well long story short im currently deployed and when i family member move the 300zx i wasn't their (obviously) which really sucks a fat one but this is as much info and as much detail as i received over the phone

what happen was it stalled out while driving on the highway not more then 20miles into driving.the oil pressure was low and when they check the dipstick there was no oil but was toped off before they left all fluids were checked.there is no sign of an outside leak anywhere the engine bay is spotless as if it was off the show room floor.there was no smoke from under the hood or threw the exhaust when this happen after it stalled it took a moment to get it to run again and now its idling rough with a click somewhere in top of the engine the tow truck guy told them it sounds like the lifters but who knows at this point. i had them check the coolant to see if there was any odor or trace of oil in it and vice versa with the oil and there was no abnormalities to the fluids.so in my opinion and experience i think that would eliminate a blown head gasket but still an poss of a blown oil seal some where. not sure what the boost level was they said they didn't hot rod it but honestly who wouldn't . isk if itd be a lifter seal or where the hell the oil went. im afraid to even ask them to start it to move it anywhere...

any ideas or if anyone has had this issue before
theres olny 144k miles top end was rebuilt not to long ago.

plan on taking to a mechanic but if some one know what this is and its a simple fix il do it my self when i get back in a few weeks

 

Do a compression test, pull off an intake hose and see if it's covered in oil.

 

..idk what that would prove its not a mass airflow sensor issue.

 

so its been rebuilt top end wise

 

Your intake doesn't end until it reaches the plenum, a bad oil seal in the turbo would fill and cover the intake hoses and IC's with oil.

 

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ok well everything from the head units and up was professionally rebuilt. and the turbos replaced which. ive come to the conclusion its the oil sending unit in the bottom of the engine making the knocking sound we had a similar issue with one of our other cars it acted and sounded the same way according to my brother who was nice enough to help me out while i cant do crap till im in the states again...after peiceing as much as i can in my head what cause this was the fact new upgraded garret turbos were install on the engine when the top end was rebuilt where the bottom half had 142k miles having those new turbos pushing to much pressure for the old seal to handle....next question how much will this cost to get replaced .

 

You must be new to cars to believe new or rebuilt part/s can't be a problem. A bad oil pressure sender will give no reading, unless it was touched or installed wrong and only then will it leak and you would notice a leak big enough to make the dipstick read empty.

I'm betting rings, improperly installed heads or bad turbo seals. Just because you can't see smoke doesn't mean the motor isn't burning oil.

 

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no but that fact im not losing oil tell me thats not the problem


ive been building cars for years so im obviously new to cars...there isnt an oil leak any where nor is it losing oil just..it lose oil pressure while driving and it stalled.all thoughts pointing toward the unit that sends the oil..if the heads were installed wrong it wouldn't start on the first turn every time.and wouldn't have been able to drive as far as it had that day. especially since its a high compression engine it would have blow **** everywhere.trust mea ****ed up head unit isnt hard to miss.and im not talking about a pressure sensor im talking about unit on the bottom of the engine in oil pan that circulates the oil..

 

Mine went bad and it was giving me an off the charts high reading.

 

You said in the first post there was no oil on the dipstick and they had to fill the oil, which is what I assumed was the issue.

I'm still going to say compression/leakdown test and run codes.

Also what is your mods list?

 

If it's rebuilt top end, i'm betting rings or heads like hoov said. Turbos would show some sort of oil out the exhaust.

I feel your pain, my Z was moved while on deployment and I came home to the car completely unaligned and the new tires (expensive) I had put on it before I left completely bald and my low beams and fogs were blown (how all that happens is beyond me).

 

once again no issues with the rings or compression issues. i already know whats wrong with it like stated above a seal blew in side the engine. when an engine is rebuilt top end up pistons arnt touched...only the components in the heads get touched lifts and etc...so obivously my rings have nothing to do with this. as mods their are none and i dont plan to mod it. everything is stock except the turbines.

 

and as for the heads everythings working fine it was a seal internally. how do i know?.well the engine is apart right now being rebuilt.