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The gap needs to be checked before instillation.
They do not need to be calibrated but may need to be gapped. The gap setting is .060 thousandths of an inch. Some plugs come pre gapped and some are not adjustable on certain plug brands
For the XP iridiums. Its .50 to .51
the proper plugs come pre-gapped. you do not need to adjust them.
yes take it to auto zone to get the gap peice and specs
The spark plug gap for a 2004 Chevrolet Suburban should be set at .040 inches. The new spark plugs are pre-gapped and do not need adjusting.
Yes , should be checked Yes sometimes in shipment they get knocked out of seting
Any platinum plug. You will need to gap them properly, or buy plugs specifically gapped for the particular engine. You auto parts store can help.
Yes, all spark plugs need to be gapped... but make sure you keep in mind that if the gap is not correct - if there is not enough gap, the spark will not be big enough, and if it is too wide, then there will be too much spark. Standard seems to be .45 but I would check with a dealership near you for a size recommended by them, the underhood specifications, or the brand's specs for that application, as they vary from 44-54!
There are several different "Bosch" spark plugs that don't need to be gapped (actually gapping them will damage them) that are perfect for Ford Thunderbirds!!!
The spark plug gap, on your 1997 Nissan, is .007. Most spark plugs will come already pre-gapped and will not need any further attention.
You do not need to gap double ground spark plugs. Just put them in right out of the box, but note how they are gapped. As the plugs wear out, the gap increases, so when you notice the gap increasing, change the plugs.