Vacuum line? 2005 4.7L 1500

[bugnutz]

Sorry, I was in somebody else's PCM thread and I didn't mean to hijack that. I figured I best make my own.

The last advice I got was to disconnect and recharge the battery and reset. I have already done that and I still had P0633. I can do it again, though. I ordered a scanner so maybe I can tell better what is going on next week.

In the meantime I was nosing around this truck because it is new to me, and would you look at what I found? What is this? I guess this explains the plastic burning smell I couldn't identify. I had already changed the crankshaft position sensor, so I was looking for the camshaft position sensor and found this. Tubes? They were behind, on top, close to the firewall. I didn't even see them when I cleaned the throttle body and the IAC, and I didn't disconnect them. One is melted and one was just disconnected. I have been smelling plastic burning since before the surging, hunting, stalling thing started.

 

[bugnutz]

This is the other end of those, going into that small cannister by the fusebox in the front of the engine.

 

[Redtruck-VA]

I'm not familiar with the 4.7 but that sounds like the plastic line for the purge valve.

 

[bugnutz]

The plastic sleeve was also melted but more like something corrosive had dripped on it, probably PS/ATF.

 

[bugnutz]

I downloaded the 2005 RAM factory service manual, but some of the drawings I am looking at in there are difficult.

 

[Redtruck-VA]

I would follow the hoses. I think you will find a purge valve up in the area near the IPM. Then there will be a pipe going to the cannister and then back to the emmission stuff in front of the gas tank..

 

[bugnutz]

I would follow the hoses. I think you will find a purge valve up in the area near the IPM. Then there will be a pipe going to the cannister and then back to the emmission stuff in front of the gas tank..

Yes, that is the purge valve they are still attached to. The other end of both those tubes is where I found them disconnected and melted, by the firewall. I don't know where they go to. I am looking for a routing diagram for the vacuum supply hoses. I haven't found that in this service manual yet, but still looking. I read there was also a TSB to re-route the vacuum tubes for this very thing happening to them, but I haven't found that one yet either. Thanks.

 

[bugnutz]

No diagram, but getting closer to the answer, maybe. I have both of them I don't know quite where they go or reconnect to. One was disconnected and the other is melted.

https://www.ramforum.com/threads/melted-evap-tube-help.71799/

 

[bugnutz]

I found the TSB but it is more just about rerouting the PCV, not the whole evap tubing assembly.

http://dodgeram.info/tsb/2006/25-001-06.htm

 

[bugnutz]

13

Vacuum Harness
53032054AC
4.7 LITER, 2005
Discontinued

14

Harness
52121115AB
4.7 LITER, 2005, PURGE SOLENOID
Discontinued

14

Harness
52110270AC
4.7 LITER, 2005, VAPOR CANISTER
Discontinued

 

[bugnutz]

Does nobody know what they connect to? It's raining so I won't be able to crawl around under the truck today. I cannot find any unoccupied connections under the hood, though. I think if I have to replace the whole thing, it is 3/8" tubing the same as windshield washer tubing.

 

[Orange whip]

Sorry, I was in somebody else's PCM thread and I didn't mean to hijack that. I figured I best make my own.

The last advice I got was to disconnect and recharge the battery and reset. I have already done that and I still had P0633. I can do it again, though. I ordered a scanner so maybe I can tell better what is going on next week.

In the meantime I was nosing around this truck because it is new to me, and would you look at what I found? What is this? I guess this explains the plastic burning smell I couldn't identify. I had already changed the crankshaft position sensor, so I was looking for the camshaft position sensor and found this. Tubes? They were behind, on top, close to the firewall. I didn't even see them when I cleaned the throttle body and the IAC, and I didn't disconnect them. One is melted and one was just disconnected. I have been smelling plastic burning since before the surging, hunting, stalling thing started.

View attachment 183184

Sorry, I was in somebody else's PCM thread and I didn't mean to hijack that. I figured I best make my own.

The last advice I got was to disconnect and recharge the battery and reset. I have already done that and I still had P0633. I can do it again, though. I ordered a scanner so maybe I can tell better what is going on next week.

In the meantime I was nosing around this truck because it is new to me, and would you look at what I found? What is this? I guess this explains the plastic burning smell I couldn't identify. I had already changed the crankshaft position sensor, so I was looking for the camshaft position sensor and found this. Tubes? They were behind, on top, close to the firewall. I didn't even see them when I cleaned the throttle body and the IAC, and I didn't disconnect them. One is melted and one was just disconnected. I have been smelling plastic burning since before the surging, hunting, stalling thing started.

View attachment 183184

Did you ever find out what this hose is and does? I found it disconnected on my 4.7 firewall ---

 

[Goliat6288]

if its the same hoses, the ones that connect to the purge valve, i know one goes back to the fuel tank. dont remember where the other one goes but i can look into it in a few

 

[Goliat6288]

one goes to the firewall and down and back to the fuel tank, the other one goes to the throttle body.