Exhaust problem?

2008 CHEVROLET COBALT
150,000 MILES
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DVORAK1
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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.
Jul 15, 2013 at 12:27 PM
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SATURNTECH9
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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.
Jul 15, 2013 at 2:58 PM
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DWATTS85
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Exhaust fuse 10 amp
Aug 25, 2023 at 9:49 PM
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DWATTS85
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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
Aug 25, 2023 at 9:51 PM