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Old 20th April 2010, 18:24   #11
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remove the black plastic spark plug cover on the top of the engine,you will need at least a 6'' extension bar to reach the plug.number four is the furthest away on the right.

put a standard plug in and check code reader for miss fire.

i would advise you change all the plugs to NGK platinum for optimum life.
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Old 29th July 2010, 21:00   #12
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finally got around to this, have had no problems with a misfire but its time to change them anyway, just over 60k now.

Problem is that my wrench doesnt fit down the hole! Can anyone tell me the size socket and wrench I need? Then im sure i can find one.

Also someone mentioned ngk platinums, where is cheapest to pick them up from?

Many thanks
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Old 29th July 2010, 22:41   #13
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Quote:
Originally Posted by dunkydoo View Post
finally got around to this, have had no problems with a misfire but its time to change them anyway, just over 60k now.

Problem is that my wrench doesnt fit down the hole! Can anyone tell me the size socket and wrench I need? Then im sure i can find one.

Also someone mentioned ngk platinums, where is cheapest to pick them up from?

Many thanks
you will need something magnetic to to retrieve the plug from the hole ..
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Old 30th July 2010, 20:52   #14
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10MM extended socket and 6" extension bar needed, I changed my plugs today. I have had a few problems with the car like missfire No2 cylinder, then the engine management light coming on then going off when i put a better grade fuel in only for it to come on again so I changed the plugs and two HT leads, WOW engine management light went off so I pulled away gave it a bit of gas UUmmm no problems so I wellied it Fantastic no lights on the display and not a single hic burp or f@rt, Sooooooooo happy now, I hope you get yours sorted, the old plugs were champion( garage man says they are cr@p) put in NGK.
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Old 30th July 2010, 21:25   #15
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Quote:
Originally Posted by chrissyboy View Post
you will need something magnetic to to retrieve the plug from the hole ..
you dont need to use a magnet if youve got a spark plug socket. thet have got a bit of rubber inside the socket so it grips it when you pull it out
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Old 15th October 2019, 12:51   #16
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Ok... any ideas... same fault but definitely got a misfiring... changed coil packs over still stays on cylinder 4.. changed the plug.. changed the lead.. still have a misfire.. when plug is in lead and put to earth bright spark ..

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Old 15th October 2019, 13:19   #17
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Originally Posted by Damian-c15 View Post
Ok... any ideas... same fault but definitely got a misfiring... changed coil packs over still stays on cylinder 4.. changed the plug.. changed the lead.. still have a misfire.. when plug is in lead and put to earth bright spark ..

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Mis-fire on no.4 sometimes indicates an inlet manifold gasket leak
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Old 15th October 2019, 13:34   #18
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Mis-fire on no.4 sometimes indicates an inlet manifold gasket leak
Thank you .. had same problem before and have just replaced engine as told it was probably head ... but still got same fault.. driving me crazy now...

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Old 16th October 2019, 12:36   #19
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Following this. I have a ZR 120 that is playing up, it's fine on tick over but misfires under acceleration up to 2500 rpm, the misfire then goes. I've tried everything and can't find the problem.
I have just been told that it might be a bad injecter not atomizing the fuel correctly.

Pete.
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Old 16th October 2019, 18:05   #20
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Quote:
Originally Posted by suzublu View Post
Mis-fire on no.4 sometimes indicates an inlet manifold gasket leak
Agree, take plugs out and compare, No.4 will be lovely and clean if there's a coolant leak into it.
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