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 Post subject: Spark plugs
Posted: Fri Mar 11, 2011 12:25 am 
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Hi guys

I have LPG on my EF Fairmont. Now it is running really rough and almost idling below 1k. If i put the foot down, sometimes it takes a second to kick so im looking at replacing the spark plugs.

Just wondering, because it is on gas, il need certain spark plugs. Im curious as to whether there are decent brand plugs i should look at getting?

thanks
daniel
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 1:29 am 
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Look at the NGK ZGR6b-11 I think the part number is. Also, close the gap up to about 0.8mm, don't run the factory gap of 1.0 to 1.1mm, it's too wide for lpg.

It's the plug NGK spec for the Xr6 models & LPG falcons. Just make sure you close the gap up to 0.8mm and you have good leads also. My EB I6 duel fuel runs nicely on them on LPG @ 0.8mm gap.

Cheers

ToranaGuy

 

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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 9:33 am 
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Ok thanks mate

And just to re gap the spark plug, is it as simple as getting a ruler and closing it to the 0.8mm ?
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 11:38 am 
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You can get a cheap spark plug gap gauge from Supercheap or Ripco, or can use a normal feeler gauge in a pinch.

LPG is apparently very sensitive to weak spark, so consider replacing your ignition leads if you haven't done so in the last year. Bosch Motorsport and Champion Steel Core and other low-impedance leads should be good for LPG.

Your coilpack could also be suspect. They commonly go bad.

 

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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 11:56 am 
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Sweet thanks for the tips

I will definitely get the coil pack changed and is that something i can do to save some cash?

Also, going from the interior side out, the second and third spark plugs seem to be very hard to get out. the other spark plugs were fairly easy to get out but these seem to be stuck in. Im wondering if there are any tips in loosening them other then force.
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 12:02 pm 
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daniel000 wrote:
Sweet thanks for the tips

I will definitely get the coil pack changed and is that something i can do to save some cash?

Also, going from the interior side out, the second and third spark plugs seem to be very hard to get out. the other spark plugs were fairly easy to get out but these seem to be stuck in. Im wondering if there are any tips in loosening them other then force.


Spark plugs & cylinders are numbered from the front to the rear.
Soak the plug in WD-40, Use a good quality good fitting spark plug socket and a short extension bar. Apply force gradually, don't hammer or yank at the wrench. The last thing you want to do is break the plug off in the head

 

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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 12:20 pm 
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me and my brother have sparyed the wd 40 and it still wont budge, it seems to be slipping a bit but with little movement so nothing has snapped. im just confused as to what to do as one of the plugs porcelain has chipped away
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 12:26 pm 
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give it time to soak into the threads.

What sort of spark plug wrench are you using?

 

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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 12:31 pm 
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Ok then im worried we have snapped the spark plug thats all.

Its a sidcrome one, size is 13/16"
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 12:36 pm 
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sorry this has become like a chat forum, we have got one of the broken ones out (just the white park was broken) so i think your right we just have to be patient and wait for the wd40 to soak in
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 Post subject: Re: Spark plugs
Posted: Fri Mar 11, 2011 10:52 pm 
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Cool hopefully the other one came out also

 

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 Post subject: Re: Spark plugs
Posted: Tue May 03, 2011 2:25 pm 
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i use BP6EY NGK in my EFII fairmont wagon running straight gas. I gap them at 0.8mm
Would there be any advantage to using NGK ZGR6B instead??
I havent had any problems with the bp6ey's. i change them around every 20000km.

You probably have that plug out by now but I recommend loosening it say 1/8 or 1/4 turn at a time then tighten it the same amount then next time go 1/2 turn the back 1/2 or 3/4 turn then repeat. this usually works when removing seized bolts. if you feel like its going to break off try some heat in that area with an oxy. don't go overboard, just a lil heat helps. this is not ideal but you don't have much choice.
to avoid this happening in the future its always a good idea to put some silver loctite anti-seize on the threads and don't over tighten them. just do what it says on the spark plug box.
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