CAR smoke

[BUICKTR]

A couple of weeks ago I took my car out for some test tuning. I have a new rebuild motor w/billet caps, stock heads upgraded springs, 50 lb inj, 340 pump, adj fuel reg, 20 row IC, and a TA 52. I made a few passes at around 22 lbs of boost. Car felt very strong, but I notice some light smoke. It was night time so I could not tell what color it was. As I went home and pulled up into my garage the smoking was bad. It filled up my garage with smoke so I shut engine off. I check my dip stick oil was perfectly clean and no bubbles, also my coolant tank was at full mark as it always been. My first plan was to check the turbo and I notice alot of play in the exhaust wheel. I didn't see any oil in IC, but there was some burn looking oil in the Thottle Body. Didn't see any oil in THDP and if there was any it probably was evaporated we the car was hot. Also that night when this happened car never got hot it was around 173 temp. Scanmaster showed my O2 were at 802 and 0 knock when I made these test runs. had good fuel in car. I went ahead and ordered a TA-62 from John Craig should be arriving soon. Hopefully it was just the turbo. If not I don't know what else would of cause this smoking. Any comments I'll appreciate.

 

[timothydog]

Before you pitch that turbo...

My gut feeling is that your PCV valve is sucking oil into your plenum through the vacuum block. Somehow under boost conditions you are getting oil in the vacuum line. So when you slow down and your lines go from boost to vacuum, all that oil gets sucked right in. I have this same problem. I can get on it a bit and then about 3 minutes later I will notice smoke when I'm sitting and idling. If I drive around without boosting the smoke will eventually go away.

I would make sure you have a good GM PCV valve and also you might want to look into a PCV check valve that you can buy through ramchargers.com. This is sort of a secondary PCV valve preventing boost from going into the crank case.

 

[BUICKTR]

timothydog

I do have a GM PCV valve and a check valve from Kirban. But I went ahead and check and saw evidence of oil in the vaccum line from vacuum block to the check valve. Why would there be signs of oil there. Should I replace them or just plug it up since I have 2 breathers on the car.

 

[timothydog]

I thought about unplugging my pcv myself but many others on the site will warn you not to run it like that. Without a vacuum sucking the exhaust gases out of the crankcase you can expect your oil to go bad sooner and the inside of your engine to get coked up real quick. Apparently breathers aren't enough to vent the gases.

Some guys run a small fuel filter inline with their vacuum line to stop the oil from going in. I haven't tried this yet but it sounds like a good idea to me. I think it was a Fram G3 fuel filter.