No spark for hot start - '90 200tqw

Burl Vibert blur at
Wed Jul 25 22:04:18 EDT 2001

scott miller wrote:
> I’m getting no spark when cranking the engine when the engine is hot.  Once
> it cools to some unknown point, it starts immediately and runs great, and
> runs great when hot until shut off.  Thereafter, no start until cool.  No
> problem on recent cool day (70F), but consistent problem on warmer days.  It
> seems to be gradually happening when cooler.  Stock engine, no recent mods,
> repairs, damage.  Air conditioner has been intermittent.  Any thoughts?
> Ignition coil?  Hall sensor?  What components are specifically involved in
> starting, not involved thereafter, and could be heat sensitive?
> Is there an exorcist in the house?

I had a very similar problem recently, it turned out to be the crank
position sensor (ignition timing reference sensor).  It read the
required 1 kohm resistance when cold but went open when hot and the
signal died as well.  Took me a while to find that one.

Burl Vibert
1987 5kcstq
Kingston, Ontario

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