EGR PROBLEM
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EGR PROBLEM
I have an 1980 Ford F-150 with an inline 300. I just installed a new egr valve on. Here is the problem:
After the engine warms up with everything connected, the engine starts to cut out and die while idling. This is due to the VCV opening up and allowing vacuum to the EGR. My question is why is this happening? The EGR is not suppose to open up during idle.
If you can help me solve this problem as soon as possible, i would really appreciate it. Thanks
After the engine warms up with everything connected, the engine starts to cut out and die while idling. This is due to the VCV opening up and allowing vacuum to the EGR. My question is why is this happening? The EGR is not suppose to open up during idle.
If you can help me solve this problem as soon as possible, i would really appreciate it. Thanks
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The very start of the EGR system is ported vacuum, which is above the throttle plates. There is zero ported vacuum at idle, making it ideal for the EGR system. If your EGR valve is receiving vacuum at idle, then it's hooked up to manifold vacuum upstream of the ported vacuum switch. It should be moved to ported vacuum instead.
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Thank you. Right now my egr is hooked up to the full time port, and every time the VCV opens it dies. On my diagram the egr and everything else is connected to a port "E". What does port E represent? I will upload my diagram when I get home today.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I'm not sure what "E" stands for - the factory vacuum diagrams are very cryptic. I can say for sure, however, that the EGR valve should be sourced from ported vacuum (through the ported vacuum switch of course) and not manifold vacuum. When the engine is warm and the ported vacuum switch is open, the EGR valve should be closed at idle. It should only open once the throttle plates begin to open and ported vacuum rises. As the throttle plates open, ported vacuum tracks manifold vacuum. The two drop off as the throttle plates open even wider.
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Bowers25
1987 - 1996 F150 & Larger F-Series Trucks
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May 26, 2016 08:11 AM
