It even makes a back fire within the engine not out of the exhaust. Sounds like a poof or sputter. It seems to be getting worse after three weeks. A year ago the catalytic converter showed a low emissions on the emissions test.
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2005 Ford Taurus Question: Car surges all the time. Upon take off, speeding up or inclines.
Answer #1csubak30 December 18, 2011, 21:17Master
Sounds like cat is going bad and plugging up. The backfire could be pressure building up due to this issue and blowing out the flexpipe which will need replaced. Good way to check is to get your car up to operating temp. and put your hand about 3 to 4 inches behind exhaust pipe. If flow is restricted, the exhaust flow will be decreased and will be much hotter than it should be. If you have to move your hand because of the heat, it is too hot and cat. will need replaced. Also, check flexpipe for holes or breaks. When you are sitting at a light, the stronger smell of exhaust fumes will also tell of a break in the system near the engine in the area of the catalytic converter or flexpipe.