[xj-s] 1985 Won't Start

85 XJ-s with spark, fuel pressure, new computer, still won’t
go. I have had it fire on starting fluid, but as soon as
that’s run it won’t fire. Any ideas will be appreciated.–
john hernon
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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In reply to a message from john hernon sent Wed 2 Jul 2003:

Check to see if the injectors are working. I hear a mechanics
stethoscope works well.–
The original message included these comments:

85 XJ-s with spark, fuel pressure, new computer, still won’t
go. I have had it fire on starting fluid, but as soon as
that’s run it won’t fire. Any ideas will be appreciated.


Ken Walsh. 1985 XJS
Mount Pearl, Newfoundland, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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At 19:49 2003-07-02 +0200, Ken Walsh wrote:

In reply to a message from john hernon sent Wed 2 Jul 2003:

Check to see if the injectors are working. I hear a mechanics
stethoscope works well.

Har! At least you didn’t include a comment about hearing the injector PULSE.

The original message included these comments:

85 XJ-s with spark, fuel pressure, new computer, still won’t
go. I have had it fire on starting fluid, but as soon as
that’s run it won’t fire. Any ideas will be appreciated.

Check the coolant temp sensor. The starting fluid has demonstrated that
your ignition is operational, so it’s obviously a fuel delivery problem,
and the coolant temp sensor seems to be the bugger that causes this most often.

Front of B bank (find the air temp sensor on the B bank air cleaner horn,
then look down on the head on that side, very near the thermostat
housing). Check it for an open condition ( = infinite resistance =
failed). You can temporarily bypass it with an appropriate-valued resistor
crammed into the harness connector.

On my website, I describe the construction of a simple switch gizmo to keep
in your toolkit (the one IN the car) to have available should this
component fail on you while you’re on the road.

http://jaguar.professional.org/
Sean Straw '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’ 65K
Marin County, California '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’ 210K
'69 Buick GranSport 455 V8 324K

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