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94 F-150 Ignition troubles

I have a 94 F150 4.9L, Auto tranny. I have had igniton problems finally took it to the dealer and after about a week I got it back. The dealer changed the ICM and the truck has ran fine for about 1.5 months now, 90% of the time the engine turns over normal but will not start, I can pull the SPOUT (shorting plug) out and it will start. I reinstall the SPOUT and the RPMs increase and the truck runs great. I am wondering if the ICM has gone bad or if the problem is in the computer or distributor. I tried to do some checks using a Haynes manual today but of course it started fine everytime. Has any one ever heard of this?

Reply to
Tim Lawson
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You may have a bad coil or coil wire which cannot provide the juice when the timing is normal. Removing the spout connector retards the timing to the base position. Also, a bad coil or coil wire can cause the ICM to fail which you have already replaced. Just because the coil has a long enough spark does not mean it is OK. The spark should be nice and blue - not orange or red. If that is the problem, the ICM may be bad again.

Reply to
lugnut

Reply to
Tim Lawson

It's easy if you have the scope but, as a DIY'er, the only thing you can do is judge it's color and spark length based on eyball experience since the engine does seem to run wiht it once it starts. E coils for the Ford can be found relatively cheap at $12 - $15US at places like Advance Auto up to around $100 at Pep Boys or a dealer. I would be tempted to throw a cheapie in there with a new coil wire just to see what happens. They are easy and quick to change with minimal tools. I have had several test OK but, wouldn't light the fire in the engine.

Good Luck!!

Reply to
lugnut

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