Ok so im blowing out white smoke. iv already replaced my intake manifold gasket and let it sit for 24 hours. im blowing smoke out of the refill oil cap and water is spitting out the inside top part of my throttle body. where is the water coming from? oh also i did a compression test and im getting 130-150psi soooo whats the deal? can someone that knows what there doing please help me?!

 

Let's move this to LT1 Based Engine Tech..... it's not "Advanced Tech".

 

Whew... Let's see... White smoke and water. Is there coolant mixed in? I'm thinking a bad head gasket, but if your compression is good, it seems unlikely. I'll be honest though, the water out of the throttle body isn't a good sign. Yeah....is it straight water or mixed with coolant?

 

White smoke is a dead give away of a blown head gasket. If it is coming out the exhaust and out the fill cap.

Take off the right/driver side valve cover. It is easy and takes like 5mins. Flip it over and look for a while milkshake deal. Actually will look like lotion. There is your problem.

 

The stock throttle body has coolant in the bottom plate. If the gasket is bad in the plate, the coolant will get into the idle air passages, and could be flowing out of the idle air hole between the bores in the throttle body.

Before you panic, check the bottom plate on the throttle body for being loose.

Then we're back to panic mode. A lot of smoke coming out of the oil fill tube can mean excessive blowby, or water getting into the oil. That would also blow backwards out the vent tube from the valve cover to the throttle body, and would drip out the top of the throttle body.

 

Does the white smoke smell like anti-freeze? Or sweet? Mine was unmistakeable when it went..and the white smoke differs from other conditions in that the smoke is very thick and doesn't disappear quickly at all.

Some may suggest using a pressure tester but I wouldn't recommend it. When I did my h/g I did that first to make sure, the pressure held at 14lbs for like 45 sec, then it dumped quick and I heard coolant dump somewhere inside my engine. Few weeks later when I finally got my heads off I had coolant sitting on top of two pistons. It's fine now but why risk the damage.

 

thanks for all the advice. the exhaust smells normal no sweet smell, but it does look milky from inside the oil add cap which i know is water mixing in the oil. iv bypassed the throttle body coolant and the stuff coming from the top of the throttle body looks like strait water not mixed. it doesnt smoke until it worms up which it doesnt shoot out water till it worms up either which tells me the white smoke is from the throttle body but im no mechanic. it just seems to me its way to much water to be a blow head gasket because im talking about a steady stream of water. this also is causeing my intake manifold to be extremely hot. thanks again everyone for the advice.

 

Yeah, Injuneer is right. As I said before, from what you said I am not thinking blown head gaskets, especially if your compression is A-OK. But who knows? How many miles is on the vehicle? Just curious...

 

theres 154,000 give or take im just hoping that before he even pulls everything apart, he finds the problem

 

Wow, 'bout the same as mine, but I just had the heads and all the gaskets redone. You know for sure it's not a head gasket?

 

was it doing it before you changed the intake gaskets?

where exactly is water shooting out of the throttle body - and this is after you bypasses teh throttle body coolant hoses?

how bad did you overheat it?

if the head gasket is not leaking until it is hot then obviously the compression reading will be relatively good when cold - not saying its your problem just pointing out your means of ruling it out are incorrect

 

Dangella:

Yes, exactly. Although he didn't say whether it was overheating or not. That would also be a key bit of info we could use. One thing's for sure...something is majorly !*&%ed up in there.

 

i know he did not say it

 

ok well i sat the camaro about a year ago because it had 6 injector leaks and i was going to college. it was at that point where everything bolt on needed to be replaced. so in january i started to work on it again. replaced water pump, a/c bypass pully, injector orings ect. and i forgot to purge it after flushing the radiator so it over heated but i havnt had it on the road yet just enough over heat for me to turn it off and fix the probs. then i put everything back on and some how hooked up the air pump to the water pump...yea i know stupid. and it sucked in water from what was left in the air pump after i hooked everything back up the right way. it blew white smoke so i thought it was the intake manifold gasket and hoping not head gasket. well after that i found out water doesnt even go through the manifold. now im back to where i was. but the water is coming from the top v looking area in the throttle body and sucking back in. and that would make since for the compression to be fine when its cold since it doesnt smoke till hot. it just seems like sooo much water to be coming out of the throttle body like did my head gasket just disappear all together good god.

 

Oh, gotcha! Kk!

LOL! I'm not trying to make light of your situation at all, but that's pretty funny! I'm still trying to figure out how you hooked that up, but that's OK. :P And yes, water doesn't go through the manifold. LOL! Exactly how much water is it? It's not residual, is it?