I‘m in california so smog checks are a little harder here. I had my 84 jimmy tested and although i passed emissions, i failed visual inspections because of an exposed wire, unplugged minor vaccuum tube, and my idle speed rpm was too high. i have all this fixed, but because of the vaccuum hose im afraid my emissions might go higher now that it‘s plugged in. I don‘t think it‘d be TOO much, but i was nearing the limit for carbon monoxide. the guy doing the check said he didnt think the hose would make it go over when plugged back in, but there is that chance because it most likely will go up. I‘ve tuned up recently, and I‘m wondering about fuel additives as a just in case. I‘ve heard conflicting opinions, some people swear by them, some people say they‘re complete BS. The only time I really noticed a difference was in my old car i used one especially for cleaning out dirty carburetors, which mine was, and there was a minor performance increase. Anyone have any actual good things to say?
I use a fuel additive specificaly to get thru the emissions test, but best of all, take it for a hard fast drive just before the test
The use of fuel additives, such as BLUE SKY Clean Air, can be very helpful in lowering emission levels. Fuel additives are generally poured into a vehicle's gas tank during fuel refilling and mixed with ordinary fuel. Their purpose is to clean carbon deposits with in your engine's intake and exhaust systems, allowing for both fuel and air to flow freely within its passages, thus lowering emission levels and improving overall engine performance. These products offer helpful solutions to various vehicle emission problems.
OK, just remember the fact that the car passed the sniffer test. A loose vacuum line could hook up to something as innocuous as your windshield washer reservoir, or to something important, like your EGR valve. You certainly won't mess up your engine's performance or cleanliness by reconnecting your line. Patch your exposed wire with some shrink tubing. Buy a Chilton manual and find the port the vacuum line hooks to, and retest. Don't forget to smile smugly when it passes. Insofar as fuel additive goes, most of them simply consist of fuel system cleaners. As long as your Jimmy is in good tune, it should pass.
