Question about 1990 Ford F350

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1990 F150 5.0 Engine no start

Truck was running great. It is a F150 with 5.0 engine and 4 speed manual tranny. It quit running and I had it towed home. I have replaced the coil, ignition control module. Plug wires have been recently replaced along with plugs and distributor cap. Still no spark to plugs.

What do you think is the most likely problem?

boregard9@comcast.net

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JUNK 150

Posted on Aug 24, 2008

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Not certain but I think your truck has no points (breakers) but a pulse transformer and a magnetic wheel to induce a pulse.

I suspect the pulse pickup has died.

If you have a multi (or ohm) meter, check the output leads for continuity.
If only one lead exits the distributor, then one side is grounded internally and you should measure between that lead and a clean ground; if two, then measure across them.

Typically, you will find somewhere between ~2,000 and 10,000 ohms.
It shouldn't be shorted or open (infinite).

It can also be easily checked on just about any engine analyzer as the purpose of the pickup is to produce a small pulse at the right point in time.

Posted on Jul 04, 2008

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