Ok....now what?
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
If you're not running EGR, you may need to back off the advance a bit to avoid knock (with EGR, the timing is more advanced to make up for the lower flame speeds). If it's not knocking under load though, I wouldn't worry about that level of detail for now.
You said it was running OK when the vacuum line was off the carb, meaning you may've had a vacuum leak at the time? Could it be that you tuned the idle mixture to compensate, and it's off now that the leak is corrected? Is the problem only at idle (running OK off-idle), or is it problematic everywhere?
You said it was running OK when the vacuum line was off the carb, meaning you may've had a vacuum leak at the time? Could it be that you tuned the idle mixture to compensate, and it's off now that the leak is corrected? Is the problem only at idle (running OK off-idle), or is it problematic everywhere?
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Senior User
Joined: Apr 2005
Posts: 453
Likes: 1
From: medford oregon
Ya I got that. I didn't know that the lack of a EGR would effect the vacuum advance. I cant imagine that they had all this work done and didn't address a serious issue with the vacuum advance.
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Senior User
Joined: Apr 2005
Posts: 453
Likes: 1
From: medford oregon
I tuned it with the vac adv on for the carb idle screws. It fell off somewhere while driving. I cant remember it running bad after I finished the carb tuning but now it is with the vac on. Very strange.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
I'm really kind of excited about your project because I've been seeing van 4x4 rolling chassises coming up for sale and would alwais pass because I thought the bodies we're limited to 73-79 .. Now that I know the bodies til 91 will fit it makes a project like that a lot more doable .. The wife and I like to do back country camping and a 4x4 van is the ticket with a high single axle trailer 
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Senior User
Joined: Apr 2005
Posts: 453
Likes: 1
From: medford oregon
Hell ya! I was thinking about buying another 78 that is for sale here just because. Im probably going to put a class B camper body on this chassis. Ill definitely do a writeup on the build.
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Senior User
Joined: Apr 2005
Posts: 453
Likes: 1
From: medford oregon
and its 75 to 91. pre 74 was unibody. Its obviously better to get as late as possible for newer metal and less wear. 92+ is absolutely way too much work to fit on a pre 91 so that's out the door.
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Lead Driver
Joined: Nov 2006
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From: Pa.
I was really surprised how well sheet metal holds up out there ..
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
