testing coil packs with a DVOM
05-19-2010, 07:14 AM
#1
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testing coil packs with a DVOM what kind of reading should i get from a good coil?? having some mis fires in multiple cylinders after converting back from E 85 to regular gas (converted back because of 1-2 miss firing cylinders)
05-19-2010, 09:13 AM
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All you can get from a regular DMM is simple continuity.
Don't know what normal ohms reading would be from
IGN to driven to plug terminals. But the way you'd get
a spark fault is more likely an insulation breach, which
you won't be able to see at low meter-applied voltages
most likely.
Scanning for current misfires to find the misbehaving
cylinders, and then diagnostic component-swapping,
is the way to go. Maybe borrow somwbody local's
AutoTAP, HPTuners, EFILive gear - no licenses are
needed to scan.
Don't know what normal ohms reading would be from
IGN to driven to plug terminals. But the way you'd get
a spark fault is more likely an insulation breach, which
you won't be able to see at low meter-applied voltages
most likely.
Scanning for current misfires to find the misbehaving
cylinders, and then diagnostic component-swapping,
is the way to go. Maybe borrow somwbody local's
AutoTAP, HPTuners, EFILive gear - no licenses are
needed to scan.
05-19-2010, 09:29 AM
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yeah, i have the cyl's that are miss firing going through and checking everything right now... going to get some new plugs maybe wires. oil change check springs and rocker arm tightness.
