amsashooter 447 Posted December 14, 2019 Hey guys. I don't spend much time on this page, mostly in the coffee shop and general IH, but figured this was the place to ask about this. This is my 1974 1800 loadstar with the SV345. What do I have going on here???? That is either smoke or a vapor coming out. Quote Share this post Link to post Share on other sites
chip man 17 Posted December 14, 2019 My first guess would be vapour, but I have a couple of questions. Is the engine running in the picture? And is this a four barrel carb? Quote Share this post Link to post Share on other sites
amsashooter 447 Posted December 14, 2019 Engine not running, I haven't taken the air cleaner off, I would assume it's a 2bbl. Quote Share this post Link to post Share on other sites
65806 158 Posted December 14, 2019 Put a new rubber cap on there. looks like some vapor coming out from a crack in old cap. Pretty normal to see a little fog in that port for a short while after shutting off the engine. That is just a vacuum port that your not using in your application. Could go to a brake booster or pvc valve if used on a different truck. just my 2 cents Quote Share this post Link to post Share on other sites
R Pope 246 Posted December 15, 2019 That's a four barrel. IH v8's have habit of popping in the carb when you shut them off, that's where the smoke comes from. It can burn the truck down, check under the hood before walking away after running it for a time. I find that a bit more advanced timing decreases the problem, as does an electronic ignition conversion and fresh plugs. 1 Quote Share this post Link to post Share on other sites
