EGR
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Freshman User
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EGR
Hello. I have a question about EGR. My truck is a 77 f150 automatic 4x4 with a 351m engine. Motorcraft 2150 carburetor. My engine has always made a noise like a clattering sound to me at all rpms. I noticed the other day that someone had removed the vacuum line going to the egr valve and capped it off sometime before I owned it. From what I understand, the engine has to be tuned differently if the egr is disabled. I don't know if this has been done. Could this be the cause of the noise I hear? It's difficult to describe. Could be preignition im not really sure what that sounds like.
if the tuning specs are for it to have egr then I'd rather just make the egr function again like it should. So there's a port in the cylinder heads that exhaust goes through, passes through the intake and into that spacer under the carb right? I also noticed when I had my carb off that the underneath side of that spacer looked really burnt to me. Any help is appreciated
if the tuning specs are for it to have egr then I'd rather just make the egr function again like it should. So there's a port in the cylinder heads that exhaust goes through, passes through the intake and into that spacer under the carb right? I also noticed when I had my carb off that the underneath side of that spacer looked really burnt to me. Any help is appreciated
Logistics Pro
Joined: Jul 2005
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Your route of exhaust gas sounds right. That's how a SBF is anyway - at least before the early mid '90s. You can probably throw a new EGR valve on there and plumb up the controls, although it's going to need to go through a Temperature Controlled Vacuum Switch, to be the way Henry built it.
Cargo Master
Joined: Mar 2002
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From: W (BY GOD) V
The actual vacuum schematic is really not all that difficult if you study it closely.
Your period EGR System will use a either a Vacuum Control Valve (PVS) (coolant temp) and/or a Thermal Vent Valve (air temp - mounted in air cleaner) to allow the system to operate once a certain engine temp has been reached.
You will also have in the circuit a Load Control (WOT) Valve to allow the valve to close on extreme acceleration.
Your period EGR System will use a either a Vacuum Control Valve (PVS) (coolant temp) and/or a Thermal Vent Valve (air temp - mounted in air cleaner) to allow the system to operate once a certain engine temp has been reached.
You will also have in the circuit a Load Control (WOT) Valve to allow the valve to close on extreme acceleration.
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