XJ40 ( XJ81 ) 1986 - 1994

Intermittent start

Old 01-04-2019, 01:43 PM
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Default Intermittent start

My 1988 Vanden Plas, about every 20 times, won't crank on first turn of the ignition. It will eventually crank and start the engine, but only after turning the ignition switch on and off several times. I am pretty sure it is due to poor contact from ground to starter solenoid. The problem exists even though I have cleaned both battery terminals and the connection to the firewall. Couldn't I add a ground to the negative battery terminal and connect it somewhere on the engine? Will this work, or does the ground from the firewall have to connect directly to the starter solenoid? Any suggestions?

Last edited by Ernest Knox; 01-04-2019 at 07:34 PM.
Old 01-05-2019, 02:28 PM
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It sound like you are suspecting the starter. Seems reasonable, so I would reach down (or up whichever is easier) and check the hot cable at the starter. It could be corroded or loose too. Don't forget to unhook the battery though.
Old 01-05-2019, 03:39 PM
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I had the same problem and it was the ignition switch. Regards
Old 01-05-2019, 03:41 PM
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I would be inclined to check the solenoid spade connector to make sure it is making good, solid contact with the male terminal.
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