The gap needs to be checked before instillation.
Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.
Yes , should be checked Yes sometimes in shipment they get knocked out of seting
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.
New spark plugs do not necessarily come already pre-gapped for the application. Remove the spark plugs and gap per specifications. If you are not sure what the gap should be, call the auto parts store where you bought the plugs and ask them.
The spark plug gap for a 2000 GMC c3500 with a 7.4 liter engine should be set at .045 inches. New spark plugs should not need to be gapped as they come preset from the factory.
I'd suggest pulling the new plugs and checking the gapping. Replacing properly gapped plugs with improperly gapped ones can cause a loss of power. And if you replaced them yourself with "pre-gapped" plugs, check them anyway. A lot of the "pre-gapped" ones are incorrect. If you are a do-it-yourselfer just pop a few out and check the gapping. If not, take it back to the garage that did the work and tell them of the problem and ask them to check.
To change the spark plugs on a Chevy Metro LSI, first, ensure the engine is cool and disconnect the battery. Remove the ignition coils or spark plug wires, then use a spark plug socket to carefully unscrew the old spark plugs. Before installing new plugs, check the gap and ensure they are properly gapped according to specifications. Finally, install the new plugs, reconnect the ignition components, and reconnect the battery.
The proper spark plug gap for a 2002 Yamaha YZ250 is .024 inches. New spark plugs usually come pre-gapped, however.
To change the spark plugs on a 1996 Oldsmobile Aurora, first, disconnect the battery to ensure safety. Remove the engine cover if necessary, then locate the spark plugs, which are typically beneath the ignition coils. Unscrew the ignition coils, carefully pull them out, and then use a spark plug socket to remove the old spark plugs. Install the new spark plugs, ensuring they are properly gapped, reattach the ignition coils, and reconnect the battery.
To change the spark plugs on a 1997 Oldsmobile Achieva, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil or spark plug wires from the spark plugs, being careful not to damage them. Use a spark plug socket and ratchet to unscrew the old plugs, then install the new plugs, ensuring they are gapped correctly. Finally, reconnect the ignition components and the battery terminal.
"Spark plugs are typically designed to have a spark gap which can be adjusted by the technician installing the spark plug, by the simple mechanism of bending the ground electrode slightly to bring it closer to or further from the center electrode. The belief that plugs are properly gapped as delivered in their box from the factory is only partially true, as proved by the fact that the same plug may be specified for several different engines, requiring a different gap for each. It can depend on the engine: new spark plugs might be pre-gapped for a V-8 engine, installing all 8 plugs unchanged; however, for a 6-cylinder engine, all (6) plugs would be re-gapped." strait from wikipedia. http://en.wikipedia.org/wiki/Spark_plug
To change the spark plugs in a 1991 Nissan Stanza, first, remove the ignition wires from the spark plugs, noting their order. Use a spark plug socket to unscrew the old plugs and replace them with new ones, ensuring they are gapped correctly. For the distributor cap, locate it on the engine, then disconnect the wires and unscrew the cap. Replace it with a new cap, ensuring that the wires are reconnected in the correct order.