1999 Jaguar XJ8 Excessive cold start cranking

Tiny
TROUTMAN1130
  • MEMBER
  • 1999 JAGUAR XJ8
  • 4.0L
  • V8
  • RWD
  • AUTOMATIC
  • 59,000 MILES
When the car sits overnight the first start up of the day takes about 3 to 4 seconds of cranking regardless of air temp outside. After the first start up of the day the car fires right up within 2 seconds of cranking. What could be causing this first start of the day to have to crank so long to start. The car runs fantastic but that first start of the day seems to be excessively cranking to fire up. It fires up nicely to, o issues with it dying out or anything like that but is does have a slight rough idle upon starting up then smoothes out within 15 seconds, idle is at the correct rpm's as well.
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Thursday, November 13th, 2014 AT 8:48 AM

3 Replies

Tiny
HMAC300
  • EXPERT
Check fuel pressure with a gauge it may be losing pressure should be 43.5 psi at idle should hold for at least 5 minutes within 5 psi after shutdown
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Thursday, November 13th, 2014 AT 9:35 AM
Tiny
TROUTMAN1130
  • MEMBER
If it turns out that it is losing pressure would replacing the fuel pressure regulator take care of that issue? Thank you for your help!
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Thursday, November 13th, 2014 AT 10:45 AM
Tiny
HMAC300
  • EXPERT
It probably would but there may be a check valve in pump as well but try regulator first.
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Thursday, November 13th, 2014 AT 12:16 PM

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