Can anyone tell me why this might be happening? When I first start my truck (49 Chevy), It blows out what looks like oily water. It has a 235 six cylinder engine, pretty stock. I have to choke it when I first start it, but it doesn't have to stay choked long. It does have to warm up, though, before it will run smoothly. It smokes slightly when first started, but then clears up and doesn't smoke once it's warmed up. It doesn't seem to be using any oil. I can't tell that I'm losing any between oil changes. It sure makes a mess on the floor and I would like to fix it if it's something that can be fixed without an engine rebuild.
"Run it like you stole it"- - - - -frequently. That's condensation that builds up in the exhaust system because the pipes don't get up to running temperature often enough. The "smoke" is steam. The entire exhaust system, pipes and muffler, need to get hot enough to evaporate the condensation away that's a normal byproduct of burning a hydrocarbon fuel. Hydrogen + Oxygen = Water! Jerry
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The carbon is because of an overly rich fuel-air mixture. Probably like Jerry says, you don't get it warm enough by not running it for very long. More time choked equals an over-rich mixture. The carbon in the hydro-carbon fuel doesn't get combined with enough oxygen to form CO2. The other side of the combustion equation is Carbon + Oxygen = Carbon Dioxide.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Short trips around town allow the condensation to build up so when you start it up it blows it all out. Drive it harder and more often.ðŸ›
Martin '62 Chevy C-10 Stepside Shortbed (Restomod in progress) '47 Chevy 3100 5 Window (long term project) ‘65 Chevy Biscayne (Emily) ‘39 Dodge Business Coupe (Clarence) “I fought the law and the law won" now I are a retired one! Support those brave men/women who stand the "Thin Blue Line"! Hug a cop! USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
I drove mine to work almost daily in Texas. I don’t use choke, timing and fuel mixture have been set and my 216 does it on every start up despite regular driving when fully hot.
Basic, is it is the nature of the beast. Everyone has the right answer, here in the South humidity is the culprit. You may want to look at your choke plate to make sure it is completely open. The manual choke can slip and stay partially closed or tilted always on a model "B". Doc
Currently making 1954 3100 better than new and Genetics
Thanks all. This truck doesn't get driven much, mainly because I have such little time and I'm usually tinkering with something on it that keeps it parked for weeks at a time. Sounds like I just need to get it out and drive it more often. Appreciate all the feedback.
