changing spark plugs

[toyotasupra916]

i search and found nothing. i was wondering how do u take off the throttle body part of the car to get the plugs??? and what kinds of wires are everyone using?? am bout to give it a tune up

[WhiteBlazze]

Throttle body has (2) long bolts and (2) nutts. All 12mm i believe.


Stockish wires here. Stock replacement wires are just fine.

[toyotasupra916]

so just remove those 2 bolts and i can move the throttle body??

[WhiteBlazze]

yup. you need to disconnect the vacuum lines, coolant line, and a few electrical connections.

Don't forget about un-latching the throttle cable as well.


Once you pull it straight out, just sit in ontop of the cruise control box area.


you should have enough room to pull the wires / plugs now. No need to remove the "Y" pipe or the rest of the intake.

[TSopranoIS300]

http://my.is/forums/showthread.php?t=243325&highlight=replace+spark+plugs

Difficulty: Intermediate / Mechanically inclined

Time: 2 hours (your first time around at least)...maybe less with this tutorial as a guide

Interval: About every 60,000 for NA and about every 10,000 for those with F/I is preferred.

Tools Required or used to assist:
-1/4" rachet
-1/2" rachet
-Long extension
-Short extension
-3/4" (I believe, the normal sized one, not the huge one) spark plug socket
-Needle Nose pliers
-Flat head screw driver
-Adjustable pliers
-8mm socket
-10mm socket
-12mm socket
-#5 Hex Wrench
-12mm wrench with closed end on one side
-Spark plug gapper tool with wire gap checker
-Flashlight

Suggested extra tools:
-Mechanix Gloves
-Magnetic nut retriever

Procedures for replacing spark plugs (NOT EVERYTHING DISCONNECTED/REMOVED HAS A PICTURE):

TB=THROTTLE BODY

#0: Park in an area out of the elements, open the hood and ensure you have enough light.

http://www.pbase.com/image/40251753.jpg

#1: Disconnect the negative side of the battery terminal.
#2: Disconnect at least one side of the front sway bar (if present).

http://www.pbase.com/image/40251754.jpg

#3: Disconnect and remove your upper intake piping going into your throttle body. Don’t forget to unplug the Mass Air Flow (MAF) sensor wiring harness…most importantly, do not forget to reconnect it when you’re all done!!! That was the only thing I forgot when I did this and a CEL came on during initial startup. The CEL goes off on its own when you connect the MAF harness.

http://www.pbase.com/image/40251755.jpg

#4: Disconnect the throttle cable and pull the cable out of the holding bracket completely (you do not have to undo the screw in the back like I did).

http://www.pbase.com/image/40251756.jpg

http://www.pbase.com/image/40251757.jpg

#5: Disconnect the x3 wiring harness going to your throttle body

http://www.pbase.com/image/40251758.jpg

http://www.pbase.com/image/40251759.jpg

#6: Unscrew top left bolt going into your TB ***IF*** you have a grounding kit wire going to it.

http://www.pbase.com/image/40251760.jpg

#7: Disconnect x2 coolant lines going to your TB…don’t worry only a couple drops of fluid come out. Note: Be careful not to tear any tubes. It helps to use a flat head to push the tube out by inserting the flathead in-between what the tube connects to and the top of the tube (after pulling away the hose clamp obviously)

http://www.pbase.com/image/40251761.jpg

http://www.pbase.com/image/40251762.jpg

#8: Take off TB bracket that is just underneath the intake opening that your intake piping plugs into. Note: You will not be able to completely remove the TB and upper intake together without removing this if you have a turbo that sits high due to tubular manifold…otherwise you may be able to keep that bracket on there, not sure. Either way, pay attention to that. DISCONNECT the bracket that holds one of your wiring harnesses attaching to the TB in the back to the left of the throttle assembly.

http://www.pbase.com/image/40251763.jpg

http://www.pbase.com/image/40251972.jpg

#9: Disconnect the x4 of x5 vaccum tubes that are attached to your upper intake, most are in back. The remaining one that you will not be able to reach yet is the skinny one under the intake.

#10: Unbolt the x4 bolts (upper) and x2 nuts (lower) securing your upper intake to your lower intake. Be careful not to damage the gasket. The nut at the bottom on the backside can only be reached with a wrench, or if you have a flexible socket.

http://www.pbase.com/image/40251764.jpg

#11: Pull the upper intake off, being careful not to pull too far without disconnecting that last x1 of x5 vacuum tube that is attached on the bottom. Disconnect the tube.

http://www.pbase.com/image/40251765.jpg

http://www.pbase.com/image/40251766.jpg
.

[TSopranoIS300]

#12: Inspect all the way around to ensure you disconnected everything, then slowly pull the TB and upper intake completely off and set to the side.

http://www.pbase.com/image/40251767.jpg

http://www.pbase.com/image/40251774.jpg

#13: Use your #5 hex wrench to take off the timing belt cover.

http://www.pbase.com/image/40251768.jpg

#14: Un-screw x3 bolts holding on the black boxes (I forget what they’re called) in-between your spark plug wires and remove those.

http://www.pbase.com/image/40251769.jpg

#15: Pull out the x3 spark plug wires…remember where everything came off. Wire order from front to rear is 1,5,3 (for the spark plug wires)

#16: Check to see if you have (oil, tranny, brake, etc. fluid) spillage inside the spark plug wells so when you start taking out spark plugs, you don’t get worried if you see oil inside, thinking it’s coming from your cylinder. NOTE THE OIL SPILLAGE INTO MY SPARK PLUG WELL.

http://www.pbase.com/image/40251772.jpg

#17: Use your spark plug remover with long extension and ½” rachet and pull out all x6 spark plugs.

http://www.pbase.com/image/40251770.jpg

#18: Inspect your spark plugs for signs of anything bad going on with your engine (refer to Spark Plug section of FAQ for pictures on what they should/shouldn’t look like).

http://www.pbase.com/image/40251771.jpg

http://www.pbase.com/image/40251775.jpg

#20: Check the gap in your old spark plugs to make sure you know what you’re supposed to gap the new ones at.

#21: Check/Change the gap in the NEW spark plugs (using a wire gap space checker and gapping tool)…also ensure that the ground electrode lines up with the center electrode and isn’t pushed to one side or the other a little.

http://www.pbase.com/image/40251773.jpg

#22: Go from #17 back to #1 in reverse order.
#23: Double check all of your work, ensuring all tools are out of the engine compartment. Don’t forget to reconnect the MAF sensor wiring harness. ;)
#24: Start the car to make sure you don’t have a CEL and everything is 100%

[toyotasupra916]

what kinds of plugs and wires did u use??

[TSopranoIS300]

what kinds of plugs and wires did u use??

thats not mine......however

I believe NGK BKR6EIX pregapped to .25-.28

[michaelvanle]

Wtf's this tool?

http://www.pbase.com/image/40251773.jpg

[toyotasupra916]

what is that?? is that for gaping the plugs?? what s everyone using for plugs??stock?? am planing on using ngk Iridium IX Plug ITS 6.78 A PLUG MY PRICE list price is 16.75 each.or is it better to use stock?

[Ryan]

I use NGK 3330. I forget what gap I used, but it was between the low and high spec indicated in the manual. They have consistenly performed well for me and they are cheap.

[anthracite93]

what is that?? is that for gaping the plugs?? what s everyone using for plugs??stock?? am planing on using ngk Iridium IX Plug ITS 6.78 A PLUG MY PRICE list price is 16.75 each.or is it better to use stock?


its a feeler gauge....measures the gap...

also, atleast on non vvt-i motors you do not need to remove the Y pipe to change the plugs, removing the throttle body will do just fine.

also as someone stated before, there are 2 long bolts on top, and i believe 6 nuts on the lower side (closer to the cam covers) that need to be removed, 4 of which hold on a black metal bracket...also watch your coolant line running from the drivers side into the tb, this may spew coolant in the spark plug alley if your not careful

Jim

[toyotasupra916]

the ngk came pregaped at 40 and the supra booksay 43. so i make it 43?