Blown coil again
Discussion
GreenV8S said:
Are you sure you're using the correct spec coil? For example, a ballasted coil wouldn't last long in a non-ballasted application. Anything you do that is unusual - leaving the ignition switched on with the engine stopped, for example?
Hi GreenV8S could you expand on the last bit, as I often leave my ignition on after stopping my engine to allow the fan to cool down the radiator,Was the car running OK when you had the coil changed, have you fitted new plug leads ?
As for blowing coils might be worth changing the king lead from the coil to the distributor, the failure has more chance to be caused by the high tension side due to the high voltage involved, Just wondering what would happen if the coil could not discharge its spark/current fully due to high resistance on the lead, anybody know, can it create problems ?
Phil
Sorry chaps leaving the ignition on without the car running does nothing to the coil on this ignition system the live+ reaches the coil but the switched -side is dead till its cranked(as in most cars with electronic ignition)this does not include old points motors(that does do coil overheat damage)possibly the wrong coil application it sounds like.
That Daddy said:
Sorry chaps leaving the ignition on without the car running does nothing to the coil on this ignition system the live+ reaches the coil but the switched -side is dead till its cranked(as in most cars with electronic ignition)this does not include old points motors(that does do coil overheat damage)possibly the wrong coil application it sounds like.
You *should* be right, but I'm not completely convinced. I'd expect the dwell limit to cut power to the coil after a fraction of a second, but I've seen some cases where the coil seemed to be drawing power for much much longer than this. Hence, if the OP was in the habit of leaving the ignition on with the engine stopped I'd wonder whether the coil may be powered up and overheating and causing the premature coil failure they're seeing. Even if theory says it shouldn't matter.Hi chaps, thanks for the replies. Answers to you questions are:
Only ever use expensive Bosch ones. Although I don't know there are different types of coil before. It has to be the correct one. All the TVRs in HK are service by the same person (TVR certified). All the other cars has the same coil and only mine get blown over the last 10 months.
Ever since I was driving, I was told not to leave the ignition on after stoping the engine as it will blow the coil. So I do not do that ever.
I did change the HT leads about 18months ago to something call Hotwire. These are high performance/racing leads from the US and they seem to perform ever better than my old Maglicore ones (sorry, can't remember the exactly how to spell those. But this is the best one that you can get in the UK). These leads also comes with individual grounding. Again all the other TVRs use the same leads.
My chim always run like a dream and never have any problem. The night before, it was running as sweet as ever. The next morning, there was no ignition. Coil blown. After changing it, the chim was running as normal. Every time is like this.
Any ideas
Only ever use expensive Bosch ones. Although I don't know there are different types of coil before. It has to be the correct one. All the TVRs in HK are service by the same person (TVR certified). All the other cars has the same coil and only mine get blown over the last 10 months.
Ever since I was driving, I was told not to leave the ignition on after stoping the engine as it will blow the coil. So I do not do that ever.
I did change the HT leads about 18months ago to something call Hotwire. These are high performance/racing leads from the US and they seem to perform ever better than my old Maglicore ones (sorry, can't remember the exactly how to spell those. But this is the best one that you can get in the UK). These leads also comes with individual grounding. Again all the other TVRs use the same leads.
My chim always run like a dream and never have any problem. The night before, it was running as sweet as ever. The next morning, there was no ignition. Coil blown. After changing it, the chim was running as normal. Every time is like this.
Any ideas
Edited by winston lai on Saturday 9th June 11:53
Have you had the 'faulty' coils tested to see what's wrong with them? Firstly, this might give some clue to what caused the failure. Secondly, it may be that the diagnosis of a faulty coil was wrong and actually the fault is elsewhere, for example a break in the wiring loom which is disturbed when you disconnect the coil, or something else that is being disturbed during the investigation. Gut feeling is that the coil is not the root cause of the problem.
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