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1998 Chevy Lumina Engine Scratching

Tiny
MAD KING
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 165,000 MILES
Hello,

it is nothing sirious, I hope, but when I give some speed the engine sounds like it is scratching or better rattling. I thought first maybe a loose exhaust clamp, but it isnt.

Does anyone have any idea what this can be and how I can fix it. It is annoying.

Thank you
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Tuesday, September 7th, 2010 AT 6:44 PM

7 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Rattling is normally pre-ignition, or fuel/air mixture ignites prematurely.

Try a tank of high octane gas, see if pinging goes away.

If it does this all the time, you can damage engine.
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Saturday, September 11th, 2010 AT 8:57 AM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Thank you for your answer, but it doesn't sound that it is coming from the injection, but more from the exhaust manifold.
The pinging would be coming more from the intake/outlet valves, tight?
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Saturday, September 11th, 2010 AT 9:15 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Pinging comes from piston, sounds like hitting a ball-peen hammer on a vice.

You may simply have an exhaust leak which can sound like a ticking noise.
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Monday, September 13th, 2010 AT 10:11 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Thank you. Can it come from the EGR?
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Tuesday, September 14th, 2010 AT 8:39 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
EGR leaks can cause it, the EGR meters exhaust gasses into intake to reduce NOX emmissions.

Too little flow will cause engine to run a little hot, too much will cause it to lose power and stall.
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Tuesday, September 14th, 2010 AT 9:27 AM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Thank you. I will check this out.
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Tuesday, September 14th, 2010 AT 9:29 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Thanks for donation, and keep us informed.
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Wednesday, September 15th, 2010 AT 7:32 AM

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