Blue Smoke on Start Up?
Question:
Hi Don Thanks for a great and logical explanation. I will take you good advice too and it don’t get any worse, I will just enjoy the smoke screen and sniff the aroma. Hunter – Hide quoted text — Show quoted text ->Probably Valve seals… >When the engine just sits, the worn seals >allow oil to seep down into the valve area >and combust on startup. >Just a annoyance. >My 74 Cheyenne looks like the Bat Mobile setting a >smoke screen when it starts up and uses oil but runs >great otherwise. Been doing that for years. >I think it may be possible to replace them without pulling the >heads.. >Check with your mechanic. >db > I have an 89 1500 with 6 cy eng. When I start it up after sitting for > a while I get blue smoke from the exhaust. The engine has 60 k on it. > How does this oil get into the cylinders if that is what is happening > while it is sitting? Have noticed that the engine seems to use oil > too. > Hunter
Response:
Thanks G Going to close my eyes and ignore it like you suggest. Hunter – Hide quoted text — Show quoted text – >I once heard that GM used teflon valve stem seals on their 88-89 engines >instead of rubber. Once these seals had worn a bit it caused the symptoms >that you describe. If you replace the teflon with rubber seals then it will >work fine until the rubber gets hard and brittle and then the problem >reccurs. I have had experience with the same thing on an 88 GMC 305. Never >did replace the seals and the truck worked fine. Just close your eyes when >you first start your truck and you will have no worries. >;o) > Cheers, > G > I have an 89 1500 with 6 cy eng. When I start it up after sitting for > a while I get blue smoke from the exhaust. The engine has 60 k on it. > How does this oil get into the cylinders if that is what is happening > while it is sitting? Have noticed that the engine seems to use oil > too. > Hunter
Response:
A 4.3, I guess. Might get by with valve seals, might need a valve job. I had 2 that needed valve jobs Mark
Response:
I once heard that GM used teflon valve stem seals on their 88-89 engines instead of rubber. Once these seals had worn a bit it caused the symptoms that you describe. If you replace the teflon with rubber seals then it will work fine until the rubber gets hard and brittle and then the problem reccurs. I have had experience with the same thing on an 88 GMC 305. Never did replace the seals and the truck worked fine. Just close your eyes when you first start your truck and you will have no worries. >;o) Cheers, G
– Hide quoted text — Show quoted text -> I have an 89 1500 with 6 cy eng. When I start it up after sitting for > a while I get blue smoke from the exhaust. The engine has 60 k on it. > How does this oil get into the cylinders if that is what is happening > while it is sitting? Have noticed that the engine seems to use oil > too. > Hunter
Response:
I have an 89 1500 with 6 cy eng. When I start it up after sitting for a while I get blue smoke from the exhaust. The engine has 60 k on it. How does this oil get into the cylinders if that is what is happening while it is sitting? Have noticed that the engine seems to use oil too. Hunter
Response:
Probably Valve seals… When the engine just sits, the worn seals allow oil to seep down into the valve area and combust on startup. Just a annoyance. My 74 Cheyenne looks like the Bat Mobile setting a smoke screen when it starts up and uses oil but runs great otherwise. Been doing that for years. I think it may be possible to replace them without pulling the heads.. Check with your mechanic. db
– Hide quoted text — Show quoted text -> I have an 89 1500 with 6 cy eng. When I start it up after sitting for > a while I get blue smoke from the exhaust. The engine has 60 k on it. > How does this oil get into the cylinders if that is what is happening > while it is sitting? Have noticed that the engine seems to use oil > too. > Hunter
