Best and cheapest spark plugs? - Ford Mustang Forum
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post #1 of 12 (permalink) Old 08-01-2017 Thread Starter
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Best and cheapest spark plugs?

First time poster, long time reader. I just recently bought a 2006 Mustang GT with the 4.6 motor. Great car, love it. It has 145k miles and I'm wanting to change the spark plugs eventually. I'm well aware of the spark plugs breaking in half issue. What are best plugs to use?


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post #2 of 12 (permalink) Old 08-01-2017
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Go to autozone and ask for their motorcraft plugs for your car, mine turned out to be around 54 for all 8, I believe they're also one piece plugs at autozone, good luck!

They'll prob look like this when they come out lol Changed my plugs out of my 09 GT and worth it, i lubed em up a little bit and set a torqur wrench yo 30 ft lbs and slowly put pressure into the turn until either yhe wrench clicked or the plug came loose and then let it sit for a while while I did the other 7.


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post #3 of 12 (permalink) Old 08-01-2017
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I've used the Autolite HTO and HT1 plugs with success.

2005 Mustang GT Brenspeed 530 hp Saleen Supercharger
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post #4 of 12 (permalink) Old 08-01-2017 Thread Starter
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I've used the Autolite HTO and HT1 plugs with success.


How much were they for the whole set?


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post #5 of 12 (permalink) Old 08-01-2017
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Quote:
Originally Posted by Sterrio View Post
First time poster, long time reader. I just recently bought a 2006 Mustang GT with the 4.6 motor. Great car, love it. It has 145k miles and I'm wanting to change the spark plugs eventually. I'm well aware of the spark plugs breaking in half issue. What are best plugs to use?


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The 2006 3v uses a different plug than the 2008.5+ 3v ...

I think most use the AUTOLITE HT1 Platinum ... RockAuto.com has the best price on plugs that I've found. Price listed on them is 6.44 ea, plus 7or 8shipping ..

.

2010 Grabber Blue Mustang GT, Forged 4.6L Roush TVS and other stuff ... The modding shall never end ...

Wife's car ... 2014 Sterling Gray Premium GT 401A, stock for now ..
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post #6 of 12 (permalink) Old 08-01-2017 Thread Starter
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Best and cheapest spark plugs?

Quote:
Originally Posted by drive_55_not View Post
The 2006 3v uses a different plug than the 2008.5+ 3v ...

I think most use the AUTOLITE HT1 Platinum ... RockAuto.com has the best price on plugs that I've found. Price listed on them is 6.44 ea, plus 7or 8shipping ..

.


Thanks a bunch! Do I need a "spark plug gapper"?


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post #7 of 12 (permalink) Old 08-01-2017
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yes, you will need to gap the plugs alltho the stock gap for the SP-514 plugs is .054. the HT1 and Champions are .044 and .045. may get misfire codes. most don't get them, I did. mine is an early build (11-04') 2005 GT. good luck
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post #8 of 12 (permalink) Old 08-01-2017 Thread Starter
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yes, you will need to gap the plugs alltho the stock gap for the SP-514 plugs is .054. the HT1 and Champions are .044 and .045. may get misfire codes. most don't get them, I did. mine is an early build (11-04') 2005 GT. good luck


What do they need to be gapped to?


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post #9 of 12 (permalink) Old 08-02-2017
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My last 2 sets of plugs I've used E3's. First set I put almost right at 100k/5yrs use on them and I've already put almost 30k on the second set. No gapping required. I got mine from Pep Boys eBay store for a really good price/plug. E3 Premium Automotive Spark Plug E3.70
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i tried the E3 cuz they were super cheap at the pepboys like Jeremy said. my car didn't like them and threw multiple misfire codes and went to limp mode. I took them back and got the HT1 plugs, car didn't like them either, multiple misfire codes and limp mode. took those back and got the SP-514 plugs, put some nickel anti-seize per the TSB on the snouts. car has been running like a champ. like I said, my GT is an early build car and there was a TSB issued to address the cars that threw the multiple misfires and limp mode. I have it bookmarked somewhere. most that use the 1 piece champs or even the other plugs have good results. I however did not, just my $.02. the correct gap is .054 thou. most of these plugs use a stirrup ground strap so a special tool is needed to gap "properly". enlarging the gap is a lot tougher than shortening because of the design. just rambling now, good luck
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The gap spec in my '06 manual (pg. 230) has .040-.050.

2006 GT- Airaid Race CAI, 62mm BBK TB, SR Performance UD Pullies, FRPP Hot Rod Cams, CMDP's, Excedy Stage One Clutch and lightweight flywheel, Pacesetter Long Tube Headers with matching O/R H-Pipe & MBRP Street Axlebacks, Lito 91 Octane Tune
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I used the Champion 7989 (a one piece plug) which has no future breakage issues. I put some anti-sieze on the snorkel as per the TSB. I put them in 4 years ago and have never had a code or any issue with them. I used them out of the box - no gapping. See if Rock Auto has them. They seem to be fairly cheap source for many auto parts.
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