I have a 2000 4.7L Durango and I just had an issue show up while I was driving on the highway the other day. The engine sounding like it was revving higher than normal. When I was back on city roads, I found the idle to be normal, but when I pressed on the gas, there was a high revving sound, like I was gunning the engine. I am handy enough to be dangerous, but my diagnostic skills need help. I took it to Firestone (they are such crooks) and had them diagnosis it. They said I needed a throttle position sensor and a throttle body cleaning. I changed the TPS myself and still need to clean the throttle body, but I thought I would have an improvement after switching out the TPS. Nothing changed and I still am having the issue. Needless to say, I think the crooks at Firestone were just trying to screw me. Hell they wanted $154 for the TPS repair, which cost me $30 for the part and 5 minutes. What a jip? Anyways, my dealings with Firestone is another issue, but I was wondering if any of the other 1st generation owners have experienced this issue and what was their fix. I was worried at first it had to do with the transmission, but I had the issue when I was in park and pressed on the gas, which I would think would rule out a transmission problem.

Lastly, I was thinking of buying the 3M fuel system tune-up system here at Amazon. Is it worth the money or should I just use the regular throttle body cleaner I bought?

 

just use w/e tb cleaner you find, they are all basically the same.

as for the TPS, that is likely the correct diagnosis based on what i am reading. however after you replace the TPS you must reset the computer otherwise it will take up to 500 miles to relearn the new sensor parameters. reset the computer by removing the negative battery cable and holding the key to start for 30 seconds then reconnect the battery, start the truck, let the idle settle in and shut it off, at this point you can restart the engine and go for a drive to see if the problem is gone, do this and get back to us.

 

+1. Very rarely itll be a faulty tps but you wont know till you reset the pcm.

 

I reset the PCM and still have the issue. I posted two videos on my youtube account to further illustrate the issue. The "Part 2" video, while shorter, I think reflects the issue better since it seems the audio is a little better, plus it starts from an idle position.

Part 1
Part 2

 

Are you sure that you are not experiencing transmission slippage?

Not to mention unexplained revving could also be an air leak but I would think that would show across the board and not just when you were driving.

 

Honestly, I have no idea. But, I have had the same issue when lightly pressing on the gas in park, which makes me think it isn't a transmission issue. However, I am just now starting to learn about working on my Durango, so I may be completely wrong.

 

For the trans check the fluid condition and check to make sure your fluid is up to level.