Question about 1999 GMC Sierra

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Ticking noise I have a low ticking noise as the crank goes around.. i dont think im going to throw a rod but i was thinking it could have something to do with the main bearing or the rod cap... anyone have a possible awnser...

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  • hunter08_194 Dec 14, 2008

    the ticking is underneath and my oil gauge is kinda jumpy. its only got 127,000 or so i knew it wasnt a rod and i wasnt sure of the bearing

  • hunter08_194 Dec 14, 2008

    its on the same side as the cam as well toward the 4 5 6 pistons

  • Richard Scordino May 11, 2010

    Have an oil pressurt gauge? Whats it say? Is the ticking louder underneath than from above? Rods have a sort of hollow knock. Crank bearings are more solid in sound... "ticking is generally valve lifters or worn camshaft & lifters. How many miles on this puppy?



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Ok, if you have it narrowed it down to a specific area, try narrowing it down further by using a long (2foot or more) extension or screwdriveras a "stethescope". Hold one one end against your head in front of your ear and probe different areas near the noise 'till you hear it the loudest, (I'm not kidding... this works) Be careful where you put the probe... the engine is running... stay away from drive belts and any other rotating stuff!
With what you have said, I'm sort of leaning towards a valve lifter at this point. PS: which engine is this?
The oil pressure thing concerns me... What is the exact pressure at idle hot and cold? what about at 1500rpm? If you have not been doing regualr oil changes, you could have something simple like gummy residue. If you have been using a high parafin based oil (usually really cheap stuff) this can happen even with properly timed oil changes. (once saw an engine with similar miles with enough sludge in it to make two softball sized globs just using what I found inside the valve covers, yet oil was changed every 3000 miles!) Though I don't like promoting products, I recommend changing your oil now, using any good synthetic and a pint of Marvel oil +good oil filter. (unless you have been using similar all along) See if after a few days the fluctuations in pressure and noise diminish somewhat. Get back to me on questions I asked.
Good Luck

Posted on Dec 14, 2008


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There is a knocking noise under hood think it may be a lifter is that something that can be fixed with out going to a shop?i put some lucas oil in it the noise stoped for a day our so i dont wount to have...

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Tapping noise

A tapping sound could be lifter tick, or rod knock... if it goes away, what you have is lifter tick, check your oil, low oil makes it worse.

Oil pumps up the hydraulic lash adjusters in your valve covers, at lower RPMs, the oil pressure is lower and will not fully pressurize them. Try holding your rpm at about 3500 or so with the car in neutral (parked) and see if it goes away, it should.

In later years (I think starting in 97 or so) mitsu started using a larger bore so called "third gen" lash adjuster. They don't tick as much, but they still do at times.

The good news, lash adjusters are not THAT hard to replace, figure a set of 24 will run you less than 150 in parts.

The better news, it doesn't hurt anything, as long as you can live with the sound, there isn't any reason to change them.

Good luck,
Iceman_ii on

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