ibakes
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| posted on 1/6/07 at 07:55 AM |
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Spark??
Morning
Is there any reason why when the spark plug is fitted to the engine and I attach the timing light to a plug lead the light will not be overly
reliable? sometimes not work at all, or miss every other spark.
but when the spark plug is resting against the block the timing light is perfect?
Having trouble making it run nice at the moment
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02GF74
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| posted on 1/6/07 at 08:08 AM |
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yes. when the plug is inside the engine, the spark is attempting to jump the plug gap in a compressed atmosphere that has fuel vapour. I believe
that is less favourable than when it is resting on the block when all it needs to do it jump across air at atmospheric pressure.
The lamp is triggered off by the spark so the spark is not occuring.
Over fuelling may result in petrol shorting out the spark plug contacts so no or intermittent spark.
What do the plugs look like colourwise?
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ibakes
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| posted on 1/6/07 at 08:14 AM |
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The plugs are sooty, and I know I’ve got to get the fuel down, but this also happens when the MS unit is not attached.
Defiantly food for thought tho
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Agriv8
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| posted on 1/6/07 at 09:35 AM |
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Assume you are using a coil pack of some sort ( which one ? )
I have 3 timming guns 2 of which would not work with my waisted spark coil packs ! on the v8
A general consensus is that.
1 cheep timming guns with 'No timming advance features' are Ok.
2 Middle of the road guns with 'timing advance' seem to be problematic.
3 Expensive timming guns with 'timming advance' seem to be OK
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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ibakes
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| posted on 1/6/07 at 11:15 AM |
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Appologies and using edis 4 unit
and think its snapon with timing advance (borrowed from me brother)
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rusty
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| posted on 1/6/07 at 11:16 AM |
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Are the plugs new and gapped correctly also are the leads and connection in good condition, is the coil pack well earthed.
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Agriv8
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| posted on 1/6/07 at 11:21 AM |
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quote:
Originally posted by ibakes
Appologies and using edis 4 unit
and think its snapon with timing advance (borrowed from me brother)
MMM thats a catogory 3 gun 
Have you got the pickup facing the right way ? ( the clip that you place round the ign lead ) there should be an arrow this needs to point to the
spark plug.
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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ibakes
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| posted on 1/6/07 at 11:55 AM |
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quote:
Originally posted by rusty
Are the plugs new and gapped correctly also are the leads and connection in good condition, is the coil pack well earthed.
Not new but seem to give a nice spark when out of the engine
but the coil pack is loose where ive been playing around so probably not...
quote:
Originally posted by Agriv8
quote:
Originally posted by ibakes
Appologies and using edis 4 unit
and think its snapon with timing advance (borrowed from me brother)
MMM thats a catogory 3 gun
Have you got the pickup facing the right way ? ( the clip that you place round the ign lead ) there should be an arrow this needs to point to the
spark plug.
regards
Agriv8
Have to check when I get home 
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ibakes
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| posted on 1/6/07 at 05:27 PM |
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Right tried all thoes and pretty much the same really  still it fires up
runs like a bag of poo but hopefully that is just due to overfueling (only just to get it started) as not tuned it at all must get the o2 sensor
reading correctly
thanks for all the help
[Edited on 1/6/07 by ibakes]
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DarrenW
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| posted on 7/6/07 at 11:31 AM |
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Snap on advance timing light worked well for me. Ive got an old one with digi display. Only thing i had to remember is that it reads double due to
being wasted spark, apart from that was good.
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