DIY: Change your spark plugs
05-26-2017, 10:48 AM
#78
Registered User
Anyone know that this will work as spark plug remover socket? It's 9/16 SAE.
I got my spark plug socket from a local auto store for around $4
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PandaX (05-26-2017)
05-26-2017, 11:07 AM
#79
. So 9/16 SAE is good to use? I just want make sure before I buy it, don't want to waste time to return.
05-26-2017, 11:19 AM
#80
Registered User
It's slightly bigger than 14mm but only by 1/4 of a mm. I believe other members have said they've been able to do it with with 9/16, so it should be fine just be sure not to over torque the plugs. 18lb/ft or a good 1/4th turn after it gets snug.
Also might as well take the time to clean your throttle body as you'll have to take it off, and spraying down the MAF with a MAF cleaner doesn't hurt either.
Also might as well take the time to clean your throttle body as you'll have to take it off, and spraying down the MAF with a MAF cleaner doesn't hurt either.
Last edited by wolfxrider; 05-26-2017 at 11:21 AM. Reason: Additional maintance
08-15-2017, 07:34 PM
#81
Done
I did mine today @ 127K. Glad I found this thread , I might have overlooked it even longer. I used a piece of hose. I save a lot of stuff and had one laying around that fit good and tight. That coil pak closed to the driver seat was the hardest but the whole thing was pretty much a breeze thanks to the write up and a vast tool collection passed down to me over two generations. My BUTT DYNO says this gave me back 4.17 HP. Of course I also cleaned the TB's while I was in there. 
Last edited by 04STi208G37; 08-15-2017 at 07:36 PM. Reason: spelling
02-06-2018, 11:14 AM
#83
This bad boy is pricey but worth it:
It is not only the right length, but it also has a plug retention I believe. PLUS it has a built in clutch to our exact 14lb torque setting. It's the first thing I bought for my car after buying it.
It is not only the right length, but it also has a plug retention I believe. PLUS it has a built in clutch to our exact 14lb torque setting. It's the first thing I bought for my car after buying it.
03-31-2018, 05:05 PM
#84
Did it today, was good
Today I changed the spark plugs and cleaned out the throttle bodies. It took under 2 hours to finish everything and clean up. I did not disconnect anything from the throttle bodies. I did change the throttle body gaskets.
After I finished, it was idling a little high, so I did the throttle reset procedure described in this thread and it is idling at 650 again, nice and smooth.
The procedure I had to do on my 2008 g37s was SLIGHTLY different than written earlier in this thread. Here is what I did:
Warm up car (drive around)
Turn off car, wait 10 seconds
Turn on ignition (But do not press the gas pedal when doing this), wait 3 seconds
Pump gas pedal fully 5 times (in under 5 seconds) and release
Wait 7 seconds
Fully press gas pedal to floor
After about 10 seconds the "Service Engine Soon" light will turn off, after about 5 more seconds it will start blinking, then after 5 more seconds it will stop blinking and stay on.
Start the car and see if the idle is better
It took a few tries to get the timing right, I ended up using the stopwatch on my phone.
After I finished, it was idling a little high, so I did the throttle reset procedure described in this thread and it is idling at 650 again, nice and smooth.
The procedure I had to do on my 2008 g37s was SLIGHTLY different than written earlier in this thread. Here is what I did:
Warm up car (drive around)
Turn off car, wait 10 seconds
Turn on ignition (But do not press the gas pedal when doing this), wait 3 seconds
Pump gas pedal fully 5 times (in under 5 seconds) and release
Wait 7 seconds
Fully press gas pedal to floor
After about 10 seconds the "Service Engine Soon" light will turn off, after about 5 more seconds it will start blinking, then after 5 more seconds it will stop blinking and stay on.
Start the car and see if the idle is better
It took a few tries to get the timing right, I ended up using the stopwatch on my phone.
10-09-2018, 09:22 AM
#86
Registered Member
Changed plugs at 105,000 miles and cleaned throttle bodies. Wow what a difference, smoother and more power. One note, all the plugs felt like they could snap taking them out because of the dissimilar metals, so I sprayed PB blaster and that made a difference.
08-04-2019, 01:43 PM
#87
Maybe it’s just my torque wrench but I set it to 14 ft lbs and the spark plugs were hand tight. Now when I go to torque them down it’s taking an unusual amount of turns? I was told it only take like 1/4 turn from hand tight so I stopped after about less than 1/2 a turn because it didn’t click. I know there’s a metal crush washer that gets compressed, am I doing something wrong?
