Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Search Auto Parts

2007 Ram high reving and hard shift down


  Email This Post



tessamm09
Novice

Jun 23, 2015, 6:58 AM

Post #1 of 10 (1461 views)
post icon 2007 Ram high reving and hard shift down Sign In

I have a 2007 dodge ram 1500, 135,000miles.
Main problem...when I initially turn the truck it revs up and down between 1,000 rpms to 1,500rpms and when I start driving it'll jump up to 2500rpms and the shift really hard back down below 2000. Then it will continually do this the whole time. Here lately when I push on the brake to slow down it'll shift down really hard or it does it when coming to gradual stop. Another issue, if I have to sit to long like say in a drive-thru it'll start acting like its going to shut down, so I turn it off and then back on after a min and then it'll start back up just fine. I do have a p0068 code coming up.


Any suggestions? We changed the transmission fluid and changed out the 02 sensors.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 23, 2015, 7:41 AM

Post #2 of 10 (1453 views)
Re: 2007 Ram high reving and hard shift down Sign In

Engine size? 2 or 4 wd?

Did you replace the o2 sensors with factory originals from the dealer? Was it doing this before you replaced the sensors?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


tessamm09
Novice

Jun 23, 2015, 7:46 AM

Post #3 of 10 (1450 views)
Re: 2007 Ram high reving and hard shift down Sign In

It's a 4.7liter, 2wd.
No, I went to autozone and bought them, and yes it was doing this before hand.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 23, 2015, 4:15 PM

Post #4 of 10 (1430 views)
Re: 2007 Ram high reving and hard shift down Sign In

You should check for vacuum leaks, make sure the throttle moves easy, and verify the throttle bore isn't carboned up.

The P0068 is a MAP and TPS correlation code. Basically the MAP and the TPS inputs don't agree with each other for some reason. High manifold pressure from a vacuum leak can cause this type of code to set and also cause the PCM to go into high air flow protection limiting mode, so it is important to be sure you don't have a vacuum leak before moving on to the next step.


Just curious, but what was the reason for replacing the oxygen sensors?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 23, 2015, 4:19 PM)


gsferraro
Veteran

Jun 24, 2015, 3:43 AM

Post #5 of 10 (1415 views)
Re: 2007 Ram high reving and hard shift down Sign In

Hello,
If you can post the vin, i can see what transmission is in your truck, there are a few choices. Gary


tessamm09
Novice

Jun 26, 2015, 4:30 PM

Post #6 of 10 (1395 views)
Re: 2007 Ram high reving and hard shift down Sign In

We had another code that was coming on and changing the O2 sensors made it go away. Today it was running like crap with high revving and I got home turned it off. Went to leave an hr later and now it won't turn over at all. Maybe it's not a transmission problem?


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 26, 2015, 4:33 PM

Post #7 of 10 (1394 views)
Re: 2007 Ram high reving and hard shift down Sign In

Maybe not. Now it won't crank? Is the battery fully charged and tests good? Maybe when you get it running again, check the charging system voltage. Modules will act funny if the charging voltage is too high or there is excessive alternator ripple.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 26, 2015, 4:35 PM)


tessamm09
Novice

Jun 26, 2015, 4:37 PM

Post #8 of 10 (1389 views)
Re: 2007 Ram high reving and hard shift down Sign In

The battery gauge wasn't quite to the middle line so I tried jumping the battery and it still wouldn't turn over. I'll have to take it to get tested tomorrow.


tessamm09
Novice

Jun 28, 2015, 3:49 PM

Post #9 of 10 (1373 views)
Re: 2007 Ram high reving and hard shift down Sign In

Ok so I have changed my battery and starter and it still won't turn over. Tried putting it in N and that didn't work, tried putting it in reverse and then back in park, nothing. I'm not sure what else it could be.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 28, 2015, 6:50 PM

Post #10 of 10 (1369 views)
Re: 2007 Ram high reving and hard shift down Sign In

This is where it starts to get a little complex. The starting circuit on this isn't like your normal starting circuit. There are three computer modules that are involved that will allow power to the starter solenoid or not. The only way your going to be able to trouble shoot this, unless you find something obvious wrong, is with a volt meter, wiring diagram, and possibly an enhanced scan tool. You also need to have knowledge of how to troubleshoot electrical circuits using voltage drop testing.

The PCM tells the TIPM (totally integrated power module) to energize the starter relay to allow current to flow to the starter solenoid. PCM gets start request from the ignition switch. The 3rd module is the sentry key module (immobilizer).





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 28, 2015, 6:51 PM)






  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap