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Exhaust problem?

Tiny
DVORAK1
  • MEMBER
  • 2008 CHEVROLET COBALT
  • 150,000 MILES
Had car on computer. Read bad catalytic converter. Replaced exhaust from manifold to muffler. Replaced plugs. Replaced fuel filter. Still no power. Exhaust "puffs" so I put a paper towel at tail pipe, it blows out and sucks in. Valve problem? Note- transmission seems to stay in 2nd gear and speedometer doesn't work now. Also, the power steering light is on.
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Monday, July 15th, 2013 AT 12:27 PM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I would have it rescaned for codes especially since the speedo is inop. That will effect the transmission shifting. As far as the engine having bad valves you can check the valves with a vacuum gauge do a vacuum reading at idle. If the vacuum needle is wildly left to right you have a valve issue.
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Monday, July 15th, 2013 AT 2:58 PM
Tiny
DWATTS85
  • MEMBER
  • 2 POSTS
Exhaust fuse 10 amp
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Friday, August 25th, 2023 AT 9:49 PM
Tiny
DWATTS85
  • MEMBER
  • 2 POSTS
Pp blown exhaust fuse will cause it to bring up Kim and crank sensors mass air flow sensor low vacuum intake also O2 sensor codes make it misfire sluggish on take off once you get the speed it goes
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Friday, August 25th, 2023 AT 9:51 PM

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