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#4696414 - 03/16/18 08:17 AM 2000 5.3 knock, help diagnosing cause?
Mc357 Offline


Registered: 06/29/17
Posts: 30
Loc: CT USA
I have a loud knock at cold start up, or after sitting 6-8 hours on cold days.
the truck has over 180k miles.
The sound goes away within a few minutes. It sounds more like a knock than a lifter tick, and seems to deep of a sound for piston slap.
I am running 10w-30 Valvoline synthetic High mileage. here is a video of my truck the other morning.
thanks for any help

https://www.youtube.com/watch?v=nI0T4RsyoAw

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#4696421 - 03/16/18 08:23 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1577
Loc: wv
There are alot of threads on here and other forums..i have read about half of them. The consensus is pretty much replace all the lifters or just get used to it.. no ill effects other than just aggravating you to death.


There are also youtube videos of 'fixes' with MMO or ATF or Seafoam etc etc etc..



Edited by krismoriah72 (03/16/18 08:26 AM)

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#4696426 - 03/16/18 08:27 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
I thought that problem was limited to the 5.3 w/AFM. Guess not, thats the noise.. a lifter gouging a cam lobe.. Gotta fix it, can't live with.

Is there a check engine light on?
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4696429 - 03/16/18 08:29 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1911
Loc: SE British Columbia, Canada
I can see your pressure gage went up to just over 40 psi when you started the engine, which is good. I agree that is stronger than normal GM piston slap. Wondering if one of the lifters is bad.

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#4696430 - 03/16/18 08:30 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
But.. all GM engines have a bit of piston slap cold.. mine did that a little. Got the right oil and filter and its just about gone.

What oil brand and weight and what filter are you using?
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4696438 - 03/16/18 08:35 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
CT8 Offline


Registered: 10/09/14
Posts: 11239
Loc: Idaho
18 year old vehicle. Milk it.
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#4696442 - 03/16/18 08:37 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: LeakySeals]
Mc357 Offline


Registered: 06/29/17
Posts: 30
Loc: CT USA
Originally Posted By: LeakySeals
I thought that problem was limited to the 5.3 w/AFM. Guess not, thats the noise.. a lifter gouging a cam lobe.. Gotta fix it, can't live with.

Is there a check engine light on?

The check engine light comes on if I keep it above 2000 RPMs for very long so if I go down the highway and I go over 70 I will get a flashing check engine then it stays solid if it's very cold out and I'm going 35 or 40 I will also get a check engine if the RPMs go above 2000 for more than a few seconds the code is p0300 random multiple misfire.
I just put new iridium ac Delco in and it did not help

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#4696445 - 03/16/18 08:40 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: LeakySeals]
Mc357 Offline


Registered: 06/29/17
Posts: 30
Loc: CT USA
I am using Valvoline 10 30 weight high-mileage synthetic.
I just changed the filter the other day to a super tech cheap filter before that I had the AC Delco ecore filter in it the larger of the two
Have only put a couple of thousand miles on this truck since I bought it I was planning on doing frequent oil changes to see if that clears up the problem but it sounds a little louder than a lifter I thought

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#4696452 - 03/16/18 08:44 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
Char Baby Offline


Registered: 05/25/05
Posts: 10086
Loc: ROCHESTER, NY
Hmmm well, it could be piston slap as these engines(especially the larger 6.0/6.2L) were known for piston slap, usually earlier on than 180K miles.
But from the video, it also sounds to my ears like a bearing under the hood that goes away...IDK, alternator bearing and belt???


Edited by Char Baby (03/16/18 08:46 AM)
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#4696456 - 03/16/18 08:48 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
Chris142 Offline


Registered: 06/05/03
Posts: 16973
Loc: Deplorable in apple valley, ca
Short pistons rock in the bore till they expand. Nothing gonna stop that.
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#4696474 - 03/16/18 08:58 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
BAJA_05 Offline


Registered: 02/04/18
Posts: 389
Loc: Berks County/Pa.
I had drain back with Super Tech filters from day one -- went with a Fram Ultra and fixed it on my neighbors Ram. Those 5.3L motors are known for your noise -- I would still get that filter off moving forward.
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#4696479 - 03/16/18 09:06 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1911
Loc: SE British Columbia, Canada
It's worth trying 5-30 oil and a Fram Ultra. What was the temperature the morning you started it? I heard it was a bit cold in your part of the woods lately.

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#4696480 - 03/16/18 09:08 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Mc357]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
This is the collapsed lifter eating the cam lobe noise. Sounds more like belt squeal than a rattle or a lifter tick..

https://www.youtube.com/watch?v=Zlvz5oLESug
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4696484 - 03/16/18 09:11 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Snagglefoot]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
Originally Posted By: Snagglefoot
It's worth trying 5-30 oil and a Fram Ultra. What was the temperature the morning you started it? I heard it was a bit cold in your part of the woods lately.


I stopped using the Ultra on my 6.0 because piston slap got worse. I tried a better flowing lower efficiency filter and that helped a lot.
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4696487 - 03/16/18 09:16 AM Re: 2000 5.3 knock, help diagnosing cause? [Re: Snagglefoot]
Mc357 Offline


Registered: 06/29/17
Posts: 30
Loc: CT USA
Originally Posted By: Snagglefoot
It's worth trying 5-30 oil and a Fram Ultra. What was the temperature the morning you started it? I heard it was a bit cold in your part of the woods lately.


In the 20s I believe. 26 maybe?
I may change my oil again this weekend. It's a shame to dump oil under 3k miles. And I just bought 2.5 gallons of delo 10w30. But I can buy some 5w30 if it may help.
Maybe a napa gold filter?

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