Vapor managing valve
Thread Starter
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Member
Joined: Sep 2005
Posts: 40
Likes: 0
From: Kristiansand, Norway
Vapor managing valve
Hi.
Still struggeling with the rough idle/stalling problem when warm.
Idles fine when cold, and runs great on highway.
No vacuum leaks, no broken hoses..... New maf sensor.
I read a thread about the Vapor managing valve
could cause this problem.
If i'm right, this valve should open when the engine is warm, allowing vapors from the gastank to enter the intake.
Which means that there will be 12v power on the electrical circuit to open the valve, and i should be able to blow through it.
If it's not opening, the idle will be crapy, and discard the valve for a new one!!
Any comments on this?
Still struggeling with the rough idle/stalling problem when warm.
Idles fine when cold, and runs great on highway.
No vacuum leaks, no broken hoses..... New maf sensor.
I read a thread about the Vapor managing valve
could cause this problem.
If i'm right, this valve should open when the engine is warm, allowing vapors from the gastank to enter the intake.
Which means that there will be 12v power on the electrical circuit to open the valve, and i should be able to blow through it.
If it's not opening, the idle will be crapy, and discard the valve for a new one!!
Any comments on this?
Senior Member
Joined: Oct 2002
Posts: 7,295
Likes: 125
From: St. Louis (Out in the woods)
The VMV is part of the evaporative emissions system. It always has battery power (with ignition on) on it and is activated by the PCM by grounding one lead only during the time that the PCM's programming has specified.
It is probably NOT your problem.
Sounds like a typical vacuum leak . Any MIL or fault codes?
Which engine and transmission are in your 2004?
It is probably NOT your problem.
Sounds like a typical vacuum leak . Any MIL or fault codes?
Which engine and transmission are in your 2004?
Thread Starter
|
Member
Joined: Sep 2005
Posts: 40
Likes: 0
From: Kristiansand, Norway
Vapor managing valve
Thanks for your answer. 
Got the P0171 and P0174 lean codes, wich could be vacuum leak.
However, i can not see where the leaks could be, as i have had all things apart and checked.
I also looked at a hose behind the intake on the passeneger side, but it's ok. (as far as i can see)
Engine is 5,4 3v and auto. 4X4.
Got the P0171 and P0174 lean codes, wich could be vacuum leak.
However, i can not see where the leaks could be, as i have had all things apart and checked.
I also looked at a hose behind the intake on the passeneger side, but it's ok. (as far as i can see)
Engine is 5,4 3v and auto. 4X4.