My buddy has invested in a 86 sammi, runs great but smokes like no other. We have changed the vavle seals, installed a new fuel pump, and pcv. It's a bluish gray smoke, and it's pretty much all the time. It almost smells like raw fuel.
Oil smoke is often blue-ish or gray, unburned fuel in my experience can be about any color but usually black if rich. Valve seals are one way for oil to enter the cylinder but also the lowest ring on the piston (oil control ring) it can wear and allow oil to pass up into the cyl, burn and be expelled through the exhaust in the same way.
Assuming it's in good tune, fresh fuel, clean filters and all maintenance current I would pull the plugs and see if they indicate a rich/lean mixture, oil fowling or possibly coolant seeping into the cyl. If your not sure what that looks like you can google "how to read spark plugs" and see pictures of how to interpret them. If your still not sure post a well lit close-up pic of the plugs here. All four plugs should be pretty consistent with each other. While the plugs are out is an excellent time to go ahead and do a compression test. It will help rule other stuff out.
Just for fun, does this beast have the original carb and emissions stuff on it? Any mods? What approximate locality are you in?
87 Samurai ragtop, 16v 1.6L MPFI, Thorley header, 2.25" exh w/magnaflow cat & muffler, full custom dash & instruments, PS, AC, 410 Toyota axles w/rear lockrite and front ARB, Jeep YJ springs, Missing links, 6.4:1 xfer gears with twisted T conversion, early 5 speed, 35x12.5 Wranglers. .
Last edited by caseyjones955; 02-25-2016 at 09:29 PM.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.