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The mkiv Supra Owners Club

Changing the Plugs


Vaughany
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I am doing all my own servicing, well the bits I feel comfortable about doing myself. I was wandering how often should I been changing my spark plugs or is it the case of them checking them regularly and replacing them when they looked f##ked.

 

If this is the case what am iL ooking for that will determine if the plugs are in good or bad order.

 

Thanks

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If you're going to the trouble of taking the plugs out I'd say replace them with new ones anyway.

As to how often they need replacing, it depends on a few things like for example how much boost you're running the car at and what type of plugs you're using. I've just put some Denso Iridium plugs in mine and they're alledgedly good for 20,000 miles

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Jake

 

thanks for the info, I am running Trust Racing plugs Number 8 and they have been on the vehicle for 7000 miles. I thought I new where the plugs were situated but on investagation, I haven't a clue.

 

I took the plastic cover off that covers the pulleys etc as I thought they would be situated under there but I could'nt see anything obvious unless they are well disguised. can you shed some light on this for me aswell.

 

Thanks

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Originally posted by Vaughany

I thought I new where the plugs were situated but on investagation, I haven't a clue.

I took the plastic cover off that covers the pulleys etc as I thought they would be situated under there but I could'nt see anything obvious unless they are well disguised. can you shed some light on this for me aswell.

Here you go mate :

http://sl.wus0.com/quclk.go?rd=http://www.mkiv.com/techarticles/spark_plugs/index.html&res=18&crid=400370dd35f5b191&pos=2&mr=10

 

Take note of the bit about the crankcase hoses, mine had already been bodged up by the previous owner

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Originally posted by toyotasuprauk

Do you have a TT or a NA as its a very different job, takes much longer on the NA.

Good point! I never even considered that it might be a N/A

http://www.mpaconsultancy.co.uk/iamstupid.gif

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Everyone's gotta start somewhere Dude :) Seems to me Vaughany has had a poke around the engine himself, got his hands dirty, is man enough to realise he doesn't know enough yet, and has asked on here for assistance in a reasonable fashion. Fine by me.

 

My first real mechanic work was a BHG on a MkIII so Mr V has picked a far more reasonable starting point :)

 

-Ian

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c/p ed from http://www.mkiv.com:

 

1. buy 6 new spark plugs from toyota (toyota part number # 90919-01178) or by choosing from section 1 above. also buy 2 crankcase hoses, toyota part number 12263-46010 & 12264-46010 (if needed)

2. with allen wrench (5mm) remove top cover of engine,10 screws.

remove the two crankcase vent hoses that run between the valve covers.

3. using small screwdriver, release the wiring harness clips.

unbolt the ignition coils (coil packs). there is a 10mm bolt on each side. there are 3 coil packs.

disconnect wiring from the coil packs. two connectors per pack.

lift out coil pack.

4. use deep well 5/8th socket to remove plugs.

5.gap (if needed) and install the new plugs (torque it to 13 ft/lbs). stock plug gap is .043 or 1.1mm, for bpu try stock gap or a lower setting like .035 if your engine is missing.

6. install coil packs... make sure you have a good seal on the plug.

7. connect wiring and re-clip wiring harness(2) to clip. make sure each harness routes *below* the crankcase vent.

8. install crankcase hoses that you bought (or previous ones if they are not cracked).

9. re-install cover.

 

Not hard to do, take your time and be delicate with the clips, you'll be fine. :)

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Originally posted by Ian C

Everyone's gotta start somewhere Dude :) Seems to me Vaughany has had a poke around the engine himself, got his hands dirty, is man enough to realise he doesn't know enough yet, and has asked on here for assistance in a reasonable fashion. Fine by me.

 

My first real mechanic work was a BHG on a MkIII so Mr V has picked a far more reasonable starting point :)

 

-Ian

 

Agreed Ian and all well and good in theory but servicing is not just about keeping it running sweet its also a safety check , the sup is complicated expensive bit of kit , if people want to experiment with servicing they shoul stick to the petrol lawnmower in the shed , they dont tend to kill people when they go wrong !!!!!:eek:

 

Dude:flame Dev

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Cheers Ian for the support, I agree with you, everyone has to start somewhere and that is one of the advantage of the Forum, it gives advice to people who dont know as much and usually gives links that offer step by step guidelines.

 

Dude, when I say servicing I am talking about oil changes, changing the ATF, checking and changing the brake pads. All of which I had never done on a Supra until I watched a specialists, got advice, quizzed them and done it myself.

 

I am on a learning curve but feel confident on doing the basic servicing and safety checks. I admit more complicated matters I would leave to a specialists but I am not going to pay someone £50 a hour to change the oil for me.

 

Even the specialists had to start somewhere, dont get me wrong when I do something for the first time I will always have a specialists there for guidance and to ensure it is done correctly. I agree with you that the Supra is a specialists piece of machinery and I definitely dont want to blow it up or risk injuring others.

 

I hope you see my point.

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  • 2 weeks later...
Originally posted by merckx

They're not particulaly cheap!

 

No point in wasting money if they are OK.

Mate, you're the king of digging up old threads! :D You restarted one the other day that had lain dormant for over a year!

 

 

Anyway, about the plugs; I wouldn't bother putting 7000 mile-old plugs back in. Chances are you'd have to take them out and replace them fairly soon after. Who wants to mess about for 30-40mins taking their plugs out and then have to do it again a few weeks later? If £30 to £60 for a set of plugs is a lot of money to somebody I'm surprised they can afford to run a Supra.

 

Good plugs aren't a luxury item on these cars!

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Jake

 

 

The threads only 16 days old!:D

 

For the new members like myself who have just got a Supe, then the only way to get as much info as poss about these cars is to look back through the old threads.

 

When a new member asks a common question that's been asked many times before, they are pointed toward the Search button.

 

 

So if you can add something to an old thread that some of us haven't read before then why not?

 

 

Never said I would put 7000 mile plugs back in!

 

Just got my car 4 weeks ago, I know the plugs had just been changed .

 

The condition of the plugs can give you an indication of how the engine is running

 

Out of interest I thought I would have a quick look- it would be a liitle wasteful to replace them.

 

Nice to have a bit of an argument- stimulates the blood!

 

:D

 

Just curious, which thread did I revive that had lain dormant for over a year?:D

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Originally posted by merckx

Jake

The threads only 16 days old!:D

 

For the new members like myself who have just got a Supe, then the only way to get as much info as poss about these cars is to look back through the old threads.

 

When a new member asks a common question that's been asked many times before, they are pointed toward the Search button.

 

So if you can add something to an old thread that some of us haven't read before then why not?

Fair comment mate. I was just kidding with you

It's great to see folks actually looking for the answers themselves :thumbs:

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Originally posted by merckx

Never said I would put 7000 mile plugs back in!

The OP is quite a new guy to and I kind of assumed he didn't know when the plugs were last changed. He later said that they were 7000 miles old.
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Sometimes I just cannot resist replying to some of the threads.

 

:)

Never realised it was that old, :eek:

 

I'll have to bear this in mind in the future

 

Found the past threads very useful, better than any manual.

 

Not much of a tip about the plugs!:)

 

I wish I could afford to buy new plugs, owe money everywhere after buying the car!:eek:

 

Read so much about the Nur Spec R, wouldn't mind getting one on the plastic though. :D

 

Like someone said on an "Old Post"- "You'll want more"

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