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1998 Jaguar XK8 hot restart

Tiny
WALT VAN COURT
  • MEMBER
  • 1998 JAGUAR XK8
1998 Jaguar XK8 V8 Automatic 125000 miles

I had the transmission rebuilt then noticed a restart problems when engine is hot. This was a everday problem. Back to shop and tech's had no luck. Got them to replace starter. Problem went away few weeks, twice in two months. Each time I would open hood and wait 10 or minutes and restart right up. Recently problem occurs after a long run 20 to 30. Minutes on every restart. Gave to machanic and he thought maybe throttle body at first. He got jag software but still could not pinpoint. Said could be relay on sensor? I swap out ignition relay with horn, didn't fix. So back to square one. Won't restart when hot until I give it time to cool down. Jag bullitin # 30339 might be related. Any help appriciated. Walt van court
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Sunday, June 13th, 2010 AT 3:12 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Im a little confused, does it turn over but not start, or not turn over at all?
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Monday, June 14th, 2010 AT 10:50 PM
Tiny
WALT VAN COURT
  • MEMBER
  • 2 POSTS
Yes it turns over then goes into fail safe mode. Then I wait for it to cool off then stars right up. In 50 times this happen once it started and. I drove to a shop and the rpm's were all screwed up jumping around. Put in park and then it killed. Machanic said it stared the next day and everything looked normal. Walt
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Tuesday, June 15th, 2010 AT 5:27 AM
Tiny
2CARPRO JACK
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Sounds more like a cam or crank sensor may be shorting out when hot if the tach was jumping around. That Jag bulletin is for a fuel pressure issue which wont cause the tach to jump, just prolonged cranking due to over-rich condition. Sometimes when they do stuff like this, it becomes a trial and error situation. Did the techs let it get hot so they could recreate the situation? It sounds like it does it pretty consistently, they should be able to get it hot enough to not start so they can watch on the scanner to see what isnt working.
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Tuesday, June 15th, 2010 AT 7:39 AM

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