2008 Chevrolet Cobalt Exhaust problem?

Tiny
DVORAK1
  • MEMBER
  • 2008 CHEVROLET COBALT
  • 150,000 MILES
Had car on computer. Read bad cat 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 power steering light is on.
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Monday, July 15th, 2013 AT 12:27 PM

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Tiny
SATURNTECH9
  • MEMBER
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

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