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XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

My 87 XJS starts and idles, but has no power whats so ever

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Old 05-10-2012, 09:36 AM
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Default My 87 XJS starts and idles, but has no power whats so ever
Wondering what it could be, I just purchased a 87 Jag XJS coupe that will start and idle , but once you go to take off , it seems that it can't get out of its own way, like it has no power or something
 
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Old 05-10-2012, 09:37 AM
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Its a V12 also
 
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Old 05-10-2012, 10:41 AM
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Off the cuff I'd say "lack of fuel".

Clogged filter, lack of fuel pressure.... throttle position sensor problem perhaps.

Was the car sitting unused for a long time before you got it?

Cheers
DD
 
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Old 05-10-2012, 01:07 PM
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Melted catalytic converters, they will do it.
 
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Old 05-10-2012, 01:18 PM
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yes it was sitting unused
 
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Old 05-10-2012, 01:55 PM
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i second converters. they dont just have to be melted. if theyre clogged then the engine just wont breath.
 
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Old 05-10-2012, 02:03 PM
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Originally Posted by 87jagcatxjs
yes it was sitting unused
Well, you gotta start somewhere so I'd pull the fuel filter (it's behind the spare tire) and empty the contents into a clean, clear container. What you see will dictate your next steps.

Cheers
DD
 
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