPS). I had that same issue with my 2001 and thought it was my transmission slipping. Was thrilled to death when I fixed the issue with $35 bucks and 5 minutes.
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Old 12-13-2009, 12:29 AM
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Check your brake light switch adjustment. If your brake lights come on it will unlock the converter. I've seen a few rams with the brake lights on while driving (mine was one, Friend was following me and asked why I kept hitting the brakes...I wasn't). To feel the effect while your driving, just tap the brake petal while holding steady on the throttle, the converter will unlock then lock up again. See if it feels like that......
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Old 12-13-2009, 03:19 AM
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Does it idle badly in neutral while revving?? I had a Nissan pickup with a throttle position sensor go bad like the others were saying. When in neutral, you could rev it up and when it hit about 2k rpm, it would just cut out b/w 1k-2k, up and down while holding the gas steady. Also, it was a 5-speed. Pulling out was tricky until I got it fixed. You had to hold the rpm's above 2000... let's just say it wasn't easy in a 4-cyl. It was weak enough to begin with, let alone trying to keep it from bogging down the least bit..shewww...
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Old 12-13-2009, 12:56 PM
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It would be great if there were any codes to check into.

Throttle position sensor or transmission codes would be my first guess but it could also be an EGR valve that's partially plugged or a fuel system/filter problem as well but I would not check those first.
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