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Old 04-16-2011, 09:09 PM   #1
auxmike
 
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Changed my plugs after 38k (PICS)

Car left the factory with NGK, Toyota dealers sell DENSO replacements. Car seems to run a LOT better now. I don't care what they claim, I ain't leaving my plugs in for 100K.
NOTES:
1)The factory plugs I removed are covered with what appears to be sticky cosmoline on the threads, like the stuff they rub down old military rifles with! That's what it smells and looks like.... It's NOT motor oil.
2)There appears to be a "pad" attached to the inside of the hook part of the plug across from the iridium center electrode. Never seen that on any other plug before.
3)The iridium is like a pin tip, hard,brittle and delicate.
$38 shipped Priority mail from Covina Toyota in Cali via Ebay....
The pics are from a Blackberry, so please excuse the quality.
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Old 04-16-2011, 09:14 PM   #2
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Were they easy to change?
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Old 04-16-2011, 09:51 PM   #3
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You need a 10mm socket to remove the engine cover bolts (4) first.
Under there you will see the four coil packs that are held down by another four 10mm bolts. You would need to unplug the connectors first. After that the coil pack pulls out and the hole in the valve cover is exposed, that's where the plug is. A 5/8 spark plug deep socket is needed to get the plug out.
After installing the plugs, a torque wrench is required to properly tighten them.
To answer the question, no it's not hard to do IF you have the right tools and know how/confidence.
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Old 04-16-2011, 10:00 PM   #4
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Agree with 100,000 miles seems too much . I'll usually get the iridiums changed at 70,000 > 80,000 miles . Did so with a 2000 Corolla and the fuel economy got bumped up a bit . Think they were NGK . Let us know if you get any increase in gas mileage . Don't do plugs for aluminum blocks , the old cast iron yes . Thanks for the post .
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Old 04-16-2011, 10:20 PM   #5
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Did you ever use CHEVRON Techron or SHELL V-Power for F.I. / fuel system cleaner before the change ? How did the plug for the #1 cylinder look ? Any different than the others ? All seem to be in same condition .

Last edited by Hershey; 04-16-2011 at 10:30 PM.
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Old 04-16-2011, 10:21 PM   #6
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Did my 08 sedan (52k) two weeks ago and the plugs were identical save for the screws which only had black carbon looking build-up on the half closest to the tip.
Same result as you though- Much, much smoother ride and far better acceleration.
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Old 04-16-2011, 10:57 PM   #7
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Make sure u guys check the spark plug gap still

by the way I think denso only last 30k miles vs ngk iridium 120k miles

Last edited by marcus; 04-16-2011 at 11:29 PM.
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Old 04-17-2011, 03:29 AM   #8
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NGK sparks are way better than the Denso spark plugs, nice write up Aux, I changed mine when she had 25000, and again when she hit 50000, soon to be changed again lol
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Old 04-17-2011, 03:35 AM   #9
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What is the proper gap? I'm 95k miles on the OEM setup and need to start thinking about these things.
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Old 04-17-2011, 07:25 AM   #10
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hopefully you used some sort of anti-seize on the threads, or come next time you change them they might be "welded" to the head. The metal in the spark plugs tends to react with the aluminum in the head causing them to bond together.
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Old 04-17-2011, 08:25 AM   #11
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The stock ones I replaced at 86,000 were "welded" pretty good, and had almost rust-like bond to the cylinder head. I also achieved much better acceleration and cold start with new plugs, and it seems it bumped my MPG a little too.
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Old 04-17-2011, 10:21 AM   #12
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Quote:
Originally Posted by Astroman View Post
What is the proper gap? I'm 95k miles on the OEM setup and need to start thinking about these things.
1-1.1 mm or .039-.043 inch
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Old 04-17-2011, 10:32 AM   #13
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Years ago , would set the plugs to 0.40 for TOYOTA engines .
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Old 04-17-2011, 11:23 AM   #14
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I'm pretty sure you don't gap Iridium plugs! It will damage the electrode and pad.
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Old 04-17-2011, 12:30 PM   #15
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Quote:
Originally Posted by Hershey View Post
Did you ever use CHEVRON Techron or SHELL V-Power for F.I. / fuel system cleaner before the change ? How did the plug for the #1 cylinder look ? Any different than the others ? All seem to be in same condition .
Never used any Techron, etc. all the plugs look as pictured, the same.
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Old 04-17-2011, 12:31 PM   #16
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Quote:
Originally Posted by daddyo View Post
Did my 08 sedan (52k) two weeks ago and the plugs were identical save for the screws which only had black carbon looking build-up on the half closest to the tip.
Same result as you though- Much, much smoother ride and far better acceleration.
Yeah, it DOES really make a difference! Worth doing...
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Old 04-17-2011, 12:33 PM   #17
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Quote:
Originally Posted by Bluevitz-rs View Post
hopefully you used some sort of anti-seize on the threads, or come next time you change them they might be "welded" to the head. The metal in the spark plugs tends to react with the aluminum in the head causing them to bond together.
I put a little Mobil 1 on the threads before installing. I'm sure there's still plenty of that cosmoline stuff stuck inside the hole threads.
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Old 04-17-2011, 12:36 PM   #18
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Quote:
Originally Posted by Lil Abner View Post
I'm pretty sure you don't gap Iridium plugs! It will damage the electrode and pad.
Sparkplugs.com states .044 for most of these Yaris fitments. I did'nt have a guage that went that big, but a .040 slid through without dragging.
I too was'nt planning on gapping the pin tip like electrode!
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