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Discussion Starter · #21 ·
any update on this
hey dodge boys! thanks for checking in. I'm hooking up everything today. Finally got all of the extra parts and vacuum hoses. I had a CCEGR (vacuum control valve on the intake manifold) on order forever on ebay and it took a long time to come in from texas. Wish me luck on the install. Just sawzall'd the vacuum amplifier mounting plate and mounted it on the head. Once everything is hooked up, is there an easy way to test that its all working? I have a brake bleeder/vacuum tester gauge. I bought a new EGR valve but once I pulled the old one, I tested it and it still works as well, so I know that much, but I'm not sure how to test the vacuum amplifer. There's tons of ports on that thing haha. Hoping I hook it all up correctly.

Once it's hooked up, would I just rev the truck to 2k rpms and watch the egr valve to see if it moves? Seems like the easiest test to me but I wanted to check.

Another thing, the previous EGR valve was left installed and not hooked up. It was extremely loose (to the point where I could shake it with my hand). This leads me to believe that it could have been sucking in air through this port originally since it was loose and connected to the intake. Is this true? The truck ran great even like this so it makes me think maybe the port is clogged (decent amount of carbon builup, but not a ton). I'm wondering if there's any way to clean all of this out without taking off the whole manifold. Would love someone's more educated opinion on this though, I'm a pretty greenhorn mechanic, just doing my best to learn. Thank you!

 

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Discussion Starter · #22 ·
Sorry, looks like my old computer posted this twice. Can't seem to figure out how to delete it.
 

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Discussion Starter · #23 ·
Update - I installed the new EGR valve and pulled a vacuum with the tester directly on the egr. It's definitely slowing down the idle speed now significantly when I pull a vacuum so the valve definitely works and there is nothing blocking the intake or exhaust. Now I just need to hook up the rest of the vacuum equipment and hope that it's all working as well.
 

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to test all this stuff like the CCEGR valve you need your vacuum gauge and a pan of hot water / the vacuum Amp is just that , you hook to the right nipple and is AMPLIFIES the vacuum signal [ you need to either hook it to the motor or two vacuum gauges ]
 

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Discussion Starter · #25 ·
to test all this stuff like the CCEGR valve you need your vacuum gauge and a pan of hot water / the vacuum Amp is just that , you hook to the right nipple and is AMPLIFIES the vacuum signal [ you need to either hook it to the motor or two vacuum gauges ]
There are 5 different ports on the back of the vac amp, is the way you hook this up important at all? or do they all lead to the same place? Any chance you could identify where each port is meant to go? I have a decent idea from looking at my diagrams in the service manual but its not specific at all. Thanks so much in advance!

 

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There are 5 different ports on the back of the vac amp, is the way you hook this up important at all? or do they all lead to the same place? Any chance you could identify where each port is meant to go? I have a decent idea from looking at my diagrams in the service manual but its not specific at all. Thanks so much in advance!


its not specific because its a "molded plug" and it has FORMED lines that its almost impossible to screw up [ but thats Only if you have the vacuum harness that hooks to it ] if you DONT have it l have NO CLUE
 

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without the vacuum harness it pretty much a CRAP shoot to hook it up

617257
 

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your gonna need someone with all the stuff hooked up for pictures and diagrams
 

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Discussion Starter · #29 ·
your gonna need someone with all the stuff hooked up for pictures and diagrams
Sorry Dodge boys I should have been more clear! I have the harness that came off a junk yard car, but all the hoses were cut. The hoses are all color coded which should help by cross referencing the manual. I was planning on using the original harness with plastic vacuum line connectors and new vacuum lines. Here's some pics of what I have -


 

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Discussion Starter · #30 ·
Quick update - my friend scott who has a 77' ramcharger with a 360 lives up in Sacramento a couple of hours from me. I'm going to have him run all his vacuum hoses and see where they hook up for me. Thanks Dodgeboys! I'll let you know when I get it all sorted.
 

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Discussion Starter · #31 ·
Update. Got the EGR working. Got the truck retested, failed the EVAP test this time but passed everything else. Going to be replacing the evap lines from the fuel tank/charcoal canister next.
 

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1975 W100 Power Wagon Adventurer Sport 318 727 NP203 3.55
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watch those before you throw away one has a plastic "flow restrictor" inside or at least that was the case on my 75
 

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Discussion Starter · #33 ·
watch those before you throw away one has a plastic "flow restrictor" inside or at least that was the case on my 75
Good to know! I'm going to take a hard look at my service manual so I know what hoses to replace. What size hose do you think I need you reckon? Are they all the same size? Thanks!
 

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Good to know! I'm going to take a hard look at my service manual so I know what hoses to replace. What size hose do you think I need you reckon? Are they all the same size? Thanks!
while You're looking check where the vent hard line is under the passenger door. in mine the top 50% of that hard line was missing
 

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the Best way to test is with a "smoke" machine [ which you probly dont have ] so back in the day before smoke machines we used compressed air [ gotta put a Reg in , no more than 5 to 8 psi ] and then crawl under and find the leak


617460
 

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Discussion Starter · #36 ·
the Best way to test is with a "smoke" machine [ which you probly dont have ] so back in the day before smoke machines we used compressed air [ gotta put a Reg in , no more than 5 to 8 psi ] and then crawl under and find the leak


View attachment 617460
Awesome, thanks for your help dodge boys!! I'm getting closer. Can't wait to finally be legal and enjoy this truck. I at least got a 60 day extension notice from the DMV today when I showed a failed smog test so I can drive it legally in the mean time.
 

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Discussion Starter · #37 ·
while You're looking check where the vent hard line is under the passenger door. in mine the top 50% of that hard line was missing
I'm not sure what line you're referring to but I'll crawl under there tomorrow with a headlamp and take a look around. thanks for your help! I really appreciate it. This is all new to me so I'm glad people have been so helpful.
 

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1975 W100 Power Wagon Adventurer Sport 318 727 NP203 3.55
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I'm not sure what line you're referring to but I'll crawl under there tomorrow with a headlamp and take a look around. thanks for your help! I really appreciate it. This is all new to me so I'm glad people have been so helpful.
should be a steel vent line from your fuel tank to the charcoal can. Apologies if it doesn't run the same I was thinking you had a 78 pickup. For me the line comes from the rear tank and "T"s into the forward tank vent line right before it goes up into the pillar. once it makes a "U" in the pillar it drops under the door (inside the Cab) and follows the door jamb until it's under the hood.
617469

I don't have (or can't find) a ramcharger Diagram though
 

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right here , and its NOT the gas line = EVAP line to gas tank like YOUR diagram says



617470
 
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