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-   -   Rough idle when cold. (http://www.ramforumz.com/showthread.php?t=125804)

solohopper 11-11-2012 12:54 PM

Rough idle when cold.
 
I bought a 2006 1500 with the 5.7 Hemi and 125,000 miles.

When I start the truck in the mornings or when its cold, it has an EXTREMELY rough idle. It will run rough until it warms up. I will then hear a CLICK and the engine will run smooth.
I have taken it to two different mechanics and they have come up short. They say that cylinder one is misfiring but they don't know why. New plugs, swapped coil and they both think the injector is fine since it would run bad all the time if it was the injector.

So now I come to all of you in hopes that you can tell me what to try next. I have no clue where to start.

Thanks in advance for your time and help.

doctorg 11-12-2012 10:30 PM

check out the iac for proper operation.

solohopper 09-16-2013 01:39 AM

2 Attachment(s)
Its been a while since I have updated this thread. I have not been driving the truck as much this summer. I got a company truck so the dodge was out of sight out of mind.

But I finally took off the intake manifold to get a better look at what was going on. Here is what I found.

All of the ports that lead to the valves are oily except the first one on the drivers side. I have added a couple of pictures so you can see what I am looking at. I honestly have no clue of which way it should look. But the code i was getting before said I was having a problem with cylinder #1. Now I can see it is different than the others. The first picture is Cylinder #1. The second picture is #3. Any suggestions, tips, or ideas?

solohopper 09-25-2013 09:00 AM

:doh:

Back to the drawing board!!!

I pulled the intake, cleaned it all up, replace all the spark plugs, replaced injector #1, put it all back together and the SAME thing continues to happen. AND IT GOT WORSE!!!!:4-dontknow:

Not to mention I got a red lighting bolt and loss of power!!!

I have code p0301 still showing up.

UGH SO FRUSTRATING!!

So here is what happened once I started it. It ran rough right of the bat. Threw a low fuel pressure code which cleared itself after I shut it down and started it back up. Initially, it ran rough and it smoothed out and ran great. Good throttle response and plenty of power.

So i let it sit overnight and started it the next afternoon. SAME THING HAPPENED. It started just fine and ran rough just like always. it Immediately threw the P0301 code. and just like always, once it got warmed up, it ran just fine. (I could feel it running a lot smoother now after it warms up, so that was a plus.)

But then something worse happened. I was driving along and the red lightning bolt started flashing and i had no power. If I stepped on the accelerator, it would just bog down. Erratic idle when stopped and even shut off on me. Once it shut off and I started it back on. the lightning bolt was gone and I made it home. I had this lightning bolt pop up before but only for a couple of seconds and then it went away.

So I am back at square one with more problems.

HELP!!!!!

bparsel 09-25-2013 02:33 PM

Did you unhook your battery and let the computer reset when you made the injector changes and cleaned the throttle body etc?

Typically a rough idle can only be a few things.

Plugs, TPS, MAF, IAC, Inject, or Coil Pack. A bad Oxygen sensor can trigger the engine to over adjust and cause a rough idle as well, but the chances of a bad sensor without throwing a check engine light and code would be really rare.

solohopper 09-25-2013 05:30 PM

Quote:

Originally Posted by bparsel (Post 1207768)
Did you unhook your battery and let the computer reset when you made the injector changes and cleaned the throttle body etc?

Typically a rough idle can only be a few things.

Plugs, TPS, MAF, IAC, Inject, or Coil Pack. A bad Oxygen sensor can trigger the engine to over adjust and cause a rough idle as well, but the chances of a bad sensor without throwing a check engine light and code would be really rare.

Yes I unhooked the battery for about a week while i did the work. I replaced the MAF, IAC, injector, plugs and swapped coil packs. There is no TPS on a hemi and I too would think an O2 sensor would through a code. :4-dontknow:

bparsel 09-25-2013 05:46 PM

Quote:

Originally Posted by solohopper (Post 1207834)
There is no TPS on a hemi and I too would think an O2 sensor would through a code. :4-dontknow:


Correct, sorry I was just throwing out "Typicals"


Do you know anybody else with a hemi ram? Try swapping Throttle Bodies for the heck of it to see if there is a difference?

solohopper 09-25-2013 06:34 PM

I don't know anyone else with a ram like mine. :(

chefred112 09-26-2013 02:50 AM

lightning bolt usually refers to throttle body and it going into limp mode (to prevent any damage to get worst)...maybe try grounding the tb (incase the signal is not clean)... you did pull the tb and cleaned it right? also check pcv, either clean or replace.

solohopper 09-26-2013 09:01 AM

Quote:

Originally Posted by chefred112 (Post 1208184)
lightning bolt usually refers to throttle body and it going into limp mode (to prevent any damage to get worst)...maybe try grounding the tb (incase the signal is not clean)... you did pull the tb and cleaned it right? also check pcv, either clean or replace.

I think I found the problem causing the lightning bolt. The clip holding the tube that goes to the PCV valve had come off and the tube was not inserted properly into the intake. :doh:


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