Is it a temp sensor that the computer is sensing and won't let
you burn up the engine ?

A sensor might be covered in oil / grime and gets hot and can't
cool easily.

I'd look at computer concepts and not mechanical ones. Today's
Truck/car has more and more computer controls and mommy may I stuff.

Martin

On 2/13/2013 7:25 AM, Steve W. wrote:
Mike Spencer wrote:
May I highjack this, since Gunner seems to have hit on a fix?

I have an '87 F-250 that won't start when it's hot. Let it sit days,
weeks, even months, indoors or out, and it fires right up. Even when
it's near 0F. Run it for a few minutes and it'll start again.

But run it until it get thoroughly warmed up, shut it off, and it
behaves as if it had a nearly dead battery: a-WUMP a-WUMP a-wump aaaa
clickety-click. Let it sit for 10 to 20 minutes (depending on the
outdoor temp) and it fires right up again. PITA at gas stations.

Engine is a replacement, the smaller-than-original V-8 (I forget the
name/displacement) so the truck is a bit underpowered but starts and
runs fine except for this not-when-hot thing. I'm a former mechanic,
I've taken it to a guy who's good, we feel like we've tried and/or
replaced everything.

Know any magic tweaks or arcane bits of Ford lore that might help me?


If it has the same style starter as a GM the problem is likely the same.
The starter solenoid is getting heat soaked and causing problems. The
trick on the GM units is to install a jumper strap across the large
terminals on the starter and install a Ford style starter solenoid on
the fender.