NGK Iridium spark plugs - Mustang Evolution

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Old 01-08-2015, 08:09 PM   #1
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NGK Iridium spark plugs

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ID:	173148 I was going to replace my spark plugs and put these in. Any better recommendations?
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Old 01-08-2015, 08:13 PM   #2
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Attachment 173148 I was going to replace my spark plugs and put these in. Any better recommendations?

Those are pretty damn amazing.


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Old 01-08-2015, 10:11 PM   #3
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Autolite 103 at auto zone.

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Old 01-08-2015, 10:33 PM   #4
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I put some factory Motorcraft spark plugs in my car to replace the original plugs and I noticed an immediate improvement in smoothness, power and economy. It was incredible!

This was probably due to them being the original spark plugs and having 130k miles on them, though.

You don't need to spend a bunch of money on fancy spark plugs for these engines. The spark plugs that they installed at the factory work excellent as would, any equivalent platinum tipped spark plug.
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Old 01-09-2015, 06:52 AM   #5
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Yea, everything ive heard, is that this engine was designed around regular motorcraft platinum plugs, and that iridiums wont make a difference in these cars. I havent tried the iridiums myself but have been tempted. maybe the newer models, like Laquisha would benefit, but ours were designed in 92, and moderately changed in like 99.

and yea, to tell the difference, you gotta put in new motorcrafts, test, then swap for iridiums, and test again, to get an idea if it makes a difference. otherwise, anyone who switches old platinums will have a huge improvement whof money on fancy spark plugs for these engines. The spark plugs that they installed at when they throw in iridium plugs.
i have ngk V power plugs now, and they work great.
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Old 01-27-2015, 12:56 PM   #6
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Hi I just bought a 99 mustang from my younger brother but from what I've been told from my older brother is that it's a custom mustang cause it has Cobra parts installed as well upgraded engine internals and externals. It has an SVT front end end though this mustang is weird but awesome looking so I would like to keep it well maintenanced, Could anyone please help me maintain my car please? It has over 200K miles.
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Old 01-27-2015, 01:21 PM   #7
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Hi I just bought a 99 mustang from my younger brother but from what I've been told from my older brother is that it's a custom mustang cause it has Cobra parts installed as well upgraded engine internals and externals. It has an SVT front end end though this mustang is weird but awesome looking so I would like to keep it well maintenanced, Could anyone please help me maintain my car please? It has over 200K miles.
Of course we can!
Do you know any of the car's maintenance history?
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Old 01-28-2015, 12:29 AM   #8
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To be honest no cause the original owner is no where to be found anymore.

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Old 01-28-2015, 12:32 AM   #9
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This is what I'm working with, I don't know if its a gt or what cause it says powered by cobra gt how do I go about figuring all this out? BTW thanks for your reply really appreciate it

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Old 01-28-2015, 12:35 AM   #10
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Probably an upbadged six engine pics?

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Old 01-28-2015, 12:42 AM   #11
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It's nice. Knowing how the engine looks will prove if it's a v6 or v8
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Old 01-28-2015, 01:21 AM   #12
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Yes. Post a picture of the engine and we can tell you which model that it is.

If you dont know the maintenance history, then you will have to check everything. Id start with an oil change, replace the fuel filter, inspect the air cleaner and clean the Mass Air Flow sensor. Also, remove the throttle body and give it a thorough cleaning. And clean or replace the Positive Crankcase Ventilation valve. Give the car a good overall inspection and see if you can spot any worn items such as belts, hoses, vacuum lines, brakes, etc.
Next, change the transmission fluid and rear end gear oil.

After you are done with that, then you can start with the fun stuff!
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Old 01-28-2015, 10:10 AM   #13
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$70 for spark plugs? Do they include a complimentary bottle of Astroglide with that?


Autolite 103s or 104s (103s are a range cooler than stock which is 104 but the modulars seem to like that).


Copper, $1 each on Rockauto plus shipping should equal out to about $15 give or take... Or get them from Autzone for $1.99 each.


Iridium/Platinum etc... is there for longevity reasons, not performance. Copper is actually going to burn the hottest and give you the best performance. It will also require you do the plugs more often which is fine on a Mustang 2V since doing plugs takes all of 45 minutes at most. Its stupid easy.
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Old 01-28-2015, 10:26 AM   #14
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This is what I have guys please help if possible thanks. Should I even have that much space in here??

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Old 01-28-2015, 10:42 AM   #15
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You got a v6 there, you said it is a 99 so it should be a 3.8l

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Old 01-28-2015, 10:57 AM   #16
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Yes. A V6.
That isn't the stock intake. I'm no expert on the V6 but I suspect that is a Windstar intake manifold.
Probably a nice little engine!


All of the maintenance advice is the same regardless.
If you post a thread in the pre 2005 V6 forum, there are guys in there who will be able to help answer some of the questions that you have about your car.
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Old 01-28-2015, 11:06 AM   #17
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Thanks very much appreciate it

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Old 01-28-2015, 11:29 AM   #18
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That is the stock intake manifold with a cai.

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Old 01-28-2015, 11:59 AM   #19
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That is the stock intake manifold with a cai.

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That's correct!
They changed them in or around 97? when they got a bump in horsepower didn't they?

Again, I'm no expert...
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Old 01-28-2015, 12:11 PM   #20
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Thanks for all the info guys it means a lot to know all of this..

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Old 01-28-2015, 01:16 PM   #21
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Little V6
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Old 01-28-2015, 06:53 PM   #22
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They changed it in 99 I believe to the split port manifold and heads

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Old 01-29-2015, 04:57 AM   #23
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I'm running those plugs and felt car ran a little smoother. But I also did coil packs (msd)and oil change at the same time.
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