Spark Tester

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gibletts

Petty Officer 2nd Class
Joined
Sep 27, 2003
Messages
158
74 135hp Starflite, I believe I have no spark on at least 1 cycl. This is only based on one cycl/spark plug being cooler to touch than the others and motor running rough. Any advise on rigging a spark testing devive? Would a timing light pick up difference between a weak and strong spark. Many thanks, dm.
 
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ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Spark Tester

For a quick check, take all of the spark plugs out and reconnect them to the wires. Then lay them against the block (you can usually set them behind the wiring but you do not want to hold them with your hand.) Then watch for spark while someone cranks. If you see fire on all four plugs, let us know.
 
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gibletts

Petty Officer 2nd Class
Joined
Sep 27, 2003
Messages
158
Re: Spark Tester

I suspect a faulty ignition coil, visually they all look in poor condition and probably need a change, I will test the plugs as you suggest thanks dm.
 
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skeezx01

Petty Officer 2nd Class
Joined
Jul 14, 2004
Messages
105
Re: Spark Tester

Have one of your beer drinkin friends hold the wire while you crank, if he/she pees their pants the spark on that cyl is good. Good test for finding spark bad for friendships though :eek:
 
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gibletts

Petty Officer 2nd Class
Joined
Sep 27, 2003
Messages
158
Re: Spark Tester

Thanks, sounds like a good idea, i think I will try that first, will start asking for volunteers lol.
 
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