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View Full Version : Ignition coils HELP , misfire / backfire



busa paul
18-02-2009, 12:09 AM
have been having problems with misfire and back fire on a regular basis .
have fitted new plugs ngk 7eixs or something like that ,

have replaced fuel filter was rotten

so now have checked coil packs
and got the following readings

primary
620 ohms
650 "
720 "


secondary

21000 ohms
20000 "
19500 "


can any one please tell me what the readings are supposed to be
or any possable other reason for the misfire / backfire

peter thomson
18-02-2009, 12:21 AM
Those figures are not too far off what I measured when I was looking for a fault. Turned out to be the fuel pump in my case.

bigoxo
21-02-2009, 10:33 AM
One of my coils cracked and used to arc off a nearby bolt at times, causing a misfire. You could see a tiny white spot where it was arcing from. or get someone to rev it while you watch for the arc....course it could be the fuel pump - like peter said.

busa paul
21-02-2009, 08:29 PM
got me some replacement coils all of his measured 580 ohms and 22k
misfire now missing !!! runs better than ever , and noticably better on fuel
/rally
so up for grabs 3 used coils (one dying ) :afro:

karlous54
08-06-2009, 09:49 AM
How do you test the secondary side of the the coil packs ? do you need a fairly good meter to do this ?