XJ40 ( XJ81 ) 1986 - 1994

1992 Vanden Plas

Old 06-26-2018, 10:03 PM
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Default 1992 Vanden Plas

we have a 92 Vanden Plas that has sat for some time now since the key was misplaced and had a new key cut. Battery also had to be replaced and she starts runs for a few seconds and quits. Is this due to an alarm cutoff (god knows where control went ifncar had factory alarm) or something else?

Anyone know now how to bypass or reprogram a factory alarm (which Iím assuming the car has) and I think it was a Clifford model.

Old 06-26-2018, 10:25 PM
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No, if alarm was active the car would not start at all.

Sounds like some other problem, fuel starvation comes to mind, but of course that's just a guess.

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Old 06-27-2018, 07:08 PM
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Originally Posted by Kitty kitty View Post
we have a 92 Vanden Plas that has sat for some time now since the key was misplaced and had a new key cut. Battery also had to be replaced and she starts runs for a few seconds and quits.

Hi Mike,

Welcome to the Jaguar Forums! It's great to have you with us.

Have you checked the fuel for water contamination? That's very common on XJ40s due to the horizontal orientation of the fuel filler cap, especially if the drain tube in the rubber gaiter around the fuel filler neck has become clogged with seeds, leaves, etc., allowing rainwater to pool around the filler neck. An easy way to test the fuel is to disconnect the fuel supply hose from the fuel rail, which is the connection on the firewall end of the rail. Aim the hose into a suitable catch container, such as a glass jar, and crank the engine long enough to collect a pint of fuel or so. Set the jar somewhere safe to decant for a few hours. When you inspect it later, two visible layers of liquid indicates water in the bottom of the jar. If you find water, the easiest way to drain the fuel tank is to connect a hose to the fuel hose you have disconnected and aim the other end into a 5-gallon gas tank, then use a large paper clip bent into a U to jump the fuel pump relay socket so the fuel pump will run continuously and pump the old fuel and water out.

There are other possibile causes of your symptoms but contaminated fuel would be the first thing I would rule out on a vehicle that has not run for some time.

Please visit the New Member Area - Intro a MUST and post a required introduction so we can learn something about you and your Jaguar and give you a proper welcome.


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