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Valve seals problem?

danny_l_2005

Proven Member
511
1
Mar 23, 2004
weslaco, Texas
My car starts smoking (not much) when idling, so when i take off a puff of smoke comes out of the tailpipe. I also have an exhaust leak where the manifold and head are connected. At the leak there is carbon deposits around the area but also is oily. I haven't taken off my manifold for the fear of breaking another stud. But last time I took it off couple months the valves seem to look normal. Now for another question. My car tends to drop oil pressure on the expressway. When entering the expressway the guage is around 5/8 up but after driving a bit on the expressway doing 70 at 3k rpm it goes down to 4/8. Im very paranoid of the pressure because i do not want to rebuild my engine for the same cause all over again. Is it normal for the pressure to drop a bit because the oil is getting hotter? Oil i have on is 10w-40
 

spinninfwdlaser

Proven Member
418
0
Oct 25, 2004
Tellico Plains, Tennessee
I would fix my exhaust leak on a side note LOL. I just had to extract some bolts from the head, while it sucks, its not impossible. Anyhow, as oil gets hotter, it also thins. Oil pressure should climb 10lbs per 1000rpms on most gms, and I am not sure if this applies here. As for the puff of smoke, what color is it, black, blue, white?
 

danny_l_2005

Proven Member
511
1
Mar 23, 2004
weslaco, Texas
My broken stud is inside the head, and with it-it took a little prize, a broken ez-out extractor :D . The smoke is oil related which comes out as a light blueish color
 

JayRolla

Proven Member
5,630
32
Feb 23, 2006
Colorado Spring, Colorado
It does sound like your valve seals are bad. Thats why your smoking. A pre turbo exhuast leak is real bad, I would get that fixed ASAP. As for your oil pressure im not sure. My pressure drops on my guage only when im at idle.
 

spinninfwdlaser

Proven Member
418
0
Oct 25, 2004
Tellico Plains, Tennessee
DAMN, broke an ez-out.... Not good! Going to have to use a milling bit to drill through it, and retap the threads. Anyhow, (could be wrong here) a leakdown test detects these seals right? Dont want to lead you down the wrong path, but its worth mentioning. If I am wrong, I am sorry. As for the stud, is there any bolt sticking out, or is it flush? If some is out, weld a nut to it, and wheel it out with a socket. Good luck.
 

danny_l_2005

Proven Member
511
1
Mar 23, 2004
weslaco, Texas
As for fixing the stud, im taking that to a machine shop so they can do what they do best LOL it will be needing a heli-coil. I would like more info why a pre exhaust leak is bad other than making the turbo more laggy.
 

mkgearhead

Proven Member
101
2
Feb 19, 2005
Fort Morgan, Colorado
. Anyhow, (could be wrong here) a leakdown test detects these seals right? Dont want to lead you down the wrong path, but its worth mentioning. If I am wrong, I am sorry. As for the stud, is there any bolt sticking out, or is it flush? If some is out, weld a nut to it, and wheel it out with a socket. Good luck.

A leakdown test won't detect bad valve stem seals. It will tell you if the valves are sealing against the valve seats.
 
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