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'84 startup smoke

S

silver84

Guest
After my L83 has set for awhile (couple hours or more), when you start it, it puffs a bit of smoke, then clears up.

Any ideas?

Thanks
 
E

Eagle85C4

Guest
Valve seals and or valve guides...common for 350's as well as the 305....
 

WhalePirot

Well-known member
Joined
May 9, 2002
Messages
2,942
Location
SoCA
Corvette
1984 White Z-51/ZF6-40/Shinoda body
Yupppp

Valve seals are relatively easy to change, too.
 
L

LarryBible

Guest
Yes, the seals are easy to change, and sometimes will help. Many times though, the guides are worn and replacing the seals doesn't accomplish much.

The key is bronze wall guides. When it comes rebuild time, use bronze wall guides. Small block Chevies have always been tough on guides. The bronze wall is basically a bronze heli coil that is put in place then reamed to size. They will stay tight for a long, long time.

Good luck,
 

JonM

Well-known member
Joined
Mar 12, 2002
Messages
2,421
Location
East Haven, CT- USA
Corvette
84 Coupe
It is not necessarily the valve guides all the time. I had the same problem before I did a major preventive maintenance program on my car. I changed all the sensors, cleaned the IAC and its port, adjusted the TPS , changed all the filters (air and fuel) changed the PVC and changed all a vacuum hoses, plugs, wires, coil…ect. Now I start it up and clean a as whistle. I passed emissions with nearly a perfect score. Check the color of the smoke.

black = excess fuel
white = water or coolant
bluish = oil
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,236
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
JonM said:
It is not necessarily the valve guides ...

The seals are the problem, not the guides. GM fixed it later by utilizing a different style seal. ;)

_ken :w
 

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