Question about Ford Thunderbird

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Car back fires after I replaced fuel pump and new ig wires

My 1957 Ford Thunderbird V-8 Fuel pump is brand new. Ignition wires are after market and I guess I put the wires back to their places. (Mis-placed wires?) Carburetor is believed OK. Car runs smooth at idle. Didn't check timing yet, but I guess should be right. Yet, car back fires loud at test drive. Can you give me any idea?

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  • paul erickson
    paul erickson May 11, 2010

    you didnt mention if you replaced the points?

    it sure sounds like an ign problem

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Hi mnfchen, here is a little info for you,enjoy, on the 272-292 and312 cu.in the firing order is:

1-5-4-8-6-3-7-2 (from front to rear right: 1-2-3-4 left:5-6-7-8

spark plugs should be gapped @.035

timing is 3 deg BTDC for manual trans

6 deg BTDC on ford-o-matic

valve lash hot and @idle .019 in/ex

idle speed for manual trans is 475 rpm

idle speed ford-o-matic is 450 rpm

hope this helps you good luck :)

Posted on Nov 13, 2008

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· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

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