Spark Plus on 2008 Bullitt
6/7/13, 02:30 PM
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Spark Plus on 2008 Bullitt
Hey guys,
I'm due for a spark plug change. I've read the spark plugs snap and it seems like a hell of an ordeal to do at home. I'm trying to decide if its worth it to take the car in for the dealership to do ($360 for plugs and fuel filter) or is it something easy enough to do at home. I've never done it before, the most I've done is clean my throttle body, install cold air intake. One of the things I can't find is at what point did Ford use different spark plugs to avoid the issue.
Any help would be appreciated.
I'm due for a spark plug change. I've read the spark plugs snap and it seems like a hell of an ordeal to do at home. I'm trying to decide if its worth it to take the car in for the dealership to do ($360 for plugs and fuel filter) or is it something easy enough to do at home. I've never done it before, the most I've done is clean my throttle body, install cold air intake. One of the things I can't find is at what point did Ford use different spark plugs to avoid the issue.
Any help would be appreciated.
6/7/13, 02:36 PM
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Hey guys,
I'm due for a spark plug change. I've read the spark plugs snap and it seems like a hell of an ordeal to do at home. I'm trying to decide if its worth it to take the car in for the dealership to do ($360 for plugs and fuel filter) or is it something easy enough to do at home. I've never done it before, the most I've done is clean my throttle body, install cold air intake. One of the things I can't find is at what point did Ford use different spark plugs to avoid the issue.
Any help would be appreciated.
I'm due for a spark plug change. I've read the spark plugs snap and it seems like a hell of an ordeal to do at home. I'm trying to decide if its worth it to take the car in for the dealership to do ($360 for plugs and fuel filter) or is it something easy enough to do at home. I've never done it before, the most I've done is clean my throttle body, install cold air intake. One of the things I can't find is at what point did Ford use different spark plugs to avoid the issue.
Any help would be appreciated.
The brown boot shows you have the new design:
6/7/13, 02:39 PM
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Thanks! Any tips for a first timer? Do I need a torque wrench or anything?
6/7/13, 03:37 PM
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Blow any sediment from the plug wells before you remove them so grit doesn't fall in the combustion chamber.
Double check the gap - don't trust the gap out of the box.
The 2008 Mustang Manual says to pull with a slight twisting motion for removing the coil on plugs. Recommends a bit of 'brake caliper grease' on the inside of the coil boots before installation. Tighten coil bolts to 44 lb-in/5 Nm.
It also says for "Late build vehicles" (Brown boot) to tighten plugs to 9 lb-ft/12 Nm. Silly book doesn't give the plug gap. It does for the 4.0L6 and the 5.4L 8, but not the 4.6L8.
Last edited by cdynaco; 6/7/13 at 03:39 PM.
6/7/13, 04:13 PM
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That's good to know. Ill have to check the build date on my 08 GT/CS
6/7/13, 05:11 PM
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I'm seeing .045 gap on a number of searches (TMS & google) but haven't found anything on a Ford/Motorcraft site.
When I search part numbers (Spark Plug Motorcraft Sp-509 [new with the 12mm threads]), 2 different parts houses show the Motorcraft set to .041.
http://www.theautopartsshop.com/spark-plug/misp509.html
When I search part numbers (Spark Plug Motorcraft Sp-509 [new with the 12mm threads]), 2 different parts houses show the Motorcraft set to .041.
http://www.theautopartsshop.com/spark-plug/misp509.html
Last edited by cdynaco; 6/7/13 at 05:17 PM.
6/7/13, 09:45 PM
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A torque wrench is prob a good idea. After many years I've got the 'feel' for plugs but on aluminum heads I use a torque wrench.
Blow any sediment from the plug wells before you remove them so grit doesn't fall in the combustion chamber.
Double check the gap - don't trust the gap out of the box.
The 2008 Mustang Manual says to pull with a slight twisting motion for removing the coil on plugs. Recommends a bit of 'brake caliper grease' on the inside of the coil boots before installation. Tighten coil bolts to 44 lb-in/5 Nm.
It also says for "Late build vehicles" (Brown boot) to tighten plugs to 9 lb-ft/12 Nm. Silly book doesn't give the plug gap. It does for the 4.0L6 and the 5.4L 8, but not the 4.6L8.
To the op. Copper will give you the most power/fuel economy but, will require replacement every 15-20k. But for 2-4 dollars a plug.. who cares
6/7/13, 10:42 PM
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If your going with an iridium or platinum plug do NOT try and gap them... they are pregapped and you risk knocking off platinum or iridium with the gapper... copper plugs you definitely need to check.
To the op. Copper will give you the most power/fuel economy but, will require replacement every 15-20k. But for 2-4 dollars a plug.. who cares
6/8/13, 09:43 AM
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6/8/13, 11:01 AM
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Where do you guys get your plugs from? Autozone the plugs were about $40, AM was for $70, the dealership was $20. Do I need to change out the wires to or can those be reused?
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