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posted by  Trev29 on  Sat Dec 1 00:57 CST 2007
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last visit: Fri Oct 17 05:56 CST 2014
[RELATED]

Look at the model number of the plug. eg. BPR6ES - the R means resistor. A non-resistor would be BP6ES.

The reason I brought the resistance problem up is because I have an '80 240. It was set up for non-resistor plugs. I purchased resistor plugs at the store because that was what the chart recommended for 240s. But the chart didn't take into account the changeover from non-resistor (early 240s) to resistor plugs (later 240s). The charts also were wrong for spark cables. So I had a lot of problems with hesitation and bucking on acceleration.

Check ngk.com, for example and look at the recommended plugs for earlier and later 240s.

It took me awhile to realize that the resistor plugs added an additional resistance (6k?) to the total. Platinum plugs also cause problems. So check the total resistance (cables and plugs) from the coil with an ohmmeter/multimeter. Some cables have resistance/radio suppression (carbon fiber core) others don't (copper core) but have resistor terminals. Mix/add too many resistances together and you (actually I) got problems.
--
1980 245 Canadian B21A with SU carb and M46 trans in Brampton, Ont.






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