Cooling system only builds pressure when it is hot. The compression in the cylinder (+150 psi) will over come any pressure in the cooling system. The only time the water will enter the cylinder is when the cylinder is on the intake stroke, thats is when there's a vacuum in the cylinder.

thanks this might sound dumb but been that so far since i notice this issue i haven't had to add antifreeze that there could be a possibility of condensation build up on that cyl-3

Have a read of the link below and see what applies in your case. You may need to spend some money having the problem isolated and then repaired.

AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - Symptoms of a Blown Head Gasket

thanks i'm thinking hard to start taking it apart. the only thing holding me up at this moment i need better info on the timing, as the last one i did was when i had a 78 530i single cam.i already have a few parts off waiting for the ccv to come in thinking it had to do with it but it ddin't so i have few things off the intake out already.i guess the info i need is on the vanos.?? setting

Since you are seeing white smoke out the back the fluid from #3 is most likely coolant. You should be able to confirm what it is by color or smell. Also, when you check compression in #3 cylinder it should have less compression than the others. Do you have any dash warning lights? Have you checked for error codes in OBC?

yes it is antifreeze that is why i decided to take it apart.also found the problem for cdt-po491 vaccume hose broken under by back of intake.i just need info to take top half timing cover and gear off.i also found that they put a new water pump new fan clutch and radiator but they use the old hoses.

need help bad i started to tear it down now i'm at a stand still cause it says i need
Camshaft Alignment Locking Timing Tool + tensioner tool expensive as hell i found a kit on ebay under $100.00 but it doesn't have the tensioner tool i don't want to pay for a tool that i would only use once i need suggestion as to where else can i get these tools
thanks

Just what are you doing? Are you taking the head off to replace the head gasket?

yes i'm

Sounds like they had a overheating issue at one time and tried to fix it. Nothing they did worked so they decided to dump the BM Trouble U. In addition to the Head gasket, the head and block could be warped.