Plug Replacemant LC 100

Hey JD,

Check that there is no water sitting down those long spark plug holes shorting out when current hits the plug top. Had a similar problem in my 100 series. Put the plug spanner down the hole pulled it out and was wet. Front cylinder in my case.

Stuart

Thanks Stuart,

Have taken out No 1 and 2, can't reach the other 4. Both the ones I tok out look OK at the pointy end but the body of both looks a very dark brown burnt colour. The have been in since new, Done 55K I would suggest new plugs might fix the prob. But will have to wait till monday and have Mr Toyota have a look.

Regards

JD

You are talking about the electrode end yes. I.E the electrode is a brown/grayish-tan colour then this is normal for used plugs and thay are running fine.

If you have deposits or Glazing on the plugs then this is another problem and depending on what sort of deposit will help point you in the right direction.

I would change the plug’s and see how that goes then start looking at lead’s, O2 sensors, MAF sensor, Fuel system, emission control.

Possibilities include.
Clogged fuel filter
Incorrect ignition timing
Stuffed leads
Emission system playing up
Bad compression
Faulty coil/ distributor or PCM
Dirty fuel injectors
Low fuel pressure
And a few other things.

These are just general things that may cause what you are describing, I am no Toyota mechanic, so perhaps somebody who has had this problem before on a 100 Series will come out and say exactly what it is.

You dont have to remove the bonnet to replace the plugs, but you do have to remove some of the gear which covers that central area. PITA, so I guess this is why they use the special - read expensive- plugs (try for trade price at Repco) so you dont have to replace them so often. Also check your filters (air and fuel).

If you cant change plugs obn a hundred series , i would have hatted to see you try a ford XC V8 with air and steer lol .

What do you meen , I dont want to get into the engine bay ?

Get in there son , and you will see how easy it actually is . I wasnt able to change number 0ne plug withought getting into the engine bay lol on my cruiser

Stand on a milk crate or better still, use a step ladder and climb onto bullbar.
Put a towel or blanket on guards so belt buckle / rivets on jeans don't scratch duco.
Remove the air inlet crossover pipe.
Undo the two covers over the plug leads.
Undo the ignition leads seperator brackets that are bolted to the top of the rocker cover.
Remove leads (grasp firmly at the ridged top section, some may need multi-grips if tight)
Thoroughly blow out plug recesses with compressed air FIRST as any accumultaed crud will go stright into the combustion chamber when you take out the plugs.
Use a plug socket with the rubber retainer grommet in it.
Remove and inspect sparkplugs.
Renew if necessary.
Follow procedure in reverse to reinstall.
Test drive.