engine wont stay running or has low idle need help ?!?!?

Mikeyn23 · Nov 1, 2016

my sister has a 2003 dodge ram 2500 5.7 with 148k on it just had a tune up about a month ago and just had a new trans install 2 weeks ago 4th gear was gone so she got it replaced had it back for about 2 weeks and now the trucks running funny throwing random codes had a code for the o2 sensors so we replaced those then we had a randomp multiple misfire check all the wires and plugs put in new coil packs everythings good but still getting that code but the big problem is when its running the rpms go from like 400-1500 up and down boggin out then coming back on I noticed this happens when its in park and neutral or going slow in drive or reverse but you could drive the truck fine does really good burnouts just cant stop at lights or it turns off any idea what it could be I even replaced the maf sensor and cleaned the whole throttle body and still go nothing ? and no other codes are coming up on the scanner need help don't know what else to do ? can it be something wrong with the new tranny ?

bhonshell42 · Nov 2, 2016

Mikeyn23 said:
my sister has a 2003 dodge ram 2500 5.7 with 148k on it just had a tune up about a month ago and just had a new trans install 2 weeks ago 4th gear was gone so she got it replaced had it back for about 2 weeks and now the trucks running funny throwing random codes had a code for the o2 sensors so we replaced those then we had a randomp multiple misfire check all the wires and plugs put in new coil packs everythings good but still getting that code but the big problem is when its running the rpms go from like 400-1500 up and down boggin out then coming back on I noticed this happens when its in park and neutral or going slow in drive or reverse but you could drive the truck fine does really good burnouts just cant stop at lights or it turns off any idea what it could be I even replaced the maf sensor and cleaned the whole throttle body and still go nothing ? and no other codes are coming up on the scanner need help don't know what else to do ? can it be something wrong with the new tranny ?

I suggest pulling the valve covers and checking each valve spring. Even a slight bend can cause issues with idling and throwing codes. I have a 2004 1500 with the hemi. If you do have a bad valve spring, check the national recall from Dodge for perhaps a cheap remedy. Hope this helps

Sent from my SM-T550 using Tapatalk

Mikeyn23 · Nov 2, 2016

Okay thanks I'll be doing that later then

sean_chot · Dec 11, 2016

Did you ever find a solution. My 03 1500 5.7 does the exact same thing. I've had the valve covers pulled and there was nothing wrong with any of the springs.

Sent from my iPhone using Tapatalk

Jimbo82 · Dec 19, 2016

Mine would stall when slowing down abruptly, or turning. I added some Marvel's Mystery Oil (8 oz./10 gal. gas) and the problem stopped. Not sure if it was because of dirty injectors or what, but the problem of stalling stopped. It's cheap and easy, and worth a try. Use 16 ounces per fill-up. You can purchase it at Dollar General for under $4 or any parts store carries it. It's an old remedy to clean carbs/injectors, or add to oil to clean lifters, and sticky valves.

Ian_Olivas · Dec 29, 2016

Mikeyn23 said:
my sister has a 2003 dodge ram 2500 5.7 with 148k on it just had a tune up about a month ago and just had a new trans install 2 weeks ago 4th gear was gone so she got it replaced had it back for about 2 weeks and now the trucks running funny throwing random codes had a code for the o2 sensors so we replaced those then we had a randomp multiple misfire check all the wires and plugs put in new coil packs everythings good but still getting that code but the big problem is when its running the rpms go from like 400-1500 up and down boggin out then coming back on I noticed this happens when its in park and neutral or going slow in drive or reverse but you could drive the truck fine does really good burnouts just cant stop at lights or it turns off any idea what it could be I even replaced the maf sensor and cleaned the whole throttle body and still go nothing ? and no other codes are coming up on the scanner need help don't know what else to do ? can it be something wrong with the new tranny ?

When my rpms did that and the truck died while driving it turned out to be my fuel pump going out, I found out for sure because one day after it died while I was driving it didn't turn on and the fuse for the pump blew

Ian_Olivas · Dec 29, 2016

If the engine is shutting off when you slow down or stop it sounds like a fuel issue to where enough fuel isn't hitting the engine.

engine wont stay running or has low idle need help ?!?!?

Mikeyn23

Member

bhonshell42

Junior Member

Mikeyn23

Member

sean_chot

Junior Member

Jimbo82

Junior Member

Ian_Olivas

Senior Member

Ian_Olivas

Senior Member

Similar threads

Latest posts

Members online

Forum statistics

Share this page