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2000 Chevy Impala

Tiny
MRSJXN
  • MEMBER
  • 2000 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 191,000 MILES
I recently ran my car hot so I had to repair the heads, head gaskets, values, ect. Lots of work done to it. After the repairs my car is putting ( or kind of like a putt ) and runs rough while idoling or almost stopped. Its not knocking but kind of like a roaring putting sound. My car did not do this before. My mechanic can not figure out why.
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Wednesday, November 3rd, 2010 AT 12:29 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Coolant may have damaged CAT check exhaust back pressure
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Wednesday, November 3rd, 2010 AT 12:50 PM
Tiny
MRSJXN
  • MEMBER
  • 2 POSTS
Thanks for the quick reply, Docfixit Your reply was the CAT may be damaged from coolent check the back exhaust. What does CAT mean? And I stuck my hand by the back muffler to feel exhaust and you can feel it putting out. Its not blowing out a solid stream of exhaust. The exhust is putting out in sync with the putting sound my car is making. Does this sound like the problem you spoke of?
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Wednesday, November 3rd, 2010 AT 1:08 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
CAT is catalytic converter pressure gague can be placed into O2 sensor port. Or put a vacuum gague on intake port should be 17-29Hg. In. At idle raise RPM to 2000 if CAT clogged gague will drop towards 0
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Wednesday, November 3rd, 2010 AT 4:32 PM

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