98 Ford F150 4.2 still won't run

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grdøg - 02 Sep 2005 09:49 GMT

Driving along fine when I suddenly have no power, check and sure enough
there is no spark, get that fixed and before I can get home it dies again
this time there is no fuel pressure. After changing the fuel pump and
filters it still runs rough. Have now changed the coil pack[twice], fuel
pump, ignition switch, the computer [three times], crank sensor [twice] and
the harmonic balancer it still won't run. Diagnostics says that everything
is fine and should run, but it doesn't. Dealer has had the truck for six
weeks now and still can't get it to run right. Now they "think" it might be
the wiring from the crank sensor to the computer. Dealer has changed the
coil pack, computer, crank sensor, and the harmonic balancer thinking each
will fix it and now want to change the wiring harness "thinking" that will
fix it. I am not wanting to pay for them "thinking" changing things I have
already changed or just changing another thing "thinking" it will fix it
when it doesn't. Does anyone out there have a real idea of what might be
wrong with this. It is a fairly new engine only 24,000 miles [previous
engine died at 78,000]. When I had worked on it the best I got was for it to
run rough but run fairly well with some popping at 2000 rpm, dealer now says
it doesn't run at all.

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Larry Suddarth - 02 Sep 2005 21:08 GMT

Had a similar problem with an old Audi. Replaced everything. It still quit.
Got the wiring diagrams. I finally had to run the wires. (Visually inspect)
I found wires that had rubbed together and worn the insulation off. This
caused the wires to short out. The most suspect places are where a wiring
loom might be vibrating, causing the wires inside to rub against each other.
Over time the insulation will rub off. I would bet that a good Ford mechanic
who might know exactly where to look to find the short. Performing drastic
surgery on your truck should be a last resort. I hope someone out there
knows a simple solution. BTW. I was so scared that Audi would quit, I had it
towed to every place where I tried to have is repaired. No one could fix it.
I just had it towed home and got in there myself and started ripping open
wire looms. I visually saw the problem. Good luck!!!!!

> Driving along fine when I suddenly have no power, check and sure enough
> there is no spark, get that fixed and before I can get home it dies again
[quoted text clipped - 18 lines]
> says
> it doesn't run at all.

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