Question about 2002 GMC Yukon Denali

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Loud valve tap? sounds like a diesel motor...

I have a 2002 yukon Denali with 290,000 miles on a 6.0 liter v8...i cant believe how good this truck still runs! BUT it has a valve tap or some noise thats outa thus world...sound completely identical to a duramax diesel.Does this mean its almost the end of the line for my truck? Ive put some oil additives and they didnt work...please help!

Posted by sergio taylor on

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2 Answers

Mai Lor

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-Open valve cover and check it out. It's bend or out of adjustment. If it's bend then has to replace the valve
that make noise. If it's out of adjust or gap is too wide
then just adjust to the correct gap. you should be good to go.


Good Luck


Mai

Posted on Oct 25, 2017

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JonSnell Electronic

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Try setting the cams to the correct clearance. Maybe a worn cam.

Posted on Oct 25, 2017

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5 Related Answers

Anonymous

SOURCE: 2002 Yukon Denali will not start

I have the exact some problem 01 Yukon 5.3 – Sometimes my security light also comes on for no reason? Wonder if this has something to do with the remote starter? When this does happen all I have to do is wait for 15 minutes and it fires up just fine. Pisses me off though…

Posted on Sep 29, 2008

Anonymous

  • 56 Answers

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Posted on Jan 05, 2009

Anonymous

  • 102 Answers

SOURCE: Need color codes for radio in 2002 gmc yukon denali

2002 GMC Yukon Car Stereo Wiring Guide
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Posted on May 24, 2009

Anonymous

  • 5 Answers

SOURCE: 2004 GMC Yukon Denali Awd humming sound in front of truck

The Denali's are really susceptible to front dif. wear and failure. Because it is AWD, the front dif is always working unlike a 4WD. GM, in order to lighten up the front end built the front dif in aluminum. If it was the same as the rear, it would be bullet proof, but much heavier. After about 80,000 miles it is common to have bearings failing. Remove the drain plug which happens to be magnetic. You may see more than just the normal fine filings. You will likely see larger chunks of metal some of which is not even magnetic but will drain out with the oil. You are likely looking at a $1500 rebuild. It will get much louder and run for a long time before it really goes south.

Posted on Jun 21, 2009

riderss

  • 1 Answer

SOURCE: 2002 gmc sierra denali rear axle noies

I have a 2002 Sierra Denali, and when it was only two years old, I began having the same issue that it sounds like you guys are describing. Luckily, I had opted for the extended warranty, because it turns out that the lube "specialists" at Wally-World had topped off my rear differential with standard rear-end oil. I turns out that the Denali's differential has a special "clutch pack", as they called it, that requires a secial, senthetic (aka: very expensive) lubricant. The **** WalMart added contaminated the diffy's oil, and caused the clutch pack to fail.... basically it started locking the rear axles, and not allowing one side to rotate at a different speed than the other, as is required in turning.
Well, it took the dealer nearly a month to acquire the neccesary parts for the repair, and as for the cost? Only a minimal deductible, and the dealer assured me that the $1800 extended warranty had paid for itself.... nearly twice!!!
WORDS OF ADVICE: If you own a Denali with AWS, Always instruct the lube guys not to touch your rear differntial! And have your certified GM mechanic check it at recommended intervals.

Posted on Nov 03, 2009

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