Engine knock

1999 BUICK LESABRE
230,000 MILES • 2.6L • V6 • AUTOMATIC
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TANYAC
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I just bought the car listed above literally 3 days ago. although it had been sitting for a while started great ran great. Absolutely no noises. Last night as I was driving it started ticking only on acceleration so I immediately begin to find a place to pull off of the road, when I was almost stopped the car shut off and started smoking. It never overheated and I never smelt antifreeze. Once it cooled I checked the oil cap and it had bright yellow almost spots on the cap. so I pulled the dip stick but it did not have the gunk. I did not try to restart it. Can you please help me out? Thanks in advance
Nov 9, 2019 at 3:38 AM
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ASEMASTER6371
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Good morning,

Did any warning lights come on before you turned it off?

I need to hear the noise so I can help you. Can you take a video of the noise while it is running and upload it hear on this post?

Roy
Nov 9, 2019 at 4:56 AM
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TANYAC
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The check engine light came on and threw a code for the #2 cylinder and the gas cap earlier yesterday. I am waiting to get a tow dolly so it is still on the side of the road at the moment. It was a knocking/tick when i put my foot on the gas it started slow and speed up as I accelerated then completely stopped knocking when I let off.
Nov 9, 2019 at 5:10 AM
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ASEMASTER6371
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Okay, got it.

I need to hear it.

Roy
Nov 9, 2019 at 5:16 AM
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TANYAC
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Got the car home started right up no antifreeze on dipstick or inside engine. however, there is yellow slug on oil cap. What should be my next step to prevent further damage?
Nov 9, 2019 at 11:06 AM
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ASEMASTER6371
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You are going to need to change the oil and filter.

You will need to check the plugs for the misfire.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Check the compression as well.

https://www.2carpros.com/articles/how-to-test-engine-compression

I really need to hear this noise?

Can you also post a picture of the sludge?

Roy
Nov 9, 2019 at 11:32 AM
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TANYAC
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The sludge.
Image (Click to enlarge)
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Nov 9, 2019 at 11:34 AM
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ASEMASTER6371
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That is fuel mixing with the oil.

The noise?
Nov 9, 2019 at 11:36 AM
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TANYAC
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Right now it is mostly a belt noise, but the coolant leaked out somewhere. I don't know where. The dipstick does not smell like it's mixed with gas.
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Nov 9, 2019 at 11:39 AM
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TANYAC
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The dipstick looks like it is overfilled with oil.
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Nov 9, 2019 at 11:43 AM
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ASEMASTER6371
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Okay, thanks. That noise is not good.

You have an internal engine issue. It sounds like a piston or broken piston ring.

This is why I wanted to hear this first. I would do nothing now. You need to replace the engine or have it rebuilt.

Roy
Nov 9, 2019 at 11:43 AM
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TANYAC
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Well bummer. thank you
Nov 9, 2019 at 11:49 AM
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ASEMASTER6371
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Sorry for the bad news.

You are welcome.

Always glad to help.

Roy
Nov 9, 2019 at 12:04 PM