Egr switch
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Egr switch
OK need quick answer. The egr switch is it a solenoid like the purge solenoid cause if it is I have 3 of them that have vacuum flowing through the input port/lower input with no power. Also no clicking when power is applied. What the heck. Isn't it just an on off solenoid.. Thanks Dick
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
OK so looks like it's a pulse width gizmo. Even so it doesn't look like there is an off. Gonna be a vacuum leak any way you look at it. Problem is I have egr operation too early and the van flutters just cruising on the flat. Unplug egr and runs great.
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 208
From: SoCal
There's usually at least 2 solenoids, one applies vacuum to the valve to open it up, and the other to release the vacuum when EGR is not needed. When the first solenoid is not active, it should seal the vacuum source. And yes, it is pulsed to apply more and more vacuum until the EVP sensor reports that the valve is opened enough.
So there could be a couple of things going bad; the vacuum source solenoid may not be closing completely, always applying vacuum, the EVP sensor is not working, so the valve is being opened more than it should, or the release solenoid is not working, though that's the least likely.
So there could be a couple of things going bad; the vacuum source solenoid may not be closing completely, always applying vacuum, the EVP sensor is not working, so the valve is being opened more than it should, or the release solenoid is not working, though that's the least likely.
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Thanks for the reply. I changed the sensor and put the regulator switch thing back in. Those sensors go bad all the time on aero's. I had a newer one on my parts van...
Dick
Dick
FTE Community Team
Joined: Nov 2001
Posts: 1,854
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From: Oak Harbor, Washington
Did replacing your EDPF (Exhaust Differential Pressure Feedback sensor) fix your problem? No. 3 in the diagram below:
No. 6 in the diagram below:
The reason I ask is that I have a similar surging that's pretty bad, but only every morning when the system goes from cold (open loop) to hot (closed loop). When the temp gauge gets to a certain point, the surging is bad for maybe a mile, then as it warms further the surging becomes nearly undetectable -- I can only feel it occasionally for the rest of my commute.
I've replaced the EDPF sensor, made no difference in my case.
No. 6 in the diagram below:
The reason I ask is that I have a similar surging that's pretty bad, but only every morning when the system goes from cold (open loop) to hot (closed loop). When the temp gauge gets to a certain point, the surging is bad for maybe a mile, then as it warms further the surging becomes nearly undetectable -- I can only feel it occasionally for the rest of my commute.
I've replaced the EDPF sensor, made no difference in my case.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
There is a small orifice in the EGR tube in between the 2 spigots that feed the DPFE sensor aka EGR transducer.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
FTE Community Team
Joined: Nov 2001
Posts: 1,854
Likes: 260
From: Oak Harbor, Washington
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
There is a small orifice in the EGR tube in between the 2 spigots that feed the DPFE sensor aka EGR transducer.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
Gonna look for the clog before I change the EVR that I bought...
Dick
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Thread Starter
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Did replacing your EDPF (Exhaust Differential Pressure Feedback sensor) fix your problem? No. 3 in the diagram below:
No. 6 in the diagram below:
The reason I ask is that I have a similar surging that's pretty bad, but only every morning when the system goes from cold (open loop) to hot (closed loop). When the temp gauge gets to a certain point, the surging is bad for maybe a mile, then as it warms further the surging becomes nearly undetectable -- I can only feel it occasionally for the rest of my commute.
I've replaced the EDPF sensor, made no difference in my case.
No. 6 in the diagram below:
The reason I ask is that I have a similar surging that's pretty bad, but only every morning when the system goes from cold (open loop) to hot (closed loop). When the temp gauge gets to a certain point, the surging is bad for maybe a mile, then as it warms further the surging becomes nearly undetectable -- I can only feel it occasionally for the rest of my commute.
I've replaced the EDPF sensor, made no difference in my case.
FTE Community Team
Joined: Nov 2001
Posts: 1,854
Likes: 260
From: Oak Harbor, Washington
There is a small orifice in the EGR tube in between the 2 spigots that feed the DPFE sensor aka EGR transducer.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
The orifice plugs up with carbon for numerous reasons, short distance driving etc.
Tube is NLA from FoMoCo.
Clean orifice with small diameter stiff stainless steel fishing wire and Chevron Techron Concentrate.
I replace the EGR valve and the DPFE sensor with no cure, cleaning the orifice brought mine back from bronco bucking.
FTE Community Team
Joined: Nov 2001
Posts: 1,854
Likes: 260
From: Oak Harbor, Washington
It's really not a problem on my rig, because if you recall I had the whole shebang out in 2012 to replace the EGR valve that had a vacuum leak causing a P0171, and I reassembled it using anti-sieze. It'll come right off. I still have the 30" of extensions and the flare nut crowsfoot adapter for that top nut.
Here's a blast from the past: my old EGR was sucking vacuum around the shaft seal (airflow in red path).
Here's a blast from the past: my old EGR was sucking vacuum around the shaft seal (airflow in red path).
Posting Guru
Joined: Jul 2004
Posts: 2,416
Likes: 1
From: Mitchell, SD
It's really not a problem on my rig, because if you recall I had the whole shebang out in 2012 to replace the EGR valve that had a vacuum leak causing a P0171, and I reassembled it using anti-sieze. It'll come right off. I still have the 30" of extensions and the flare nut crowsfoot adapter for that top nut.
Here's a blast from the past: my old EGR was sucking vacuum around the shaft seal (airflow in red path).
Here's a blast from the past: my old EGR was sucking vacuum around the shaft seal (airflow in red path).
For some reason, none of your photos are showing.
FTE Community Team
Joined: Nov 2001
Posts: 1,854
Likes: 260
From: Oak Harbor, Washington
My pics are hosted on my own server in my home. It restarts the httpd every four hours. And the power goes out every so often. The internet is not a reliable technology. It works . . . mostly.