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Old March 15th, 2015, 11:19 AM   #1
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No more denso TT platinum sparks for me

Ever since I installed denso TT platinum on my car it was never really the same. I would have random idle drop to the point the car would almost stall out. Spakra have around 15k on them. Was swap during my head swap last summer. The gap changed from what they original were.

So today I decided to go back to iridium, and it was a big different. AFR were on spot now during part throttle and WOT. Hopefully I would see a gain in MPG again since my city drive have been around 17-18mpg (extremely short trips)

Here are pix of my sparks.

cylinder 1
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cylinder 2
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cylinder 3
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cylinder 4
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cylinder 5
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cylinder 6

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Last edited by thisaznboi88; March 15th, 2015 at 11:30 AM..
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Old March 15th, 2015, 12:11 PM   #2
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Glad you finally figured that out, LOL.
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Old March 15th, 2015, 12:20 PM   #3
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yeah I was being cheap. In my mind I was think that I am just going to change them often. Well they only last 15-20k. Might as well pay double and get iridium that last up to 100k. I got my denso iridium for 5 bucks each after discount from advance auto parts. NGK were like 10 bucks each.
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Old March 15th, 2015, 12:55 PM   #4
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Well now you know Ken lol. I went through that back before i started modding. I tried octane boost, injector cleaner and a bunch of other stuff thinking it was bad gas. Turns out the former owner of my car used platinum plugs. In the end i spent close to $100 chasing things instead of $60 for new plugs.
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Old March 15th, 2015, 02:39 PM   #5
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haha my car came with them too, I would have random CEL under WOT and sometimes a slight misfire. didnt know it was from the plugs being cheap n bad
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Old March 17th, 2015, 09:39 AM   #6
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I got 6 Iridium Power IK20 for under $40 on Amazon. Being cheap?? I swapped to Iridium IK16 way back in my 98 Accord V6, it already made a world of difference. No platinums... they are crap.
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Old March 17th, 2015, 10:15 AM   #7
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my logic was if I go platinum I could swap them often and check on the spark plugs to make sure they don't back out. Some people been having issue with the spark plugs blowing out of cylinder 5 and 6. Never expected them to die in 15k or less. That copper plug status
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Old March 17th, 2015, 02:18 PM   #8
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Are you thinking that the Iridium plugs are getting hotter than copper or platinum plugs, that's why #5 is backing out? #5 has been backing out on several heads, including TL and CL, I've spoken to an Acura tech about this. If plug type is the problem, then all of them would back out wouldn't they? But only #5 does. I used Iridium IK16 on my old 98 V6 Accord, 5 sets in 150000 miles and none of them ever backed out.
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Old March 17th, 2015, 02:21 PM   #9
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No i am thinking that they just get loosen over time even when they are torque correctly.

When I took out my plugs my front were extremely tight and the rear were looser. I know that they were all tq to spec on a cold motor before hand when the built cylinder heads were dropped in.

Just trying to avoid the car nuking a 1000 head.
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Old June 23rd, 2015, 11:43 AM   #10
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Question about my plugs. My '05 is at 95k miles now and I'm getting ready to replace the water pump, belts, etc.. I will be replacing the plugs also but I wanted to know if I should also look into replacing the coils as well. Would that be a good practice at 100k maintenance? Thanks for your input.
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Old June 23rd, 2015, 11:46 AM   #11
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if the car is not misfiring i wouldn't replace them
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Old June 23rd, 2015, 02:51 PM   #12
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I prefer NGK over Denso
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Old June 23rd, 2015, 04:27 PM   #13
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meh all made in japan. doesn't really matter
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Old June 23rd, 2015, 05:18 PM   #14
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The rear bank sparks totally get loose, #5 always being the loosest. Heat from the rear bank precat is most likely the issue.
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Old June 23rd, 2015, 06:08 PM   #15
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The rear bank sparks totally get loose, #5 always being the loosest. Heat from the rear bank precat is most likely the issue.
I thought the issues were all with the front middle one that gets loose
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Old June 23rd, 2015, 06:40 PM   #16
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rear is the one closest to the radiator. 5 and 6 have issues.

here how the cylinder are number

Fire wall (front)

1 2 3

4 5 6

radiator (rear)
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Old June 24th, 2015, 03:03 PM   #17
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rear is the one closest to the radiator. 5 and 6 have issues.

here how the cylinder are number

Fire wall (front)

1 2 3

4 5 6

radiator (rear)
Ah, gotcha. I check 5 every oil change.

No idea if it's due to precats, I'm running PCDs
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Old June 24th, 2015, 04:53 PM   #18
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meh all made in japan. doesn't really matter
IIRC it says "made in japan" but really isn't anymore actually. Denso is still actually from japan. And plus the OEM spark plug is denso not NGK. if the 2 dollar difference (ea.)is the reason you dont get it then i would wait until advance has there 50 dollars off 100 coupon which pops up every now and then.
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Old June 25th, 2015, 05:55 AM   #19
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And plus the OEM spark plug is denso not NGK.
Both are OEM. My Accord came from the factory with NGK plugs.
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Old June 25th, 2015, 01:29 PM   #20
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they only go loose if they are improperly installed, or removed and reinstalled. There's a washer on their that crushes and creates a pretty damn good seal for a reason. but if you back it out and retighten it, it will never be the same.
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Old June 25th, 2015, 03:14 PM   #21
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Also don't put anything on them. They are zinc coated to prevent seiging in the hole
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Old June 25th, 2015, 05:17 PM   #22
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Also don't put anything on them. They are zinc coated to prevent seiging in the hole
Wth is seiging?
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Old June 25th, 2015, 06:14 PM   #23
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sieging as in stuck to the head
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Old June 25th, 2015, 07:49 PM   #24
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You mean seizing?
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