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1994 Mercury Grand Marquis Question: 4.6L plugs are black, runs rough with no acceleration

 

Question

Josephky, Essex, MD, September 11, 2013, 20:11
 Rookie

I changed the fuel Pump and got no good results.

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  • Answer #1

    csubak30 September 11, 2013, 21:08
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     Master

    Have exhaust system and cat. converter checked for possible poor flow\partially plugged condition. This will cause backpressure and poor running. Is your check engine light on?

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  • Answer #2

    Greg's Orange Auto (13485 Answers) , Orange, CA - (714) 361-9386
    globalhelper September 12, 2013, 06:07
     Master

    scan codes and post so we can adv. also ck fuel pressure,it may be to high due to bad fuel pressure regulator

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