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    Fuel pump causes engine knock?

    Engine knock Today I removed the Air Flow Sensor, cleaned the little wires with tuner cleaner, replaced it and now it feels like I have a new car. The pinging is completely gone, got a lot more power. How simple! Took ten minutes. I will be asking the service manager at my dealership how...
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    Fuel pump causes engine knock?

    Stupid question No.1, what's a MAS? I'll clean it if you tell me what and where it is. Thanks.
  3. P

    Fuel pump causes engine knock?

    Fuel pump and engine knock. Thanks Opera House for your suggestions! I'll try replacing the relay first, see if that makes a difference. One thing I forgot to mention in my original post was that just about a year ago I had all the spark plugs replaced(Platinum), the knocking went away for a...
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    Fuel pump causes engine knock?

    Can a faulty fuel pump cause engine knock? My 93 Explorer, with 137K knocks something awful on accelleration and has no power. Dealer ran diagnostics and found that fuel pump pressure is 26 instead of 30psi. Wants to install new pump, $380.00 bucks. The pump in the car is only two years old...
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