2002 GMC Yukon car noise

Tiny
JMUSAKA
  • MEMBER
  • 2002 GMC YUKON
  • 4WD
  • MANUAL
  • 170,000 MILES
Today, before I went to drive, turned my car on and it made this bang, but after it drove smoothly for a couple miles, but then made this pop and it started to sound like a can was being dragged on the ground, and then smoke came out, from the passenger side of the hood, and after it was later discovered that there was oil leaking? What could it be?
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Tuesday, November 26th, 2013 AT 5:48 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
You know we can't see or hear it so anything is going to be a guess, and it's going to be wrong. If I threw my dart at the answer board, it would say the oil filter ruptured, you didn't notice the warning light or gauge on the dash that the oil pressure was low, the hydraulic lifters started to clatter causing the tin can sound, but you kept on driving. The oil sprayed onto a hot exhaust manifold causing the smoke.

If I'm right, or something similar happened, it is possible there is no serious engine damage yet, depending on how long the engine ran with little or no oil pressure. When the warning light turns on you must stop the engine immediately, and coast to the side of the road. Major engine damage can occur in just a few seconds.

My second dart would say the serpentine drive belt snapped and you didn't see by the dash gauge that the engine was overheating. You have an engine problem but didn't say which engine you have, so I don't know how the water pump is driven. If it's driven by the serpentine belt, the engine would overheat and that smoke you saw would be engine coolant. It would expand into the reservoir where it would eventually overflow onto the ground. There's a much smaller chance of doing serious engine damage with that. Replace the belt, refill the coolant, and chances are that's all that will be needed.

You need someone to actually look at it to see what happened. Also, if the belt broke, you won't have power steering assist. That is easy to not notice at highway speeds but you'll definitely feel the hard steering at low speeds.
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Tuesday, November 26th, 2013 AT 6:06 PM
Tiny
JMUSAKA
  • MEMBER
Well the oil pressure was fine throughout when I drive it for those couple of miles, and the belt was fine, and we had changed the oil about 1 week before
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Tuesday, November 26th, 2013 AT 6:52 PM
Tiny
CARADIODOC
  • EXPERT
You need to have someone look at it. I'd love to offer a solution but without being able to look for where it's leaking, it's like asking your doctor over the telephone what to do about your pain. It could be a hang nail, a stomach ache, or you cut your foot off with a chainsaw. Without seeing it and with no other clues or observations, anything is a guess and that doesn't help you fix the problem.

The oil change could be an important clue. Sometimes the old filter gasket sticks to the engine and gets overlooked. That's called "double-gasketing" and we've all done it at least once. The new seal sits on top of the old one, but the old one usually blows out as soon as you start the engine. Sometimes it can take a while though. Usually you won't hear anything. You'll just see a huge puddle on the ground.
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Tuesday, November 26th, 2013 AT 8:22 PM

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