ncave Posted June 9, 2011 Share Posted June 9, 2011 Hey guys.....my z31 sbc project is throwing thru some loops and I'm wanting some insight. It's an 87-94 305 with an 86 tpi setup. Car runs well but blows more oil smoke than I've ever seen a car do. Bad enough I had it towed home from work. Just got the headers off and both cylinders 6 and 8 are just dripping with oil. All other cylinders are dry. 6 and 8 exhaust valves have 2 intake valves in-between them so I have a hard time Beleiving it to be a headgasket, cracked head, etc. Maybe a shared oil galley somewhere? Also have a hard time believing it could just be valve seals and guides on 2 side by side cylinders and not the others. ..... Gonna take some compression readings before starting the teardown to the heads..... Any ideas? Ty, tim Quote Link to comment Share on other sites More sharing options...
ncave Posted June 9, 2011 Author Share Posted June 9, 2011 Ok...... So my compression seems fine. Proceed with intake disassembly to find plenum full of tranny fluid...... Especially by the 6 and 8 runners, where the modulator line is. I've pulled the vacuum line off and it was dry, still is...... But also the only way tranny fluid would get in there. Quote Link to comment Share on other sites More sharing options...
jt1 Posted June 10, 2011 Share Posted June 10, 2011 Sure sounds like the modulator is bad and it's sucking trans fluid into the intake. Is the trans fluid down enough to tell? jt Quote Link to comment Share on other sites More sharing options...
ncave Posted June 14, 2011 Author Share Posted June 14, 2011 That's exactly what it was. Just got it all back together and took it for a short drive, runs great and the smokes gone. Now onto the next set "too dos" lol. Quote Link to comment Share on other sites More sharing options...
ncave Posted June 16, 2011 Author Share Posted June 16, 2011 Ok.... Next issue, for all you obi 1 guys. Runs well when started..... Good crosscounts, 1000k idle tho with no vacuum leaks (pcv valve plugged). My maf is reading around 2k - 2500 with or without it plugged in at idle,and around 1300 or so with key on engine off. Also got a paratic drain ..... Wiring maybe? Not sure y the PCM is seeing airflow with the motor off. Quote Link to comment Share on other sites More sharing options...
Nathan Posted June 21, 2011 Share Posted June 21, 2011 I would repost this on www.thirdgen.org They'll have an answer for you by Thursday I'd bet Quote Link to comment Share on other sites More sharing options...
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