RoadTest

Hey this is my first post..Have a 3.3l pathfinder have almost new belts , water pump ..changed radiator fluid and ususal maintance,,,new plugs..keep oil changed every 3,000 miles with 10w30..In the last week when the engine is cold like first start it makes a knocking noise..oil is ok no leaks...I live in florida so weather isn t an issue..
after it runs for a minute or so the knocing stops..I have looked at the engine visually it looks like it is coming from the left side ..being fairly causious I hope it is not the valves starting ...should I change type of oil first or just take to my mechanic and let him put the fear in me..???? I can tguess on what it might be since it stops in a short period of time other than bad gas ..looking on the good side..Hav eput new air filter to start...\\\ It has 120,000 miles to date on odometer..thanks Mary

aaronford

That sounds like a broken manifold stud, but that typically makes a ticking sound, not a knock.

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Aaron Ford
95 2WD Nissan PU E
2002 Oldsmobile Intrigue GX
"The hard part about playing chicken is knowing when to flinch" Scott Glenn in The Hunt for Red October

SPEEDO

you may have a lifter going out, if its "knocking" the lifter lost pressure or "leaks down", then when you start your vehicle the lifter has to "pump up" and will quit "knocking", make sense?

RoadTest

Hey on that engine noise my manifold was cracked ...knew it was in the exhaut somewhere but found a good one hope it works...using less gas now the sensor will recognize it...thanks