Side by Side Comparison of: Motorcraft vs ACDelco

Great Price! Read up on how to remove the old one's before you tackle this job! You tube has some good advice. Start by running a couple bottles of Seafoam through half a tank of gas first to loosen the carbon build-up around the electrode extension of this long plug - or they may break off upon removal, compounding your cost and frustration with this project. My dealer and local mechanic wanted $550 to replace the plugs, including the plugs. Saved myself $460. The $550 must include some buffer for breakage removal because they are known to break upon removal if precautions and patience are not taken.

Truck is running strong again! These plugs are the updated ones from motorcraft. My truck had a slight miss when in low rpm in fourth gear. I pulled the plugs and there was nothing left of the center electrod lol. Amazing my truck was still running lol. By the,PB blaster saved the day when changing these bad boys. A master tech at Ford told me to soak old plugs with PB blaster for 24 hrs before you try and remove them. If you don't,you might break a plug in the cylinder head. And that is no good.#pbblaster#9/16sparkplugsocket#wadbleextensions#24hours#patience#5.4Lrunningstrong.

What I didn't like was changing my spark plugs in the first place, but these were a great OEM fit for my 2006 Ford F-150 5.4L V8 Triton. I did not have to gap these plugs (they are pre-gapped). I used anti-seize on the threads so I don't repeat the pain of replacing these (see photo) . I ordered 8 spark plugs and they sent me two boxes which included 4 individually boxed plugs each. They were also far cheaper on amazon (by about 50%) than my local chain auto parts stores. I trust the Motorcraft name and these did not disappoint.

Good plugs so far. Ordered 16 as I have two Ford vehicles that needed plugs. Changed the set on first vehicle and I had one cylinder that kept throwing code so I changed coils as well and it was still throwing code so I changed the plug again with one of the remaining 8 and problem cleared. I changed plugs in my second vehicle and again the same plug kept throwing code on that cylinder. Not sure what was wrong with it, it looked fine from outside, maybe it had a broken center conductor? Regardless, I requested a new one from Amazon and it was delivered quickly and worked great. Only time will truly prove how good plugs are. Both my vehicles already had over 100k on orignal plugs before starting to have issue. Just hope these are close to that good

These plugs installed just fine and none of them arrived broken. Remember to put nickel anti-seize on the shield before installion. I would also recommend the lisle broken plug remover because they will break during reomoval. I broke 5 out 8.

OEM replacement. My 454 runs like a top. (It still drinks gas like a sailor on shore leave though)

good plugs cheaper than local

Good performance.

best deal i could find on the plugs i bought

Arrived on time and work great! Less expensive and more convenient to aquire.

Perfect replacement for my 41-921 plugs on my 2000 Impala. If I had known the OEM plugs were Iridium I would have gone with those but these platinum plugs should last as long as I own the vehicle. I have had a set of ACDelco Platinums in my 1998 GMC 1500 5.7L for 20K now and it still runs perfect

just pulled 8 out without breaking them and they had about 67k on them; didn't look like the last tech had even put any anti-seize on them either. Hopefully they'll come out just as uneventful next time.

So far these plugs are doing quite well. My misfire is fixed and my truck runs very well other issues aside (I've got a few problems left to fix. 100k maintenance check was missed) the plugs themselves work great and were very easy to install. However the stock plugs for the 04 to 2010 (pretty sure that's the year range) will be extremely difficult to remove because they were poorly designed. You will be almost guaranteed to need a plug extractor because the bottom of the plugs will get stuck. That said you'll be saving a ton of money because mechanics will charge a significant fee for the job.

Made a huge difference in my Triton 5.4 3V motor. The engine was running rough and there was lot's of misfiring going on. I had been putting off changing the plugs as I knew there are issues getting the old ones out without breaking due to the original plug design so last time (first time I had the plugs changed) I paid the dealer to do it. I didn't expect the $450 price tag to change them. This time I bought the "CTA Tools 2385 9/16-Inch Ford Triton Spark Plug Socket" which worked out really well and the "Lisle (LIS65600) Broken Spark Plug Remover for Ford Triton 3 Valve Engines" tool just in case. Since the dealer thankfully had replaced the original plugs with this newer design, I did not have to use the broken tool remover, but it was good to know I had it just in case and I didn't know the dealer had used these newer plugs. Removal and installation was relatively easy except the are a few tight places to get into. There are some You Tube videos on what to remove in order to get access to all plugs that helped. After install my engine runs great and I'm happy. No gap to worry about as these are pre-gapped and cannot be changed. I wish I would have done this six months ago.

Bought the 2 piece motor craft plugs for my 06 f150 truck has a little over 112 k on the motor. Dreading the change out set aside five days for removal here's my 2 cents, first I soaked them in carb cleaner for 2 days blew out cleaner with air hose followed up with a kroil soaking for 1 day (filled each home till product covered plug hex) fourth day got impatient took my 9/16 socket/ratchet and tried to take #1 out. A lot of force was required till I heard a POP plug came out didn't break. Did this when engine was cold replaced plug hooked everything up and started vehicle up ran for 25 min till operating temp was reached I have a makita 18 v compact impact driver and took the remainder 7 plugs out with no incident I believe the heat and the blows of the impact drill made it possible to extract them no problem DONT CHANGE THEM OUT COLD!! pcm and intake housing was removed didn't buy extractor tool

For what type of plug it is, it is what i expected. Just wish motocraft would have made a one piece; would have solved everything. Better buy nickel anti sieze like the tsb states.

Good product. In retrospect, if you have a 3.5 GM engine mounted sideways, where you need to pull the engine forward to access the 3 rear plugs, invest in the double platinum plugs because they last longer, and you can delay the install process for quite a while...but these work great, and I'm happy.

Must gap them, but so far, so good.

ran them on my truck and no check engine light so, all good..

it runs gud thanks

These are the wrong plugs

They Fit and worked OK

Same as original plugs that came out in 2 pieces after 50,000 miles, two-piece assembly, expect these to be similar when they get changed. Recommend others search for the more expensive but less troublesome one piece alternative and save a lot of time.

Nothing special. OEM, it works. This was a replacement for the same kind. I got about 12k miles out of this one then the pin broke and it needed replaced.

Bought a used 05 F150 and did the dreaded spark plug change. Luckily, they were all autolites and no plugs broke. The engine actually idles slightly rougher after installing these, so I can't give them a great review. In hindsight, I should have gone with the autolites.

Bought 8 plugs, but had one of the eight turn out to be faulty. Ended up buying a new one from an auto parts store locally and fixed the problem. This created major headaches since I had replaced both the plugs and the coils at the same time. This lead to a trial and error method until the culprit was found.

I recently installed these on my 2004 F150 FX4 and I must say that in conjunction with the Accel Coil Packs I can tell a big difference in performance over the stock packs with autolite plugs I was running. The reason I only gave 3 stars is because after going through the painstaking process replacing these plugs is (thanks Ford), one of the plugs I had received was a dud. This caused an obvious miss and took a few more hours to track down exactly what was wrong. Were it not for that I would have rated higher but after that many hours of work I wonder if the Champions would have been a better choice.

2005 Ford F150 5.4L: I bought a set of 8 Motorcraft SP-515s, and after a painful old broken plug extraction x3 with the Lisle tool, I installed all 8 of them and encountered a misfire. I then swapped out all the boots with new ones to make sure, still misfiring. So the I go to HF and get an OBDII/CAN diagnostic tool: cylinder 2 misfire. I swapped coils with cylinder 1, and the problem stayed with cylinder 2. I pulled the new Motorcraft plug out, went to the local auto parts store, and all they had were Autolite HT15s. So I buy one, pop it in to cylinder 2, and guess what, no more misfires. They guy at the store tells me that Autolite makes the exact same plug for Motorcraft. Ford Motorcraft just re-labels them as their own. Visually, they are exactly identical except for the branding marks. These are Chinese junk plugs either way, but you are stuck with them (see what I did there). They are really the only ones that will work right with these finicky Ford engines. Stick with the Autolites and pay less for the same crapola, and consider yourself very lucky if you don't get a dud in the bunch. Use lots of anti-seize on the plugs, dielectric grease on the boots, and put this nightmare behind you for another 100k miles.

I ordered these plugs for a 2007 Ford F150 with a 5.4 Liter engine and 70,000 miles. The good news is I got all of them out without breaking any of them. If you have a Ford with the poor plug design I recommend changing them early. I only gave these plugs 2 stars for two reasons. First they came in 4 separate deliveries one delivery had 5 plugs and 3 delivery envelopes had 1 plug each. OK, this shouldn’t matter, but one of the envelopes was smashed and the plug was pushed out of its box. I was concerned about this plug so I installed it in an accessible cylinder, just in case. So like I said, I changed out my plugs without breaking one, yeah me! I took the truck for a test drive and was pleased. Later that weekend I drove it again and felt a miss. OK some carbon maybe? I then drove it to work on Monday and the miss got worse. I thought to myself how in the heck am I going to track down this intermittent miss. This could take days. Driving home it got worse and the engine light came on. I was never so happy to see an engine light. I pulled into my driveway rushed in the garage, grabbed my OBD-II and discovered there was a miss in cylinder #3. OK , not the one I was concerned with and luckily not the worst cylinder to get access. If it was #4 I would be winning like a baby. So I took my son’s car to the parts store and bought a plug. I put it in and the truck idled purrrfectly. I studied the plug and it had a micro-fracture. I believe the micro-fracture expanded the more I used the plug. It is clearly in a location where it wasn’t damaged in shipping and had to be a manufacturing defect. So what does this mean to any future buyer? Well, these plugs will cost you 30% to 40% more at your local parts store. And the problem with the plug isn’t because I bought it at Amazon although the shipping was sloppy. There are very few alternative manufactures and there are concerns with all the alternatives. So I guess it doesn’t help you decide much. But, hey it is my near nightmare and I wanted to share it.

Ordered 8 for a tune up on my F150. When I opened the package 2 fell out of the box like the package was opened. Installed the 2 in the front because they had an oil coating on them and looked suspect. Sure enough had a bad miss and had 2 pay 40 buck for diagnosis and those 2 in the front had to be replaced.

Not a happy customer - Don't even try to remove these plugs without Lisle Remover. Had to replace these plugs in stages. The first five took 6-7 hours to replace. Every one broke off. Two more took five hours to replace. These were the two plugs under the firewall on driver's side. Both of these broke off, but the one all the way in the back, didn't break off the terminal and electrode wire that runs down through the porcelain . Thus I had this extremely hard wire to try and break off with every tool I could think of. Very hard to get down in the hole and get something on it to wiggle and break off. Waited another week and took the back plug out on passenger side. This went very well, came out with a little muscle. And just screwed new plug in. However, I had a bad miss on the two plugs that I put in the week before. I pulled the coil off on both of these plugs a couple of time and cleaned. Nothing helped. I new it had to be on of these two plugs as I didn't have the miss before replacing these two. Finally ended up pulling the back plug out, of the two. This brand new plug had the one piece ground electrode burnt completely through and the positive electrode broke off. I have no explanation how this could happen. Wish somebody would let me know. Very poor plug setup. Guess I need to blame this setup on Ford. By the way, I put carburetor injection cleaner in a week before the first five plugs I pulled. Another bottle in before the second two. And another bottle in before taking out the final plug. The last plug screwed out and was really clean. The other plugs that broke off were very black. I use 20-25 gallons per week of gas. It appears the carb cleaner worked. I would suggest running cleaner though the engine 800-1000 miles before attempting to replace the plugs. I can't scientifically assert that it works, but that plug came out like it should, after the cleaner. I had 88,000 miles on the plugs.

Update - I believe Champion has a one piece replacement plug that does not break off. Check that out before you buy these.

The only reason I gave a two star rating is one of the 8 plugs I ordered was broken out of the box. The electrode was loose and pulled out of the ceramic. I will say surprisingly Amazon didn't do a great job packaging so that could be why. The eight plugs were put in an approximately 8x6x4 box with some air packaging along with a special removal tool. By the time the plugs arrived a few were out of the boxes they are individually placed in from the factory. The few plugs that were out were likely banging against each other and the box as the package was being delivered. If they would have taped,wrapped, or put the 8 plugs together in a zip-lock or something it's likely the one plug wouldn't have been broke. I ended up having to purchase a plug from the local Ford dealer for around 14 dollars with tax so I didn't end up saving any money ordering this item from Amazon. Overall the plug is the recommended replacement plug by Ford and that's the reason I purchased and installed them and would do so again. The one broken plug may have also been a defective plug from Motorcraft. On a side note I only broke two plugs on my 2004 F-150 5.4 with 106,000 miles. The next time I change plugs will probably be around the 60,000 to 80,000 mile mark just to make sure there are no problems. Also so far I haven't contacted Amazon to ask for a refund for the one broken. That will be my next step.

to save my college student a little money, my husband ordered these and installed them. Her truck began to run worse. We couldn't figure it out. Took it to the mechanic who we had to pay to check it, ignored the spark plugs because we told him we had just replaced them. Couldn't figure out why truck was running so bad. Daughter went back to school with poorly running truck. Took it to another mechanic (again, had to pay them). Found out that 3 of the BRAND NEW spark plugs were BAD! So now we are out original cost, time and 2 mechanic fees as well as cost for 3 more plugs! Really thought Motorcraft product would be better. Got the final bill! All in $310 for something that should have cost $40.

Two of the five plugs were non-functional. Ford dealer say this isn't unusual for SP-515 plugs. UGH!!!!!!

I have a 2006 F150 Lariat with 120K on it and knew it was way past time to install new plugs, although the truck runs perfectly. I bought the Lisle kit, the OTC 6918 (which I highly recommend, removed all 8 without breakage), these plugs and the Accel supercoil set for a standard tuneup. Using the OTC I was able remove all 8 successfully, super helpful tool.

I was thrilled all came out and new ones went back in just as easy. Plugged in coils, double checked everything and started it up. It was barely running and missing like crazy! Turned it off triple and quadruple checked everything. No change, barely ran. Super frustrated and went online to see what the heck I was missing.

First thought was that the coils were bad. I removed all the new ones and put the old ones on which I knew worked. No change. I read online about carbon build up inside the plug hole and tried cleaning that up. Meanwhile I kept getting codes on random misfire and sometime specific cylinders. It took me a while to figure out.

Finally decided to remove the new plugs and put the old ones back in. I started with the cylinders that came up as misfiring. Cleared the codes and repeated. Turned out that 5 of the 8 plugs I received were bad. I have no idea why. Some did show up out of the box and just loose when I received my package, maybe that had something to do with it. Anyways off to the local store to pick up a new set.

I do not recommend these plugs, maybe it was just the shipping, but 5 out of 8 is not very good.

*UPDATE*

Bought 8 new Rotorcraft SP-515 plugs, installed them and all work and the truck runs even better than before. Bummer that so many came from amazon bad. Maybe it was just the shipping.

Low quality. One out of eight was defective and failed after 10 days in service. Expensive proposition for dealer to diagnose and repair ($350). Avoid this product. It is manufactured in Mexico. Amazon refused return to add insult to injury.
UPDATE: 21 months later another 5 of the original 8 failed w/ high resistance. Made in China? Made in Mexico? Who knows but I only buy from local auto parts stores now to avoid counterfeit goods...

Two out of i eight plugs are defective had to take my truck back to the mechanic and pay more money I have is deffective plugs taken out and buy new ones

If you have a late 90's to early 2000's 5.7 vortec, use the iridium plugs. These 41-902's are very disappointing! 2 plugs lost "platinum" pads, plus 1 plug developed cracks in insulator that caused a hesitation/stumble @ 1500 to 2000 rpm under light throttle.