SP546 HT15 Set of 8 Pcs Spark Plugs for Ford 5.4L PZH-14-F PZH14F SP507 for Mustang F150 F-250 F-350 Super Duty Mercury Navigator 04-08

4 out of 8 were misfiring straight out of the box. One at a time the others are going bad also. They came in generic white boxes. The plugs themselves looked like Motorcraft but I am definitely not happy with this purchase.

buenos

They fixed my problem with my F150-5.4L triton

DO NOT BUY! These are not OEM. They are knock offs. Only have 3000 miles on them and they are starting to drop one after another. I am noticing other buyers with similar problems also. Ran great for first few months, now im spending more time and money running codes and working on my truck. outside return date also. Buyer beware.

Absolutely junk, if you like wasting time and money buy. These are like domino's 1 fails than the next and the next. I don't enjoy changing plugs in the winter with the wind blowing up my but and freezing fingers. When I purchased it took 2 months to get and was out of window to return. Pretty sure came on a slow boat from China. DO NOT BUY!

I installed a new engine so I decided to go with OEM spark plugs so I purchased these 300 miles into the truck it started running really bad and after putting all kinds of money into the engine thinking it was something else that I didn't already replace turns out the spark plugs were defective save yourself the money do not buy!!!

Had an engine code missing on cyl #2. Put the new plugs in and got 13 new codes missing on several cylinders and all 8 coils bad :( only drove it about 5 miles. So I pulled in the auto parts store and bought another set. Changed them and now all is good :)

Had an engine code missing on cyl #3 & 5. Put the new plugs in and got more misfire codes 1,3,6,8 missing on several cylinders only drove it about 100 miles. So I pulled in the auto parts store and bought another set. Changed them and now all is great