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new plugs now misfire!

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Old 06-08-2006, 01:15 PM
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leecavturbo
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Default new plugs now misfire!

gapped to approx .6mm. misfire @ 1.17bar . no misfire @ 1bar ?
go smaller ?
ngk iridiums
Old 06-08-2006, 01:22 PM
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Coilpack or dizzi ?
Old 06-08-2006, 01:25 PM
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Jim Galbally
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iridiums are VERY prone to damage if you try and regap them.

was it missing on the old plugs?
Old 06-08-2006, 02:21 PM
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leecavturbo
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Originally Posted by Jim Galbally
iridiums are VERY prone to damage if you try and regap them.

was it missing on the old plugs?
missing ? nowt just 3 years old!
Old 06-08-2006, 02:22 PM
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leecavturbo
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Originally Posted by SECS
Coilpack or dizzi ?
coilpack
Old 06-08-2006, 02:54 PM
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Quick solution would be to bang the old plugs back in and retry. As above the iridiums dont like to be messed with,they should be gapped correctly from factory.
Old 06-08-2006, 03:45 PM
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Assuming the plugs are ok and after trying another set....

Check your AFR just before the missfire occurs ....

(not when its happening as this will show up as rich)


Dont know DTA in detail but can you adjust the coil dwell time ?

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Old 06-08-2006, 03:50 PM
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Originally Posted by SECS
Assuming the plugs are ok and after trying another set....

Check your AFR just before the missfire occurs ....

(not when its happening as this will show up as rich)


Dont know DTA in detail but can you adjust the coil dwell time ?
i think so.
Old 06-08-2006, 03:54 PM
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Cant read the text in that picture.

As you are running coil pack, the dwell time can be increased alot to
increase plug voltage. (this only works to a limit).

Do you know what the dwell time is at the RPM (not boost) that the
missfire happens at ?
Old 06-08-2006, 03:57 PM
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leecavturbo
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Originally Posted by SECS
Cant read the text in that picture.

As you are running coil pack, the dwell time can be increased alot to
increase plug voltage. (this only works to a limit).

Do you know what the dwell time is at the RPM (not boost) that the
missfire happens at ?
no , it appears set on that settings page , but i do know dwell goes up and down as i can see it when in live mode on the laptop.
Old 06-08-2006, 04:00 PM
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I would expect to see at least 6 to 8 milliseconds over 3500 rpm on a
coilpack. Try increasing the value if you can change it but you may
need to consult dta as values that are too large can burns the coils out.
Old 06-08-2006, 04:09 PM
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For some reason I can read it now -
Try setting the dwell time (coil on time) to 6000 micro seconds
(that is 6 milliseconds)
Old 06-08-2006, 07:11 PM
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Jim Galbally
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or more likely the new plugs are wanked :P
Old 06-08-2006, 10:56 PM
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leecavturbo
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sorted @ .5mm
Old 07-08-2006, 03:55 PM
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aint that a tad close for a coilpack driven car?
Old 07-08-2006, 06:04 PM
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Originally Posted by Jim Galbally
aint that a tad close for a coilpack driven car?
i don't know ? any gen ?
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