Engine knock at start up

Asked by Corvettes78 Jan 12, 2016 at 09:44 PM about the Chevrolet Blazer

Question type: Maintenance & Repair

My 2002 has a ticking knock when I first
start the car but goes away after warmed
should I be concernd

2 Answers
70,055

Kelly answered 8 years ago

yes..change the oil and filter and add some oil additive...like..lucas.

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60,305

Andrew answered 8 years ago

There was a thing gm called piston slap that occurred on the 4.3. They have gone for years like that but it sounds like crap when started cold and can last up to 5 min. But without hearing it is hard to tell you if that's it.

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