What does this part do ?
Laughing Gas
Joined: Feb 2005
Posts: 786
Likes: 26
I'm just guessing based on the location and general shape, but it could be the MAF (Mass Air Flow) sensor. That is one of several things that can affect idle. The IAC (Idle Air Control) valve is another. It's located on the back of the engine on my 96 351. The TPS (Throttle Position Sensor) is a third suspect. The good news is that the TPS is easy to test. Plenty of videos on the Tube. Yet another suspect is the EGR (Exhaust Gas Re-circulation) valve.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
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From: Easton,Ks
The part is the EVAP Canister Purge Solenoid.
It purges the vapor canister.
The EEC Module controls the Canister Solenoid. When the EEC Module grounds the Canister Purge Solenoid, fuel vapors collected by the carbon canister are released and burned by the engine.
It purges the vapor canister.
The EEC Module controls the Canister Solenoid. When the EEC Module grounds the Canister Purge Solenoid, fuel vapors collected by the carbon canister are released and burned by the engine.
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Freshman User
Joined: Apr 2018
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Can the EVAP system cause a rough idle condition ?
judging from the picture , it looks like it would not create a vaccume leak because it is before the butterflies on the throttle body. is this correct ?
judging from the picture , it looks like it would not create a vaccume leak because it is before the butterflies on the throttle body. is this correct ?
Fleet Owner
Joined: Aug 2005
Posts: 23,668
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From: Easton,Ks
It can cause surging.
No it would not cause a vacuum leak.
No it would not cause a vacuum leak.
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Freshman User
Joined: Apr 2018
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Well, I do have an occasional surging issue , expecially on a cold start up when the truck has sit all night.
Would simply unpluging the surge solenoid prevent this without causing any other issues ?
Would simply unpluging the surge solenoid prevent this without causing any other issues ?
Elder User
Joined: Nov 2015
Posts: 545
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From: Bedford, Va
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Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
It will cause surging if the tubing is leaking. Like a vacuum leak
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This is a possiability, My Van had dual tanks but a P.O. disconnected the front one and when he did it he cut the supply line from the front tank to some sort of a junction box mounted on the driver side frame. ( when you try to fill it , it pours on the ground ) I cant get up there enough to see what hoses are left or to verify if any hoses from the EVAC system go to it but I would suspect that one would go to the tank and suck air that way .
Is there any where on line where I can see a diagram of the EVAC system for my 1990 e-350 van with dual tanks ?
Is there any where on line where I can see a diagram of the EVAC system for my 1990 e-350 van with dual tanks ?
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