1981 Jaguar XJ6 Jaguar only running on 3 cylinders after ju

Tiny
DMBAUER
  • MEMBER
  • 1981 JAGUAR XJ6
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 116,500 MILES
I have a 81 jaguar xj6 4.2L strait 6 with dual over head cams in witch I restored I redid all the fuel systems and redid the whole car put many new parts on I have compresion spark and sufficient fuel pressure. I had the car running great I drove over 150 miles one day parked the car did absolutly nothing to it and started it the next day I was only running on the rear 3 cylnders the front 3 were no longer pushing out power or getting hot so I believe they r not running for whatever witch reason. Please I have tried everything.
Monday, October 18th, 2010 AT 9:06 AM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
First step is a compression test. Test all cylinders.
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Monday, October 18th, 2010 AT 11:54 PM
Tiny
DMBAUER
  • MEMBER
  • 2 POSTS
Have done compression test long time ago shortly after my engine started running like this. My compression is great on all six and very even
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Friday, November 5th, 2010 AT 1:30 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
OK compression is good, so that rules out a mechanic issue, so test for spark and fuel when the problem occurs, one of them is missing.
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Saturday, November 6th, 2010 AT 9:44 AM

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