wot smoke
07-23-2012, 12:24 AM
#1
wot smoke Randomly when i get on it I have been told my car smokes out the exhaust. I have noticed it for the first time tonight. The motor has only 70k on it and seems like it runs strong. One thing it does do fhat is probaly the prob is suck a lot of oil through the ls6 pcv. I do have some pressure in the crank case though. What should I test for? I was planning on h/c soon but if the motors shot is rather not waste my noney
07-23-2012, 01:29 AM
#3
Mine used to do that too and on start up. I had no pcv valve though and had the line still going to the intake from the passenger side head. The oil in the intake actually messed up my map sensor.
07-23-2012, 09:19 AM
#4
Compression and leak-down tests are where I would start first as well. If everything is good, I would then look into a pcv setup, but my best guess says you will probably find something when testing.
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07-23-2012, 09:28 AM
#5
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What color and how much smoke? My wife told me the same thing after I went WOT down a back road a couple months ago. I freaked out and researched and found a ton of people have the same issue, as long as it's not billowing out in a big cloud. Mine just puffs a little bit of white/gray smoke at high rpms, or between redline shifts
07-23-2012, 01:41 PM
#6
It's never on start up and random. I have to rev it up near redline for it to happen and I can't tell the color of the smoke as it never happens. Imo its something with the pcv as my intake is soaked in oil literally. And i burn a lot of oil between oil change but ill do a leak down and conpression tn and let you guys know what i come up with. The car did sit for the last 5 years behind a building so it definitly could be valve seals. Also what's the proper way to do a leak down test?
07-23-2012, 02:00 PM
#7
Honestly, mines has done this ever since I swapped the motor into the RX-7. It's only when I really get on it at WOT. I have done leak-down and compression test and get about 155-160 across the board. I don't remember what the leak down results were but they weren't bad. You should still do the tests to make sure though.
To do a leakdown you need a compressor and a leakdown tool. You pump a specific psi into the chamber at TDC(if memory serves) on the compression stroke and the gauge will tell you the % of air that is leaking.
If you are running a little rich it could be carbon build-up freeing itself out of the exhaust. My passenger bank was running a tad rich due to injector imbalance and the cat was black whereas the cat on the driver side was clean.
To do a leakdown you need a compressor and a leakdown tool. You pump a specific psi into the chamber at TDC(if memory serves) on the compression stroke and the gauge will tell you the % of air that is leaking.
If you are running a little rich it could be carbon build-up freeing itself out of the exhaust. My passenger bank was running a tad rich due to injector imbalance and the cat was black whereas the cat on the driver side was clean.
Last edited by Exidous; 07-23-2012 at 02:12 PM.
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07-23-2012, 05:48 PM
#8
i have no cats, egr, or emmissions equiptment in the car if that makes any difference. i tried to use the compression tester you rent from auto zone on two cylinders, neither one would rise up past 30psi or hold any pressure at all. i think the guage might have been bad. and both plugs had a greyish build up on them.
07-24-2012, 02:12 AM
#10
i have no cats, egr, or emmissions equiptment in the car if that makes any difference. i tried to use the compression tester you rent from auto zone on two cylinders, neither one would rise up past 30psi or hold any pressure at all. i think the guage might have been bad. and both plugs had a greyish build up on them.
08-11-2012, 12:59 PM
#16
Something else I forgot to mention the inside of the exhaust and near each exhaust flange its soaked and solid black. And all the plugs are clean. So its gotta be a vlave guild or seal on one of the exhaust valves. I couldnt do a compression test, Idk how the hell I'm supposed to screw that line in it seems like its physically impossible
