Posted by Derrick Gross on June 21, 2009 at 20:14:37 from (205.149.144.70):
Help..........I have a problem with my truck.
It's a 1996 GMC Seirra 2500.
It was in the shop about 1200 miles ago for some repairs, most of which were unrelated to the current problem; brakes, ball joints, ect. It also got a tune-up, some fouled plugs were replaced, and the oil was changed; which may be related to the current problem.
Yesterday, on the way to town, I noticed a clicking sound. On the way home it went away and everything seemed fine. No idiot lights, no abnormal gauge readings, no more noises.
Today, on a trip to my in-laws, the noise started up again. As the trip went on I noticed the oil pressure gauge bouncing up and down. By the time I got home it was dropping to zero but not staying there. The truck sat for awhile. When I started it again; that's right, I started it again without checking the oil....you can guess where this is going......the gauge read 0 for several seconds then popped back up to normal.
If the pressure gauge was up (40 or so) little or noise could be heard. The farther down the guage went the louder/more intense the noise gets.
At that point I finally decided it wise to check the oil so I pulled the dipstick............ NOTHING!
Okay, I know it was stupid to ignore the noise in the first place and I should have checked it out yesterday; but I didn't............
There are no obvious leaks. The valve coverers are clean, no oil drips underneath, or other obvious signs of oil loss. Of course I'm obviously not an expert. The one thing I did find is moisture inside the tail pipe. I rubbed my finger in there and.........black!
Is this a head gasket? If not what? Could this be connected to the work done on the truck last week? Any other thoughts, ideas, advice, suggestions or comments: other than I should not have driven it after hearing the noise.
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