??? about my 240sx...

[jaime1980]

I have 91 240sx with a full stainless steel catback it has no catalytic converter. It also has no egr valve I but a block off plate so its just straight pipe to the muffler. When Im stop and I take off I notice the car throws buffs of white smoke. And what I notice it happens alot more when its alot warmer outside. Just want to know if thats normal because off the stuff I took off..

[airman86]

you shouldn't be seeing any white smoke. white smoke usually means burning antifreeze (steam), which is usually characteristic of a bad head gasket, but if this was the case you would see this smoke more consistently rather than taking off after idle.

what you're describing seems like a valve seal issue. as you sit, oil accumulates around the valve seals and when you take off (higher rpm) more of that oil leaks into the cylinders causing smoke as you take off.

if you can, go out and buy a $30 compression tester that screws into the spark plug holes and test compression in each cylinder. they should be within ~10-15% of each other. if they are less than 140psi, there might be an issue with your piston rings/head gasket/valve seals. to find out if it's your rings or not, drop a little bit of oil in each cylinder (sealing the cylinder rings a little better). check the compression again and if the numbers are significantly higher, then your piston rings are to blame. if they don't really change too much, then the best bet is stem seals or head gasket.

[PapaSmurf2k3]

Try and have someone smell it... if it smells out of the ordinary, or sweet, its coolant. If it smells like normal exhaust, it could just be water accumulated in your exhaust that is burning off once you hit the gas, and increase your EGTs.