4.0 Running Rough....Options?
#21
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All though you replaced the rotor and dis cap may be check that the carbon tip in the centre of the cap is making good contact to rotor. they can some time fall out or stick up. May be also check the ground or earth wires at the base by ignition amplifier and the one connected to the airflow metre.
Thanks!
rj...
#22
![Default](/forum/images/icons/icon1.gif)
All though you replaced the rotor and dis cap may be check that the carbon tip in the centre of the cap is making good contact to rotor. they can some time fall out or stick up. May be also check the ground or earth wires at the base by ignition amplifier and the one connected to the airflow metre.
I got a third opinion and they came to same conclusion, it has spark from the coil but not at end of plug wires, and no obvious reason why?? odd.
Thanks!
rj..........
#23
#24
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Maybe I have missed something. Good spark from coil to cap, good spark out of the cap, no spark at end of wire. Do I understand that correctly? Because if I do, its the wire, regardless if they ohm out or not.
#25
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As of ignition module cutting in and out, I checked voltages across the ignition module plug. All feeds to module are good where voltage is specified in the test procedure. And although it does not give specific ranges, voltage is rising and falling correctly on designated wires in regards to testing with ignition off, on and cranking. Hopefully its working correctly all the time.
Will report back after get new parts, fingers crossed!
Thank You!!
rj.....
#28
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For what it is worth. My 1990 XJ40 stared with a very rough idle. A few seconds later teh idle returns to normal. Did all the usual things and the problem remained. My mechanic detected a clean cylinder head in No 1 cylinder and suspected a leaking head gasket. Having a more thorough inspection he detected a very fine mist in No 1 cylinder.
I Googled a solution and came up with K Seal. I read all the usual concerns and decided to use the product anyway. That was 3 weeks ago. Rough idle is gone, seepage in radiator overflow tank is gone. All is well until the next adventure.
In closing I noticed that my Owner's Manual (Yes the Jag still has one) states that when replacing coolant also include Barr's Leak. I wonder why that is?????.
Hope this helps.
TIG
I Googled a solution and came up with K Seal. I read all the usual concerns and decided to use the product anyway. That was 3 weeks ago. Rough idle is gone, seepage in radiator overflow tank is gone. All is well until the next adventure.
In closing I noticed that my Owner's Manual (Yes the Jag still has one) states that when replacing coolant also include Barr's Leak. I wonder why that is?????.
Hope this helps.
TIG
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