Heavy smoke at start up

[POINTER94]

My brother has a 1990 Regal valenti with a 305 mercruiser with an alpha 1 outdrive. When you start it in neutral it spews BLACK thick smoke and as soon as you put it into gear is disappates within a 30sec - 1min or less time frame.<br /><br />There doesn't seem to be a connection to engine temp or time of inactivity. Also the engine runs just perfect other than this annoying and somewhat concerning quirk.<br /><br />Any ideas or help would be greatly appreciated.<br /><br />Thanks in advance!!

 

[crazy charlie]

Re: Heavy smoke at start up

Black smoke is usually a fuel problem.The carb may be out of adjustment.If it is grayish then it is probably oil related.Charlie

 

[elpaso]

Re: Heavy smoke at start up

It could be valve seals - ? - when sitting oil<br />leaks down past valve seals into cylinders,<br />and burns off when engine is started. You<br />will see smoke for a few seconds and then<br />nothing.<br /><br />One or two spark plugs may foul after a few<br />hours, change plugs and keep on running.

 

[jam39vw995]

Re: Heavy smoke at start up

The GM 305's were notorious for oil past the valve guides and thus "blue" smoke on start up. I owned 2 camaros with this problem. Both fixed by the dealer under warranty.<br /><br />Black smoke on startup is excessive fuel. How many times are you pumping the throttle before start? Remember that fuel is squirted into the carb via the accelerator pump and too much pumping will cause this.<br />Choke setting may also be incorrect but would cause black smoke all the time while the choke is in operation until the choke shuts off.<br /><br />I hope this helps.<br /><br />Jeff