Smoking ZR1 - 1990

[HOTZR1]

In the last 5 years I've driven the ZR1 about 200 miles. I start it occassionally and have seen some blue smoke on startup and figure that's normal. The other day I ran it for about 20 minutes and there was quite a bit of blue smoke... to say the least, it just doesn't look cool!

I ran a compression test and here is the results:

Cylinder Dry Wet (tsp oil)
1 205 225
2 205 220
3 180 215
4 205 210
5 185 220
6 190 225
7 180 215
8 220 225

Service manual states 150-200 psi is acceptable and low to high within 25%.

I did a search for some insight on the smoking condition. There is a post regarding pulling the plenum and see if oil has accumlated in the "breather box" or that "seal at the base" of the breather box has gone bad which can cause loss of vacuum and some oil build up (PCV doesn't work effectively). If the PCV isn't working right it will smoke. Another mentions the PCV as it enters back into the injector housing. Oil can accumulate in there from the PCV, especially if it isn't functioning correctly.

Today I'll do a leak down test.

Does anyone have any additional insight to this smoking issue. Thanks Dave