ngk or autolite platinum series
ACDelco R45S conventional spark plugs for an original ignition system.
Mallory ignition or MSD ignition are the best bang for your buck. Personally i have used mallory unilite and have excellent results.
You have to use platinum-tipped spark plugs ONLY.
NGK laser iridium spark plugs.
the best spark plugs for all ford vehicles are the motorcraft type, which they come from ford.
The best spark plugs are the original equipment plugs that were installed by the manufacturer at the factory. Sometimes you may need to go to a dealer to get the exact plugs.
1) Disconnect the wire harness from the ignition coils2) use a 10mm socket to take off the bolts on the ignition coils3) pull the plug boots out in pairs ( so you don't have to disconnect the wires)4) remove spark plugs with standard spark plug tool(comes with most socket-sets)5) gap new plugs to .04 with spark plug gapper6) install new spark plugs (make sure they're tight, but you don't need to kill it)7) put the plugs boots back (the wires 'click' on the plug, the coil boots don't 'click')8) put the ignition coil bolts back in9) reconnect the wire harnesses to the ignition coils10) enjoy your sweet car!!**NGK plugs are your best bet**if you have any check engine lights, disconnect the battery for 5 minutes to reset the codes
Most likely because its spark plugs are shut. Second best, ignition wires need to be replaced. Third best, injectors are full of carbon.
AC plugs
To change the spark plugs on a Vauxhall Zafira open the hood of the vehicle. The spark plugs will be located on the engine. It is best to used a spark plug removed to unscrew the plugs. They will be connected to a cable. Remove the cable. Replace the plugs with new ones and reattach the cable.
It is best to go with the factory used spark plugs. The factory uses champions.
As for NGK or Denso OEM spark plugs.