1987 F-150 weak spark

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Howard Mora - 19 Nov 2006 18:04 GMT

I have 1987 F-150 V-8.
The engine began to lose power, even when pushing more on the accelerator.
The spark appears to be weak.
Any ideas? I've replaced the coil, and checked the fuel flow from the fuel
pump. Thanks.

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lugnut - 19 Nov 2006 19:48 GMT

>I have 1987 F-150 V-8.
>The engine began to lose power, even when pushing more on the accelerator.
>The spark appears to be weak.
>Any ideas? I've replaced the coil, and checked the fuel flow from the fuel
>pump. Thanks.

Fuel flow will not cause weak spark. It will cause a loss
of power under power demand. Fuel flow without checking at
pressure as specified for your vehicle will not tell you
anything about fuel available to the engine under load. If
you have replaced the coil, I would check the voltage at the
coil. That vintage Ford did have problems with the ignition
control module on the distributor.

Lugnut

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David M - 19 Nov 2006 20:59 GMT

>>I have 1987 F-150 V-8.
>>The engine began to lose power, even when pushing more on the accelerator.
[quoted text clipped - 11 lines]
>
> Lugnut

Yup that's what I would suspect... TFI module. You can replace it
yourself, just be sure not to forget to apply the thermal compound on it
before you install it (the replacement unit should come with the compound).

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