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1. REMOVED INTAKES AND VALVE COVER TO REPAIR OIL LEAKS- ALSO…

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1. REMOVED INTAKES AND VALVE...

1. REMOVED INTAKES AND VALVE COVER TO REPAIR OIL LEAKS- ALSO REPLACED VALLEY COVER GASKET AND OIL SENDER
2. CAR RAN FINE ON TEST DRIVE – SAT 4-5 DAYS –STARTED MISSING ON TEST DRIVE BEFORE RETURNING TO CUSTOMER.
3. DISTRIBUTOR CAP APPEARED TO BE TRACKED BETWEEN #1B AND #6A – REPLACED DISTRIBUTOR CAP – GOOD TEST DRIVE
4. CAR SAT OVER WEEKEND – STARTED GOOD BUT STARTED MISSING AGAIN ON TEST DRIVE - REPLACED SPARK PLUGS AND IGNITION WIRES –TEST DROVE GOOD
5. NEXT MORNING WAS MISSING ON START UP – REMOVED SPARK PLUGS TO PRESSURE TEST COOLING SYSTEM FOR COOLANT IN CYLINDERS – (WEATHER COLD OUTSIDE) - NO COOLANT IN CYLINDERS FOUND AFTER OVERNIGHT TEST- VIDEO BORESCOPE SHOWS NO SIGN OF COOLANT WASHING ANY CYLINDER BUT SHOWS CARBON ON TOP OF PISTONS.
6. SOAKED CYLINDERS OVERNIGHT WITH SEAFOAM – BLEW OUT CYLINDERS AND REPLACED SPARK PLUGS- AFTER TEST DRIVE MISS SEEMED WORSE.
7. REMOVED SPARK PLUGS AND SCOPED CYLINDERS AGAIN – CARBON IS GONE – PREFORMED COMPRESSION TEST – RESULTS GOOD.
8. ENGINE VACUUM IS GOOD
9. PERFORMED CYLINDER BALANCE TEST WITH NO PROBLEMS FOUND
10. SMOKE TESTED INTAKE WITH NO PROBLEMS FOUND
11. REMOVED FUEL RAIL AND DROP TESTED INJECTORS – ALL GOOD
12. AFTER MORE TEST DRIVING MISS HAS BECOME A VIBRATION
13. REMOVE ALL BELTS – STILL VIBRATES
14. REMOVED TORQUE CONVERTOR BOLTS – STILL VIBRATES
15. HARMONIC BALANCER HAS RUBBER OUT ABOUT 3/16 ON ONE SIDE – SENT BALANCER TO BE REBUILT – STILL HAS VIBRATION
16. PROBLEM IS DEFINATLY A ROTATION VIBRATION- STARTS AND RUNS GREAT ON TEST DRIVE – VIBRATION INCREASES WITH RPM – DOES NOT GET ANY WORSE OR BETTER AFTER MULTIBLE TEST DRIVES
17. CAR ACCELRATES GREAT AND HAS PLENTY OF POWER – DRIVES GOOD OTHER THAN VIBRATION
John

Mechanic's Assistant: When it comes to this particular vehicle, have flat tires been a problem in the past?

Has nothing to do with tires. Are you reading the right post?

Mechanic's Assistant: What is the model/year of your Jaguar?

1989 XJS V12

Mechanic's Assistant: Are you fixing your XJS V12 yourself? What have you tried so far?

Worked on this before I closed my shop. Have been mechanic for over 30 years. Will try to copy history to this 1. REMOVED INTAKES AND VALVE COVER TO REPAIR OIL LEAKS- ALSO REPLACED VALLEY COVER GASKET AND OIL SENDER
2. CAR RAN FINE ON TEST DRIVE – SAT 4-5 DAYS –STARTED MISSING ON TEST DRIVE BEFORE RETURNING TO CUSTOMER.
3. DISTRIBUTOR CAP APPEARED TO BE TRACKED BETWEEN #1B AND #6A – REPLACED DISTRIBUTOR CAP – GOOD TEST DRIVE
4. CAR SAT OVER WEEKEND – STARTED GOOD BUT STARTED MISSING AGAIN ON TEST DRIVE - REPLACED SPARK PLUGS AND IGNITION WIRES –TEST DROVE GOOD
5. NEXT MORNING WAS MISSING ON START UP – REMOVED SPARK PLUGS TO PRESSURE TEST COOLING SYSTEM FOR COOLANT IN CYLINDERS – (WEATHER COLD OUTSIDE) - NO COOLANT IN CYLINDERS FOUND AFTER OVERNIGHT TEST- VIDEO BORESCOPE SHOWS NO SIGN OF COOLANT WASHING ANY CYLINDER BUT SHOWS CARBON ON TOP OF PISTONS.
6. SOAKED CYLINDERS OVERNIGHT WITH SEAFOAM – BLEW OUT CYLINDERS AND REPLACED SPARK PLUGS- AFTER TEST DRIVE MISS SEEMED WORSE.
7. REMOVED SPARK PLUGS AND SCOPED CYLINDERS AGAIN – CARBON IS GONE – PREFORMED COMPRESSION TEST – RESULTS GOOD.
8. ENGINE VACUUM IS GOOD
9. PERFORMED CYLINDER BALANCE TEST WITH NO PROBLEMS FOUND
10. SMOKE TESTED INTAKE WITH NO PROBLEMS FOUND
11. REMOVED FUEL RAIL AND DROP TESTED INJECTORS – ALL GOOD
12. AFTER MORE TEST DRIVING MISS HAS BECOME A VIBRATION
13. REMOVE ALL BELTS – STILL VIBRATES
14. REMOVED TORQUE CONVERTOR BOLTS – STILL VIBRATES
15. HARMONIC BALANCER HAS RUBBER OUT ABOUT 3/16 ON ONE SIDE – SENT BALANCER TO BE REBUILT – STILL HAS VIBRATION
16. PROBLEM IS DEFINATLY A ROTATION VIBRATION- STARTS AND RUNS GREAT ON TEST DRIVE – VIBRATION INCREASES WITH RPM – DOES NOT GET ANY WORSE OR BETTER AFTER MULTIBLE TEST DRIVES
17. CAR ACCELRATES GREAT AND HAS PLENTY OF POWER – DRIVES GOOD OTHER THAN VIBRATION
post.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No except thank you for any help you can give.

Submitted: 1 month ago.Category: Jaguar
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Answered in 21 hours by:
1/7/2018
Jaguar Mechanic: Daniel Wilson,
 replied 1 month ago
Daniel Wilson
Category: Jaguar
Satisfied Customers: 6,164
Experience: Owner at DJ Wilson
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Hi my name is***** will be glad to help if you still need help. Let me know if you got this resolved or still need help. I will be logged in between jobs as time allows. We can follow up as needed.

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