1997 GMC Jimmy V6 engine knocking as RPM increase.

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Geo4537
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Joined: Sat Jul 19, 2014 2:36 pm

1997 GMC Jimmy V6 engine knocking as RPM increase.

Unread post by Geo4537 » Sat Jul 19, 2014 2:51 pm

My engine starts to clack at about 1800 RPM and gets louder as the RPM's increase. The oil pressure is great when it's cold or driving but drops way down when idiling. There are no oil leaks or signs of burning oil and the oil level is at the full mark on the dipstick. Can anyone suggest what might be wrong?


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carriedi
Posts: 2266
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 1997 GMC Jimmy V6 engine knocking as RPM increase.

Unread post by carriedi » Sat Jul 19, 2014 6:14 pm

rod bearing or crank bearing might be bad. you should have a repair shop take a listen to verify if the engine is knocking or if they think it might be something on the top end. sometimes a cracked flex plate will make a noise that sounds like a knock.
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