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i have an 89' mustang 5.0...and the smog pulley doesnt move at all so i was wondering if the problem is the pulley or the pump itself?
 

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Welcome to the site,enjoy!!!! it is probably the pump.
 

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It's the pump. They lock up really easy, there's only 3 vanes in it and they tend to break, jamming it up. Or the shaft that runs through it rusts and then it locks up. A new pump costs only $50, that'd be better than fiddling with the old one.
 

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