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Old 04-01-2012, 12:56 PM
 
Location: New Orleans, LA
847 posts, read 1,688,139 times
Reputation: 346
Default What kind of problem in this engine that is making this knock noise in the 1999 Yukon SLT?

?
Also, when I rev it up there's no noise. But when the vehicle is settled while the engine is just idling, there's a knocking noise.

And this noise is not that loud cause' the camera that I had is making it sound louder than it is when you hear it in person. So keep in mind.

with 3 megapixal camera
1999 SLT Yukon rev with Flowmasters - YouTube

with 12 megapixal camera
1999 GMC Yukon SLT 4-Door gmt400 start and rev with installed dual Flowmasters part 3(Please Rate) - YouTube
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Old 04-01-2012, 01:26 PM
 
Location: Midland/Dallas
4,047 posts, read 3,863,499 times
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Did this noise start before or after the new exhaust system?
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Old 04-01-2012, 01:50 PM
 
Location: New Orleans, LA
847 posts, read 1,688,139 times
Reputation: 346
Quote:
Originally Posted by SVTRay View Post
Did this noise start before or after the new exhaust system?
The noise started after the new exhaust system.

But I think the noise had started after about 2 years ago(2010) after I had took the truck around the block and had stepped on the gas a little hard just to race it around the block a little. And after I got in the driveway I heard the noise.

But I may be wrong, because my uncle told me that when he drove the truck and after someone had slammed into him from behind(note the rear bumper dent in the video) that it was something like a header problem or a manifold problem(This was before I had raced the truck).

My other uncle said that it might be a loose spring that needs to just be tighten.

But however I have no idea...
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Old 04-01-2012, 02:03 PM
 
Location: New Orleans, LA
847 posts, read 1,688,139 times
Reputation: 346
Quote:
Originally Posted by SVTRay View Post
Did this noise start before or after the new exhaust system?
Here's aanother video of me driving the truck around the block and coming back. This is with a 3 megapixal camera....
What is this knock noise in this 1999 GMC Yukon? - YouTube
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Old 04-01-2012, 03:20 PM
 
Location: Midland/Dallas
4,047 posts, read 3,863,499 times
Reputation: 2855
Quote:
Originally Posted by Blackandgold51 View Post
Here's aanother video of me driving the truck around the block and coming back. This is with a 3 megapixal camera....
What is this knock noise in this 1999 GMC Yukon? - YouTube
Sorta sounds like a miss but not sure.
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Old 04-01-2012, 03:25 PM
 
6,345 posts, read 7,004,621 times
Reputation: 5523
Default What kind of problem in this engine that is making this knock noise in the 1999 Yukon SLT?

That^^ reminds me of this

A lady calls the shop and says her car won't start. After the usual questions ( is it cranking over and not starting or is it not cranking over at all) she tells me it's cranking over but making a funny sound. Then she says wait a minute. I can hear her walking out the door. Next thing she's saying " OK honey, try it again and holds the phone out to the engine. Next thing I hear is the engine turning over but not starting. Then she says "what do you think it is and how much will it cost to fix it".

from Auto mechanics true life stories on customers
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