PointFiveO
Member
- Joined
- Mar 24, 2012
- Messages
- 71
- Points
- 70
Hi All, sorry to raise this issue as I know it has been raised in one form or other recently. Last week while driving my 500 which has a 650 engine with 123 electronic ignition I noticed after a short while that it was starting to run roughly and was noisy and quite jerky. I stopped and saw that the lead connected to the spark plug at the back of the engine bay seemed a bit loose, although connected you could wiggle the lead about a fair bit. On returning home I tried to tighten up the lead to no avail so changed spark plugs and leads. this seemed to run ok for about 5 minutes but as before once hot started to run erratically getting hesitant to the point of almost cutting out at times, hardly pulling above 5-10 mph and sounding almost like it was running on one cylinder. After some trawling through the forum and convinced it was a sparking issue I ordered a new coil, duly fitted it and started the car. To my amazement the car started first turn, previously it alway took a bit of churning and it also idled more smoothly and quietly than ever before. After letting it idle for 10 minutes to be sure no hesitancy was creeping in once warmed I decided it was safe to drive around the block. Again it pulled more smoothly and cleanly that it had in the last seven years since the engine was rebuilt. the sight jerkiness that was previously there while flooring the accelerator or lifting off abruptly, which I had put down to it having been fitted with a larger carburettor (weber 30 dic) during the rebuild, was now gone. Unfortunately after 5 minutes of trouble free driving the jerkiness and hesitancy started to return so I quickly returned home.
I'm now left wondering if the coil had been my problem or not. Is it possible for an ignition coil to run badly but still run? The car ran so much better than it had in years initially on the new coil that I was convinced that the old coil had been the issue. Could it be possible that the old coil was the issue but that the new coil became damaged after just 10 minute running? I've just read a thread that says you need to run these twin spark coils with a resistor and I don't have one fitted. However neither did the previous coil and it ran for 7 years. Sorry for the long winded ramblings, any opinions from the wise and experienced would be appreciated. My other thought as it runs ok until hot was that maybe it was an issue withe the carb; blockage/air leak...
Thanks,
Colm.
I'm now left wondering if the coil had been my problem or not. Is it possible for an ignition coil to run badly but still run? The car ran so much better than it had in years initially on the new coil that I was convinced that the old coil had been the issue. Could it be possible that the old coil was the issue but that the new coil became damaged after just 10 minute running? I've just read a thread that says you need to run these twin spark coils with a resistor and I don't have one fitted. However neither did the previous coil and it ran for 7 years. Sorry for the long winded ramblings, any opinions from the wise and experienced would be appreciated. My other thought as it runs ok until hot was that maybe it was an issue withe the carb; blockage/air leak...
Thanks,
Colm.