Please Help Problems With Zip Zaps Performance And Booster Kit

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Hello My Name Is Vince I Live In Canada The Radio Shacks Out Here Closed Down And Changed To Circuit City They Were Selling Off All Their Zip Zaps For $ 3 .oo Canadian So I Bought 2 Se Initial D Sets And 2 Others Which Are At Work I Also Bought 2 Vette Body Sets And 2 Mercedes And Audi Sets , I Also Bought The Speed And Performance Booster Kits That Have 3 Separate Engines Rear Axles And Gears .
I Only Paid .99 Each For The Accessories And Am Buying All I Can Their So Cool . Heres My Problem I Tried To Switch Out The Normal Motor For Any Of The Other 3 That Came With The Cars On All 4 Separate Cars And They Don't Work Ami Doing Some Thing Wrong The Engines Fit Well The Cars All Charge No Problem But The Engines Wont Work They Make A Strange Vibrating Noise But Wont Spin The Steering Works No Problem And The Original Motor Also Works Please Help Thanks Im New To This Scale.