1997 Chevy Silverado Knocking sound from engine

1997 CHEVROLET SILVERADO

10,658 MILES • V8 • 2WD • AUTOMATIC

DAN GREIF

MEMBER
1 POST

I notice just today when I cjecked under the hood as the engine was running there was a light to medium knocking sound comming from number six clylinder. It sounds like piston slap are maybe a rod bearing. This truck was bought new and I baby this engine with regular oil changes. Can someone give me some clue to this problem?

Thanks

Dan

Mar 2, 2010 at 10:57 AM

MHPAUTOS

✓Experienced Mechanic
31,937 POSTS

Hi there,

First check the engine oil pressure with a mechanical gauge, if this is all ok, you can try and prove which cylinder is affected my listing carefully and removing the injector plug, this will shut down the cyl and reduce internal pressure, if the knock decreases you will have found the cyl, if piston slap is the problem you should be getting a poor result with a leak down test on the suspect cyl, check these first.

Mark (mhpautos)

Mar 2, 2010 at 11:03 AM

FLYBOY165

MEMBER
3 POSTS

Need some additional information before I can give you an accurate answer.

For example, does the nock begin at a cold start and go away after a few minutes?

It could be almost anything. I do know however from personal experience that Silverados have issues with lifters.

It sounds like you have a single hydraulic lifter that is not filling with oil. The resulting sound is a fast knock.

Send me a PM with the details.

Mar 9, 2010 at 10:19 AM

🔧 Tools & Auto Repair Parts

Find automotive tools, diagnostic equipment, and replacement parts for your next repair.

Shop on Amazon →

Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Add a reply

Ask a new question

1997 Chevy Silverado Knocking sound from engine

Frequently Asked Problems for This Vehicle