Question about 1993 Jaguar XJ6

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Engine is only running on the left side

I have a 1992 XJS 5.3 V12
The engine is very hard to start and will not idle above 800 at cold start. It will cutoff after a few minutes. The exhause on right side is cold telling me the cylinders on right not firing. The fault code showed the oxygen sensor on the right bank faulty. So far I have replaced that sensor and fuel filter. FuelPump is working but I have not verified pressure yet.I have disconnected the battery to reset fault. When I turn over starter I do get some dark smoke from right exhaust.

Bob

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  • Gizmo23 Sep 18, 2008

    I have fire but the plugs were very fouled. I did a compression test on one cylinder and it was about 14 lbs. All the other plugs were very black and crusty. I changed plugs and tried to start car. It was still very hard to start and when it did the cylinders were firing and cleaning out a lot of smoke on the right bank. It even idled at 13oo during warm up. After warm up things go bad again the engine idled lower and cut off. I cranked for a few minutes again and the car started a gin but was missing. I accelerated the throttle and it backfire. You can smell gas out of the exhaust and exhaust is not as hot as right side. What next?
    Bob Krainia

  • Gizmo23 Sep 22, 2008

    I was checking the compressions again and noticed the distributor cap was loose. All three screws were completely loose. I pulled cap off and noticed that the distributor has a 2 part rotor. The lower fires one side of engine and the upper fires the other side. Loose cap means bad contact. I ordered new cap and rotor today. It is logical to assume that is the reason right side did not fire all the time and cylinders were loading up with fuel. I did tighten old cap and the engine did run better but still not right. Contacts looked damage from hitting parts while loose. I will let you know later how it works.

    Bob Krainiak

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Replacing the distributor cap and rotor should solve your problem
with it loose it could not get the proper clearance and the damage to it sure isnt helping

Posted on Sep 22, 2008

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I think u can get this solution from this URL:

http://www.jaguarforums.com/m_41279/tm.htm

Posted on Sep 18, 2008

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Twin cam?
i really think your timing belt has slipped a tooth if its not firing on one side check
there is spark that side
fuel/gas going to that side
the leads,plugs are ok
even the distributor can be playing up but mainly the computer is telling it not to fire that side ...
'

Posted on Sep 18, 2008

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Im sure the oxy sensor is because the right bank is not running first you need to see if you are getting spark on the right side,
what im thinking is if you have spark you have a cam that has jumped and you could do a compression test to check.
lets check spark first
later
paul

Posted on Sep 16, 2008

  • paul erickson
    paul erickson Sep 18, 2008

    your compression should be at least 80 psi or better
    we need to check the other cyls. but i think you need to check your cam timing.


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