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Posted on Aug 12, 2010

I HAVE A 1996 JAGUAR XJ6 i AM SHOWING A MISSFIRING IN MY 6 CYLINDER. i JUST REPLACED THE VALVE COVER GASKET. MY IGNITION COILS HAVE NEVER BEEN REPLACED. COULD THE SIX CYLINDER MISSFIRE HAVE SOMETHING TO DO WITH THAT?

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  • Posted on Sep 07, 2010
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Yes, definitely. I just had the same problem on my 97 xj6... car was misfiring, running very rough at idle. My last ignition coil was bad. I had it replaced and solved the problem. Try it yourself first. The repair shop wanted almost $400 to get a new coil and replace it for me. I found a coil at familycar.com for $57. I pulled one coil out and the boot was slightly melted at the end. Be very careful taking them out as nothing is cheap on our vehicles... Good luck!

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Need to remove valve cover on 2000 Camry Toyota

For the four cylinder engine:

  1. Remove and label all electrical wiring, connectors and vacuum hoses necessary to gain removal clearance.
  2. Remove the spark plug wires. Disconnect the PCV hose.
  3. Remove the four nuts and grommets located on top of the cylinder head cover.
  1. Remove the cylinder head cover and the cover gasket from the cylinder head.
  2. Discard the gasket and replace with a new one.
To install:
  1. With a wire brush or gasket scraper, remove all the old gasket material from the cylinder head and the cylinder head cover gasket surfaces.
  2. When the cylinder head surfaces are free and clean, apply beads of sealant to the cylinder head in the locations shown in the accompanying illustrations.
  3. Install the new cylinder head gasket in the cover. Make sure that the gasket seats evenly.
  4. Place the cylinder head cover with the gasket onto the cylinder head.
  5. Install the four grommets and nuts. Uniformly tighten the nuts in several passes to 17 ft. lbs. (23 Nm).
  6. Connect the PCV hose. Connect all removed vacuum hoses, connectors and electrical wiring. Connect the negative battery cable.
  7. Start the engine and inspect for oil leaks.
  8. Repair any leaks as necessary.
For the V-6 (3.0L) engine:
  1. Drain and recycle the engine coolant.
  2. Disconnect the radiator inlet hose.
  3. Disconnect the throttle and accelerator cables.
  4. Remove the air cleaner cap assembly.
  5. Remove the V-bank cover. Use a hexagon wrench to loosen the nuts.
  6. Label and remove all emission control valve hoses. Disconnect any wiring interfering with the valve cover removal.
  7. Remove the air intake chamber. This will gain you access to the back valve cover.
  8. Disconnect the engine wire from the left hand side, No. 3 timing belt cover, rear side and right hand side. Most of the wiring is secured by nuts and or bolts to the body of the vehicle.
  9. Remove the ignition coils, make sure the place them in order on a table so not to mix them up.
  10. Remove the 8 bolts retaining the valve covers and gasket.
  11. Clean the mating area of the valve cover and cylinder heads well. If necessary, scrape any left gasket from either surface.
  12. Apply seal packing to the cylinder heads and place new gaskets into position.
  13. Attach the valve covers. Uniformly tighten the bolts in several passes to 69 inch lbs. (8 Nm).
  14. Install the spark plugs in their proper locations, then place the ignition coils into place and secure.
  15. Attach all engine wiring be sure to secure each harness properly.
  16. Install the air intake chamber. Refer to Fuel System .
  17. Attach all emission hoses and wiring.
  18. Attach the V-bank cover.
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I had a 94 XJ6 - given the amount of wiring in the dash and under the hood, you may need a dealer for this.
The first thing I would look at is all of the ground connections.
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Valve cover gasket, how to replace?

Rocker Arm (Valve) Cover REMOVAL & INSTALLATION 2.3L 4-Cylinder Engines
  1. Disconnect the negative battery cable.
  2. Label and remove the spark plug wires.
  3. Remove the attaching bolts for the valve cover.
  4. Remove the valve cover from the cylinder head. If necessary, lightly tap the valve cover with a soft hammer to aid in removal. To install:
  5. Thoroughly clean the valve cover and cylinder head gasket mating surfaces.
  6. Install the valve cover on the cylinder head using a new gasket.
  7. Tighten the valve cover bolts to 14 ft. lbs. (20 Nm) in a crisscross pattern.
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2.8L 6-Cylinder Engine
  1. Disconnect the negative battery cable.
  2. The following steps are necessary if your car has A/C and if you are removing the passenger side valve cover, if you do not need to remove the passenger side valve cover, skip them.
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  3. Remove the air cleaner-to-throttle body hose.
  4. Label and remove all necessary electrical and vacuum connections.
  5. Remove the attaching bolts for the valve cover(s).
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  7. Thoroughly clean the valve cover(s) and cylinder head gasket mating surfaces.
  8. Install the valve cover(s) on the cylinder head(s) using new gaskets.
  9. Tighten the valve cover bolts to 11 ft. lbs. (15 Nm) in a crisscross pattern.
  10. Install all necessary electrical and vacuum connections.
  11. Install the air cleaner assembly.
  12. Install the A/C bracket (if removed).
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  14. Connect the negative battery cable.
  15. Start the engine and check for leaks.
2.3L and 2.4L 5-Cylinder, and 2.9L 6-Cylinder Engines The 2.3L and 2.4L 5-cylinder, and 2.9L 6-cylinder engines have a two-piece cylinder head, the upper half and the lower half. The upper half is basically the same as a valve cover, except that it incorporates the bearing caps for the camshafts into the underside.
  1. Disconnect the negative battery cable.
  2. Remove the spark plug access cover.
  3. Label and remove the ignition coils and vent hoses or the distributor cap and wires if equipped.
  4. Check the cam alignment before removing the cylinder head.
  5. Remove the bolts attaching the upper cylinder head.
  6. Remove the upper cylinder head, lightly tap with a soft hammer if necessary. To install:
  7. Thoroughly clean the upper and lower cylinder head gasket mating surfaces.
  8. Apply liquid sealing compound to the upper cylinder head mating surface. WARNING
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  9. Place the upper cylinder head onto the lower cylinder head.
  10. Check the cam alignment before tightening the cylinder head.
  11. Install Volvo tool number 5454 or equivalent to the upper cylinder head.
  12. Tighten the nut on the tools to seat the upper cylinder head.
  13. Tighten the upper cylinder head bolts, beginning from the center out to 13 ft. lbs. (17 Nm).
  14. Install the ignition coils and hoses or the distributor cap and wires.
  15. Install the spark plug access cover.
  16. Connect the negative battery cable.
  17. Start the vehicle and check for leaks. Fig. 2: Remove the clamp and detach the vent hose 90953p66.jpg
    Fig. 3: Remove the spark plug cover and the plug wires or ignition coils to access the retaining bolts 90953p80.jpg
    Fig. 4: Remove the retaining bolts 90953p72.jpg
    Fig. 5: A light tap with a soft-faced hammer is usually required to loosen the valve cover 90953p81.jpg
    Fig. 6: Carefully lift the upper cylinder head up and off the lower section. Note the integral camshaft bearing caps in the casting 90953p82.jpg
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Where is the spark plug and wires located on a 95 Jaguar XJ6 model veh.? I just brought plugs & wires, and I can't seem to find where they go to. Ignition cap is not noticeable...can you help.

Thats funny. How does anyone sell you plug wires for a car that does not use wires? You need to keep out of the cheap auto parts stores. There are coils for each cylinder. The coils are under a cover at the valve covers. Be sure to use the correct spark plug. Denso 5304 or NGK 6962
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Oil all around spark plugs and wires 1995 4.0 jag sedan

the valve cover gasket is probably leaking into the spark plug wells replace the gasket and the plug well seals if they are seperate from the valve cover gasket
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ONE CYLINDER MISFIRING

No you don't have to drain the oil, however if there is oil down where plugs are then that may be the reason for the misfire the oil blocking the spark or may actually be the cause of the coil going bad. You have another problem that needs to be taken care of if not you will have the same problem again soon. You need to change the oil seals in valve cover gasket and valve gasket to stop oil from getting on plugs.Good Luck and thanks for using FIX YA
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