vipershark11

iTrader: (6)

last night i was testing out my LO3s new nitrous system and as i was racing i saw white smoke coming out the exhaust and was wondering what that means and no it is not a headgasket.

Jekyll & Hyde

How big of a shot are you using?

vipershark11

iTrader: (6)

right now im testing with a 100 shot but soon upping to a 125 and im gonna go pull my plugs right now and check those then up my jets

83 Crossfire TA

iTrader: (2)

How do you know it's not a head gasket?

vipershark11

iTrader: (6)

i pressure tested my coolant system and nothing leaked out of it so i know its not the headgasket no coolant leaks out in my car

Jekyll & Hyde

Coolant can leak into the engine side of the gasket and would burn white.

Have you tuned anything? If there is too much nitrous compared to gas, it will come out of the exhaust as a grey type color.

1991CamaroRslow

iTrader: (3)

Viper that's probably either carbon in the engine or your cat's burning out. I doubt it's anything internal if it stops when you're not spraying.

1991CamaroRslow

iTrader: (3)

If there's to much nitrous to gas, you won't get a spec of smoke, but you will get fancy little specs of piston on your spark plug ends. Too much gas to nitrous will cause the car to burn black smoke which I consider a good thing, lets me know it's rich enough to be safe.

vipershark11

iTrader: (6)

i wasnt running too much nitrous to fuel i was running a bit rich not too much but i bet it was carbon because i have a gutted cat already it broke a while back. but i ran it too rich last night i could smell it plus it had no power so im downing my fuel jet

1991CamaroRslow

iTrader: (3)

Note from your other post I don't think you were running to much fuel, I'de say it was way to LITTLE fuel. PM me or go back to the other post and we'll try to get to the bottom of this.

83 Crossfire TA

iTrader: (2)

Some “pushed” headgaskets and cracked heads will not show up on a pressure test at all. I have one like that on the SBC in my truck _right now_.

It doesn’t show up on a pressure test. You can run it for about 15 minutes running and exhaust gas test in the cooling system and it’s fine, some time around then you start seeing bubbles in the radiator (dead giveaway) but for some reason the combustion gas test still doesn’t react till about 5 minutes after that. It doesn’t leak any coolant as long as you don’t fill it too high (it does blow some out into the overflow which will leak if you keep the overflow filled on the high side) that gets sucked back up when the engine cools down, and it doesn’t loose coolant fast enough to notice the coolant level dropping.

What got me looking for it in the first place was that I noticed that my O2 sensor was getting coolant fouled… I didn’t have any other symptoms that I noticed at the time and have driven it for a long time messed up without fixing it.

You could have a similar situation where the gasket is just barely pushed or a small crack somewhere that you only have enough cylinder pressure to have a problem when you spray it.

Now assuming that you’ve confirmed that you don’t have something dumping into the exhaust as a liquid when you’re spraying (most liquids, even oil sometimes, if you dump it in the exhaust instead of through the engine will come out grayish), I’d strongly suspect a coolant leak. If you don’t have ANY other evidence of it I would probably pop the valve covers, torque all the bolts and possibly even try some of the coolant system sealants (I’m wondering about the CRC nano stuff, never used it though) just in case. If that’s not it, you haven’t looked hard enough for something else leaking, but you also haven’t hurt anything and probably only spent an hour of your time and <$10, not a big loss.

vipershark11

iTrader: (6)

no the car doesnt smoke anymore at all so i dont have a problem its ok

83 Crossfire TA

iTrader: (2)

So was it raw fuel or something else?

vipershark11

iTrader: (6)

i think it was just carbon getting knocked out of the motor seeing as it was my second run on nitrous with the motor so...yea