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Car is a loud knocking

Tiny
TLANGE1226
  • MEMBER
  • 2001 CHEVROLET MALIBU
  • 220,000 MILES
When I start my car there is a loud knocking, it seems to lighten up a little after the engine warms up, but continues the entire time I am driving. Could this be caused by a faulty fuel injector?

I had the codes ran a few weeks ago and there were 4 codes that came up. 1- bad injector #2
2- faulty spark plugs (which have been changed since)
3- EGR valve
4- O2 sensor
Also, While my car is idling the smell of sulfur is overwhelming, is this caused by one of the above codes, and what can I do to fix it?

I am trying to figure out what would cause the loud knocking, and if I have more of a problem than what I think?

Thank you in advance!
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Wednesday, February 8th, 2012 AT 5:36 PM

3 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Check your oil is the noise high or low?
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Wednesday, February 8th, 2012 AT 6:43 PM
Tiny
TLANGE1226
  • MEMBER
  • 2 POSTS
Just had a oil change a month ago, and the knocking is high, like something is loose, not a ticking though.
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Wednesday, February 8th, 2012 AT 7:09 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Does it have oil?U may be talking about major engine or it could be something easyier hopefully
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Wednesday, February 8th, 2012 AT 9:59 PM

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