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Checking spark 

 

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 Post subject: Checking spark
Posted: Mon Jan 07, 2008 2:34 pm 
Parts Gopher
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Hi all,

I was attempting to using an inductive timing light to diagnose a rough idle issue and got some interesting results.

Testing #1, timing light shows erratic spark, looks to fire "multiple times" on occasion. Using an inductive tacho shows rpm ranging between 700-1000+ (i.e. also measuring the apparent multiple sparks).

Testing #6, timing light regular spark and inductive tacho pretty solid at about 700rpm.

Note that leads, plugs, cap and rotor are all new or relatively new. Also if I open the throttle a little #1 smooths out. So either some cylinders are firing very erratically (and causing my rough idle) or the inductive tools are reading spark incorrectly? Interested to hear opinions.

Thanks,
J
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Posted: Mon Jan 07, 2008 3:04 pm 
Getting Side Ways
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i assume you bridged the two points in the diagnostic connector?

Maybe the wire is not on the connectors properly?
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Posted: Mon Jan 07, 2008 4:26 pm 
Parts Gopher
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Age: 40

Posts: 51

Joined: 10th Mar 2005

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Ride: Falcon Futura EL

Location: Sydney
NSW, Australia

FordFairmont wrote:
i assume you bridged the two points in the diagnostic connector?


No, I was looking for a regular / consistent spark and not overly concerned with actual timing.
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