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The earlier 1999 Discovery uses NGK BKR6E plugs or equivalent and the gap is 0.8 mm (0.025"). The later 1999 Discover uses NGK PFR6N-11 plugs or equivalent and the gap there is 1.1 mm (0.043")
It really depends on the spark plug being used. But if you stick to the origninal spark plug NGK TR5A-10 it is supposed to be gapped a 1.0 mm since Ford has issued an in house service directive to reduce the gap from 1.3 mm (original) to 1.0 mm (present) 0.03936996
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to replace spark plugs remove spark plug wire boots. use special sparkplug socket or else you can break the sparkplug. to remove turn ratchet counterclockwise remove all four one at a time, make sure that the sparkplug gap is correct. most plugs come pregapped...read the box it will tell.you. do not overtigheten plug once it has fully seated give it a good snug....if you do one at a time you dont need to mark the spark plug wires. if you mix up the wires your car will back fire which could cause severe internal damage.
You are correct in saying the gap. Call a suzuki dealer, ask for service and as what the gap should be. Your problem is more than likely not having set the gap. Before you change that gap, if you can, measure what is now vs/what it should be. You will need a feeler gauge. Grainger sells the, so des NAPA.
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