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This thread is about performance and i get it.

But i dont want performance. This is my gf car. 2005 ZX5 2.3L. I just want plugs that will last. I want to do it once then not worry again for at least 2 yrs.

Plats last longer than coppers. I will try the AP103s. Any issues?

And honestly, I use NGK in my car. so i really want to use these instead.

Thanks
 

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Platinum or Iridium have the longest life when it comes to plugs. Whatever brand you prefer go with those.
 

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Yeah i know...plats are good.

But the OP was against plats. I wanted to know why... and are there any ppl on the forum who have had an issues with Autolite plats.

I would get NGK plats for her car but nobody here is endorsing them. Why not?
 

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Yeah i know...plats are good.

But the OP was against plats. I wanted to know why... and are there any ppl on the forum who have had an issues with Autolite plats.

I would get NGK plats for her car but nobody here is endorsing them. Why not?
I really like NGK. I was about to buy some for this car. I always thought Autolite was some crap store brand.
 

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This thread is about performance and i get it.

But i dont want performance. This is my gf car. 2005 ZX5 2.3L. I just want plugs that will last. I want to do it once then not worry again for at least 2 yrs.

Plats last longer than coppers. I will try the AP103s. Any issues?

And honestly, I use NGK in my car. so i really want to use these instead.

Thanks
I installed Denso iridumum's in my foci at 50,000. Beats the oem's.
 

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Yeah i know...plats are good.

But the OP was against plats. I wanted to know why... and are there any ppl on the forum who have had an issues with Autolite plats.

I would get NGK plats for her car but nobody here is endorsing them. Why not?
It all comes down to better performance and changing more often with copper plugs.

Or not quite as good performance and changing out every 50k+ miles.

This is entirely what it comes down to.... I just read through all of the pages of this thread and this is the prognosis.[wrenchin]
 

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I installed the A103's in my car today. I have 37k on my focus and my mods are in my sig. I noticed much firmer powerful shifts as well as much more pep and power on take off and throughout the rpm range....
 

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Replaced my plugs today. I stuck with the A104's. I wanted to see if there would be a difference.

Sure enough there was. Idle is a lot smoother, vibration at idle with no A/C on is almost gone.

What bothered me is that when I pulled the old plugs there was a bit of oil in the threads of each one but no where else. I then realized it is more than likely just a bit of unburnt fuel.

I checked the valley's of each spark plug, checked the valve cover gasket, not burning oil. no leaks. Just on the threads. heh.

As to HP gains, I have no idea, but the car is running smoother than it has been since the old throttle body was replaced under warranty last year. We'll see if the issue comes back any time soon. I was really surprised to find the boots completely dry of dielectric grease, but they aren't anymore.
 

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Discussion Starter #152
Hey ladies?

About to hit 30k on this set of a103s gapped at .055

Still runnin great will swap them out for a fresh set next week. Getting close to 130k on motor. Engine still runs great, but a/c compressor is on its way out and I have an awful clunk in the front end over bumps, I think it's my splash guard and broken plastic.

Still getting avg of 32mpg, but only 12 mile drives now as opposed to my old 45 miles one way to work when I'd get 38mpg.

But I don't drive my car much at all, only in the winter and rainy days as my motorcycle is my obsession now.
 

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Discussion Starter #153
Just changed out a set of 103s for another set. I probably could've got another 30k on the set that were in there. Gap only increased from .055" to .058". Set the gap at .055" again. On a plus side no oil or any of the sorts were in the spark plug guides.
 

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I had three Focus either owned or driven regularly; 02 Wag, (sold ), 00 SE, SPI; 04 ZX3, CAL 2.3 w/ 5 speed. I've probably tired every type and brand of plug over several years keeping track of fuel consumption over a 10k period.

I can confirm that copper plugs do seem to work the best; the trend towards Iridum is fine for long life, but poor for fuel economy. I've made the switch yet again to AR103, which over the last 4K or so have improved fuel economy over the 104's that were tried previously; the highway milage gain seems to be about 1 to 1.5 mpg, depending upon speed. Life of the plug seems to so far about what I expected; estimated to be about 12 to 15k based upon the last check of the gap. I remember when Bosch used to sell silver plugs and they did seem to improve milage even over copper, but haven't seem them in ages....
 

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Just put a set of 104's in a few days ago and what an improvement of the platinum a that ford calls for


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Put in the AR103's over the weekend and I have to say, it does feel a bit more peppy and my idle is much better especially with the A/C on. Before the change I installed the Massive dogbone mount and would get a rough idle but very minimal now! Very impressed. Now we'll see how the MPG does.
 

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My car is going to be hitting 36K within the next few weeks. I think I am going to be changing the plugs on it. I have never had a vehicle with 100K plugs that looked good at 40K miles.

I'm afraid to change them though as they are on an aluminum head.

How likely is it that I will strip the head. I'm planning on threading them on with a fuel line, tightening them by finger, then just doing 1/16 of a turn to snug them up.
 

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I've done mine twice now all I do is use a spark plug socket, 6" extention (only one I have) and a regular socket wrench and just run them until it tightens up and give it a tug to firm it up. Don't worry to much about stripping it unless your going to HeMan them in.
 

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I've changed spark plugs a million times on engines with cast iron heads. Just a bit worried about trying on Aluminum.

Figure if I do it while the car is still only a few years old, I will be less likely to have problems.
 

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They made a scary crunching noise when I took them out ... I thought I stripped the threads!

Wasn't that bad actually, by far the easiest spark plug change I have ever done! The car idles much smoother now and I have a lot of power back under 3500RPM. There's a hill that I used to be able to go up in 5th gear that I had to downshift the last year or so. Now it seems to have all of it's power back.

Only concerning thing was the spark plug wells for cylinders 2 and 3 were filled with oil. Blew out a puff of smoke on startup!



 
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