2000 Grand Am no power. Knocking loud

Tiny
ASHLEY4768
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 4 CYL
  • 169,000 MILES
My car sometimes loses power. I cant go faster than 20-30mph. It makes this loud hard knocking. Ive had fluids checked. What could this be
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Thursday, May 26th, 2011 AT 4:18 AM

2 Replies

Tiny
FIXITMR
  • MEMBER
Do you feel any shaking or roughness when this happens?
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Thursday, May 26th, 2011 AT 6:37 AM
Tiny
ASHLEY4768
  • MEMBER
It does shake some. I usually know when its gonna start because it will idle real low, like 500rpm. Then when I pit it in drive it knocks real hard. Then I cant go faster than 20-30mph. I could hear and feel this hard bang every couple min. I took it to a few shops but it wasnt messin up at the time. Some one said it could b the cadilitic converter
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Thursday, May 26th, 2011 AT 4:05 PM

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