87 XR4TI - TFI module, Knocking? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 3 Old 01-13-2014, 08:50 AM Thread Starter
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87 XR4TI - TFI module, Knocking?

My 87 Merkur XR4TI had a gray TFI and I was given a Black TFI module. Engine starts, but there is a loud knocking sound that sounds more like a lifter. Could the wrong TFI module be causing this?

Just FYI, I replaced the valve cover gasket with a blue rubber "permanent" type. After that, no spark, replaced the TFI and not the knocking....

Could the wrong TFI be causing this?

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post #2 of 3 Old 01-13-2014, 11:08 PM
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black is not the right one

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post #3 of 3 Old 01-14-2014, 09:06 AM
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You need a grey "push start" TFI module, not a black computer controlled dwell module.

Not sure why the knocking because it wouldn't change the timing, but it will run way too much dwell with the black module which can damage the module and the coil.

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