smoke at start up
Thread Starter
Pro
Joined: May 2005
Posts: 510
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From: crofton maryland
smoke at start up
was trying to get some info on some i would say grayish blue smoke at some start ups. not all the time mostly after she warmed up and sat a few minutes. i am kind of thinking injector leak down or oil blow by? i don't think head gasket, since ever since i have had my 1986, L-98 just hit 90K, it never runs hot, never notice water in oil, or sweet smell at exhaust.
Thanks for any help you can give.
Thanks for any help you can give.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
probably not an injector problem, but good idea to check first since its so easy...harber fright has a fuel pressure test kit on sale now for $8 if you don't already have a tester.
most likely valve guide seals or worn valve guides....most oem aluminum heads develop loose guides at about 50k miles cause the factory didnt use any guide other than the aluminum head itself--have an auto machine shop put in bronze guides and grind the valves/seats...valve seals harden due to heat/age and don't stop oil--might help if you just put new ones on, but at 90k--not too promising
most likely valve guide seals or worn valve guides....most oem aluminum heads develop loose guides at about 50k miles cause the factory didnt use any guide other than the aluminum head itself--have an auto machine shop put in bronze guides and grind the valves/seats...valve seals harden due to heat/age and don't stop oil--might help if you just put new ones on, but at 90k--not too promising
Team Owner
Joined: Jan 2003
Posts: 20,304
Likes: 240
From: Summerland B.C. Canada
Good chance the valve seals are done. New seals cured mine.
Originally Posted by redrose
most oem aluminum heads develop loose guides at about 50k miles cause the factory didnt use any guide other than the aluminum head itself
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
Originally Posted by AGENT 86
Good chance the valve seals are done. New seals cured mine.Are you sure about that. Can't see aluminum guides lasting long. My factory aluminum heads came with pressed in guides. I recently rebuilt my heads and had the shop install bronze liners into the guides. Better than new now.
gotta visit the man monday, i'll ask
Last edited by redrose; May 6, 2006 at 09:53 AM.
Thread Starter
Pro
Joined: May 2005
Posts: 510
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From: crofton maryland
yeah i was thinking typical chevy too. like rear main leaks!! i have a early 86 with cast iron heads.
last time i did a fuel pressure check i was right at 39psi which is right for L-98, but after i shut the engine off i got a pretty fast drop in presssure to about 25psi and then it stayed like that a while.
last time i did a fuel pressure check i was right at 39psi which is right for L-98, but after i shut the engine off i got a pretty fast drop in presssure to about 25psi and then it stayed like that a while.
Drifting
Joined: May 2004
Posts: 1,747
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From: Port McNicoll Ontario
I'm going to go with the crowd on this one and say valve seals.
I just replaced mine and it cured the problem.
They say white smoke=water, black smoke =fuel and blue smoke =oil.
If you have bluish smoke that says oil. When I replaced mine I couldn't even tell the old ones were bad but the smoke went away. The little o-rings on the valves crumbled when I touched them though.
I just replaced mine and it cured the problem.
They say white smoke=water, black smoke =fuel and blue smoke =oil.
If you have bluish smoke that says oil. When I replaced mine I couldn't even tell the old ones were bad but the smoke went away. The little o-rings on the valves crumbled when I touched them though.
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From: levittown pa. usa Even a bad day with my `Vette, is better than a good day at work
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Originally Posted by CMYC4GO
Just the nature of a SBC. You might also check to see if your drain backs are clogged. same here the seals were bad on my `87 at 34k. I replaced them--- end of problem
