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1996 GMC Yukon Ticking

Tiny
CVSA78
  • MEMBER
  • 1996 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 126,241 MILES
I started the truck this morning (really cold) and the truck made the normal ticking. It usually goes away about 3 seconds after startup. But this time it stayed. Checked the oil. Fine.
40 LBS of oil pressure the ticking is from both sides of the motor on top (valvle cover). Do you think it's a lazy lifter? Would Marvel Mystery oil help?

Thx
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Tuesday, January 22nd, 2008 AT 6:08 PM

11 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Yeah lazy lifter. Try mystery oil, that should buy you some time. **Also check your intake gaskets, sometimes they leak coolant internally and can cause lifters to take a long time to pump up. Are you losing coolant but dont see a leak?
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Tuesday, January 22nd, 2008 AT 6:12 PM
Tiny
CVSA78
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I checked the coolant and all is fine, no sludge, and the overflow is full and the rad is full. Just an ungodly ticking.
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Tuesday, January 22nd, 2008 AT 6:29 PM
Tiny
MASTERTECHTIM
  • MECHANIC
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Are you positive its not an exhaust leak. These are notorious for leaking at the y pipe where it bolts to manifold. The bolts will be tight but the pipe is loose, and sounds exactly like a lifter. Check that before you go insane
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Tuesday, January 22nd, 2008 AT 6:35 PM
Tiny
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I'll check it out tommorw.

Thx
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Tuesday, January 22nd, 2008 AT 7:57 PM
Tiny
CVSA78
  • MEMBER
  • 9 POSTS
I finally looked a little deeper. Checked the exhaust/manifold/y pipe connections - all is tight.

Drained oil - looked ok - no metal, added 1 qt marvel mystery oil and new filter- No change

Removed serpentine belt to eliminate tensioner - no change.

The tick seems to come from both sides of the motor just under the valve covers?

I hooked up an external oil pressure guage - 55 - 60 lbs @ idle cold.

I just think the upper part of the engine is not getting oil.

Any ideas?
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Friday, January 25th, 2008 AT 6:25 PM
Tiny
MASTERTECHTIM
  • MECHANIC
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I have replaced alot of those sets of lifters and it always fixed the problem. Let us know
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Sunday, January 27th, 2008 AT 11:44 AM
Tiny
CVSA78
  • MEMBER
  • 9 POSTS
Pulled the intake and valve covers and 3 colapsed lifters. Waiting for parts, should have them tuesday.

Mike
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Sunday, January 27th, 2008 AT 11:52 AM
Tiny
CVSA78
  • MEMBER
  • 9 POSTS
I have never seen roller tip rockers in a truck from the factory. Any Ideas?
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Wednesday, January 30th, 2008 AT 8:14 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Roller lifters is what they use. Just to be sure, you did check to see that the camshaft lobes are not worn out.**Most likely they are not** but double check
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Wednesday, January 30th, 2008 AT 8:32 PM
Tiny
CVSA78
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Thanks, I checked the cam and all is fine. Got everything back together and sounds a lot better. I going to let it cool down and adjust the valves again.

Thank You for all your help

Mike
:D
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Saturday, February 2nd, 2008 AT 5:42 AM
Tiny
CVSA78
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Readjusted everything and it runs like a sewing machine. Nice and quote. Thanks Again for your help
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Wednesday, February 6th, 2008 AT 8:06 PM

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