Hey all, I'm new to supra's and just picked up my first about a week ago. It's an 89 Turbo. Anyway, I've noticed it smokes on deceleration. But not right away. If I get off the highway or let off going down a hill, after about 5-10 seconds it'll start smoking pretty good. I thought it might be the turbo, but its a recently upgraded 57 trim. Only a few months old. The other thing is, after it's sat overnight, or for a long period of time, it has a little trouble starting and when it does there's a puff of smoke too, but not after it's been run recently. Anybody have any help? I've searched around a bit, but I haven't really found anything helpful.
Smoking on decel?
- Thread starter The Juggernaut
- Start date
what color is the smoke?
from what ive learned through reading, if its blue its the turbo and if its black thenits just oil. if its white you got BHG.
from what ive learned through reading, if its blue its the turbo and if its black thenits just oil. if its white you got BHG.
PROJECT N00b;1118953 said:
I don't think it's the head gasket. It was replaced by the last owner. Metal head gasket and ARP studs.
To be honest i can't tell if the smoke is blue or black. I'm color blind and the rear glass is tinted so it's hard to tell. I'd say it's gray looking.
^^^^he just said hes color blind...
ask a friend to tell you what color it is, given he isnt color blind
ask a friend to tell you what color it is, given he isnt color blind
Typically blue smoke on decell points towards worn rings. The negative crankpressure would push oil past the rings then will be burnt in combustion. Worn valve seals could be the reason for the puff of blue on next day start up because of the oil leaking from the head into the cylinder. I couldnt see worn valve seals leaking profusly enough to even notice once the engine is warmed up.
Try doing a compression test. Optimum spec is 156psi. Minimum spec is 128psi. The max allowable difference between cylinders is 14psi. and one more test is if you get a low pressure, pour a small amount of oil into the low cylinder and retest again. If the pressure rises it is worn rings.
Try doing a compression test. Optimum spec is 156psi. Minimum spec is 128psi. The max allowable difference between cylinders is 14psi. and one more test is if you get a low pressure, pour a small amount of oil into the low cylinder and retest again. If the pressure rises it is worn rings.
ChrisC;1119327 said:
Great, thanks a lot. I don't think you could have put how to to that any better. I'll be checking it out sometime this week.