Just got a 92 stealth tt for 2400! Need to narrow down a issue, any advice?

[bizie]

So I got a 92 stealth for 2400, I couldn't pass up the deal. It has full exhaust, down pipe, greddy type s bov, FMIC, FMOC, 15g turbos, the infamous apexi safc tuner, pro comp boost gauge, aem wideband. Looks to be a aftermarket intake manifold on it also. That's all I have found so far.

Like most turbo cars people sell this one was also out of tune, far out. It would pull great up to 4k rpm and then the boost would drop off from 14 and she would break up, I didn't keep on the throttle once she broke up so I don't know where the boost was dropping to or if it was just falling of the chart. When I first started this car (mind you it has been sitting for almost two years untouched) it smoked white smoke out of the exhaust, like a lot. It didn't smell or look like smoke from burning oil so my first assumption was a bad turbo seal causing coolant to burn up. I had to drive it home after the purchase so I got some valve seal renewal oil additive (thinking maybe has dry valve seals) and some fuel treatment for the old gas that was in it oil. I smoked my way to MD from NJ. By the time I got the car home it wasn't smoking anymore. The temp and oil pressure stayed normal but my boost would drop at 4k rpm and them the boost would break up. My coolant and oil levels have not changed and mind you I just went on a 200+mile trip home in her. When I got home I noticed the air filter was dry rotted and fell off the rubber clamp grommet, I noticed that on my rear turbo cold side outlet has peeling rubber exposed so I disassembled it and found a bad seal where my intercooler piping enters the turbo (could explain the boost drop) Everything else seems normal, no oil residue on the turbos (unlike my 4g63t with a 16g) and no lost fluids anywhere.

I'm still unsure about the white smoke. I just started and reved it and saw none. Well maybe a small amount but what seems to me as normal exhaust smoke. I did read somewhere that old gas can make a car smoke, I looked at the outer parts of the turbo seals and they all look pretty new in comparison to everything else on the car. I really don't want to pull these turbos off either because shes crammed in there.

The car has 150k on the body but 6k on rebuilt motor and at some point in its life it has the trans rebuilt and shocks replaced (so I was told)

So basically my question is what you guys think the white smoke was from? Valve seals? Bad tune? Bad gas? Bad turbo seals? Old carbon build up? Also just wanted to share my new badass car I just got

 

[abrmotorworks]

I have a 93tt and ur problem should be in the ignition coils.. replace all and do NOT use aftermarket coils.. use only factory coils.. while u are there replace wires and plugs I had the same issue a while back after the car sat for 6mos.

 

[911gdsmboostin]

white smoke can be a lot of things if valve guides were redone or rehoned too much could let oil in but if it got new seals at time I woulnt think it possible turbo seals if turbos never taken out and original and sat for long time my guess could be their but I don't own one either . like abrmotorworks said ive seen coils couse problems in a lot of other makes of vehicles some leaked oin down through valve cover and some somehow got coolant down their?? dono how but id try his idea first and go from their. good luck

 

[Codyvieth]

Have you done a compression test on it?

 

[06legacygt]

Could be valve seals. Could do a compression test but to really check the health of the engine I would do a leak down test. If you low compression it won't tell you much more then that but a leak down will tell you where the leak is coming from.