smoking

[need boost]

New motor still smoking but here is the wierd thing, you can crank it up cold NO smoke, going down the road NO smoke if you let it idle for about 10 seconds especially hot it will start smoking. When it does this you can pull the motor up to about 2500 rpm and the smoke is gone but let it idle and it comes back. I had a friend of mine tell me he had one do this one time and it drove him crazy till he found the intake gasket was the problem. At idle it pulled a hard vacume and it was sucking oil into a port but when you reved it up and held it the vacume in the intake was a lot lower and wouldn't pull the oil in. I am going to let it idle this weekend and get to smoking good then shut it off and pull the plugs to see if I can pinpoint which one it is going into but I wanted to see if you guys had any other ideas on it. I pulled the uppipe off and its dry as a bone so its not my turbo seals doing it. I also popped off a breather and made sure I didn't have oil filling up the valve cover and all was good there also. Thanks Daniel Ray

 

[NC87GN]

I had a bad set of rings do that to a fresh 2K motor. Plugs looked fine but I noticed after doing a leakdown it went from 4% (100miles) to 20% after 2K miles... It was also consuming a quart of oil every 500-600 miles. Hopefully your luck was better than mine..

Mike Banas
87Gn

 

[corsair231]

Does it smoke when you crank it just a few minutes after a hot shutdown? If it does it may still be valve seals/stems. Do you have a high volume oil pump? I had the same problem after a rebuild of mine. While I was researching I came across some information that said that a high volume pump may make the problem worse, especially on the exhaust side due to the stock exhaust valves having a scraper instead of a seal for oil control. Not sure what the GN1 heads use though. I pulled my heads and had them machined to add seals to the exhaust valves. I haven't gotten the engine back together yet but I hope it has cured the problem.

 

[need boost]

Ok got home tonight and I had to mess with it. Pulled the hose off for the pcv valve and plugged it. I did find a little oil in the tube but it didn't really make any diffrence but I did notice up in the shop that I didn't smell oil anymore? Now its putting off white smoke like its running lean. I did a lot on this motor that is diffrent than the one before. Now I am thinking that maybe the injectors are not firing clean or the chip is just not keeping up with the changes any ideas Thanks Daniel Ray