Mini Spares Articles - Ignition - Possible pre-ignition/pinking cause
Something that came to light during a conversation with a colleague and friend may be worth passing along.

It's one of those things that, once ingested, lurks in the dark corners of the mind until a pertinent situation comes along. Such a situation reared its head a couple of weeks back - so now's the time to spread the word before it disappears back into obscurity.

Engine's that run on or pink (detonate) for some seemingly illusive reason may well be suffering from a problem that causes an apparently correctly chosen heat range spark plug to run too hot. The problem is worn spark plug threads in the head. This reduces the heat-path required to cool the plug, consequently it over-heats and causes the aforementioned problems. So if you come across this one, check the plugs for fit in their threads. If they're loose, try the next heat range up!

10/09/2005

It's one of those things that, once ingested, lurks in the dark corners of the mind until a pertinent situation comes along. Such a situation reared its head a couple of weeks back - so now's the time to spread the word before it disappears back into obscurity.

Engine's that run on or pink (detonate) for some seemingly illusive reason may well be suffering from a problem that causes an apparently correctly chosen heat range spark plug to run too hot. The problem is worn spark plug threads in the head. This reduces the heat-path required to cool the plug, consequently it over-heats and causes the aforementioned problems. So if you come across this one, check the plugs for fit in their threads. If they're loose, try the next heat range up!

Importation rules regarding vehicles are very specific: Only those over 25 years in age may be brought in to the USA without compilance to Federal Motor Vehicle Safety Standards (FMVSS).

Author

Keith Calver