Smokin' C5Z
Thread Starter
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
Smokin' C5Z
Ever since I bought my 01 z06 its consumed a bit of oil. Not terribly bad, but enough that I have to add about 2 quarts in between oil changes. Its also always smoked a bit from the exhaust when I snap into the throttle and run it up to 5500rpms. If I roll onto the throttle slowly I don't get smoke at all, and I was reading somewhere that if you roll onto throttle and get no smoke, but get smoke when you jab the throttle that you should replace valve seals.
You can kind of see it in this video, but if the lighting is right it seems much worse than this.
My question is what do you guys think? a compression test a few months ago showed good numbers, all very consistent with the lowest being around 165 and the highest around 175. I've been dreaming of a mild cam for quite some time (228r) and obviously new lifters/springs/valve seals/etc. At this point I could easily afford the work, and my clutch has never shown any signs of distress, fluid kept as clean and clear as possible. I don't drag race or anything, and I'm really easy on the clutch, so i don't think I would have any issues there.
I would really hate to do all this work and still have smoking issues though. What do you guys think?
You can kind of see it in this video, but if the lighting is right it seems much worse than this.
My question is what do you guys think? a compression test a few months ago showed good numbers, all very consistent with the lowest being around 165 and the highest around 175. I've been dreaming of a mild cam for quite some time (228r) and obviously new lifters/springs/valve seals/etc. At this point I could easily afford the work, and my clutch has never shown any signs of distress, fluid kept as clean and clear as possible. I don't drag race or anything, and I'm really easy on the clutch, so i don't think I would have any issues there.
I would really hate to do all this work and still have smoking issues though. What do you guys think?
Thread Starter
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
No Catch can right now, I pulled my vararam off to clean the TB and it was honestly almost completely dry. there was a bit of buildup, but no oil actually pooling. TB hasn't been cleaned or touched in well over a year when I last had it ported/polished. will post a pic of it when I get the chance.
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No Catch can right now, I pulled my vararam off to clean the TB and it was honestly almost completely dry. there was a bit of buildup, but no oil actually pooling. TB hasn't been cleaned or touched in well over a year when I last had it ported/polished. will post a pic of it when I get the chance.
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Joined: Mar 2015
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Compression tests alone don't always tell the whole story.
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Joined: Mar 2015
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Pulling the intake on theses cars is simple, you could do that and look at the top of the intake valves, if they are covered in coked up oil deposits you found the issue.
The leakdown test would tell you the issue is not rings but I'm betting with the way you describe it, it's valve seals.
Thread Starter
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
I'm starting to wonder if my tune just isn't rich up top at full throttle or something. I did quite a bit of testing today and no matter what any time I made it smoke it was black, not blue at all. Since I've had the car it's been dyno tuned twice, and the tuner said all looked good, but I don't necessarily trust the shop that tuned it.