I have a 78 620. This is my first Datsun and I dont know much about egr and vacuum lines. I bought this in February. It has always ran good but always had a small exhaust leak coming from near under the hood and it has always idled where it seems like it is gonna die every 20 seconds or so but doesnt. The guy I bought it from installed this weber carb himself. I always knew something wasnt right about how everything was hooked up, as it looks like it is missing vacuum lines. It ran ok so I ignored it. I always thought the exhaust leak was from the header gasket...
Today I failed deq with high HC and CO. I started looking at things closely under the hood. I am sure I found my exhaust leak. This tube is capped with a rubber cap and it has what seems like exhaust coming out of it where pressure increases when I give it gas. Its obvious that it has been leaking through that rubber cap. A bunch of other stuff has to not be right.
Any help is appreciated. I want this to pass deq and get back on the road.