Question about 1991 Ford F150

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Did tune up on my 91 ford f150 302 5.0L V8 4x4 pick up which included s[ark plugs and wires, cap and rotor, oil change, new oil and air filters...now it is riding rougher and worse gas mileage than before? what did i do wrong?

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Did you properly "gap" the spark plugs? many spark plugs have to have the ends properly "gapped" before installation, by using a "gapping" tool/wheel to properly space the arc gap to the correct distance.

if the plugs were properly gapped, or already came pre-gapped out of the box for your specific vehicle, then you may have air getting into the cylinders around the spark plugs. were you careful to properly tighten the spark plugs straightly into place, or is there a chance that you left one loose, or, even worse, cross-threaded one of the spark plugs?

Posted on Mar 26, 2011

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May need to go back and check your wireing on your plugs. Or you may have moved the timming just a bit when replaced the distrubter cap. good luck to ya.

Posted on Mar 26, 2011

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