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Old 09-03-2013, 02:07 PM
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Using a Timing Light

I want to use my inductive timing light to check for spark on each cylinder on my SBC with HEI. The directions say to attach to a wire and then start it and not to change to another while the engine is running.

Is there any issue with just moving it from one wire to the next with the car idling? i don't see what the harm would be. It just clips around the insulation. There is no direct contact. It sure seems safer than puling a plug wire off a runing engine.

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Old 09-03-2013, 02:28 PM
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Quote:
Originally Posted by Dougie View Post
I want to use my inductive timing light to check for spark on each cylinder on my SBC with HEI. The directions say to attach to a wire and then start it and not to change to another while the engine is running.

Is there any issue with just moving it from one wire to the next with the car idling? i don't see what the harm would be. It just clips around the insulation. There is no direct contact. It sure seems safer than puling a plug wire off a runing engine.
I have moved from wire to wire with my engine running with a timing light to make sure each wire was gettin spark and it didn't cause any problems. I'd just be careful when u remove it from a plug wire so you don't pull or jerk on a plug wire. You shouldn't have any problems doing it man.
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Old 09-03-2013, 02:47 PM
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Originally Posted by Dougie View Post
The directions say to attach to a wire and then start it and not to change to another while the engine is running.
Call the manufacturer and ask them why this is, then come back and educate the rest of us.
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Old 09-03-2013, 03:21 PM
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I may do that if I have time tomorrow. I'm guessing some lawyer who never checked his oil directed them put that in there.
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Old 09-03-2013, 05:12 PM
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Just my $0.02 worth ...

I seem to have enough trouble without having to go looking for it.

This may be a fairly sensitive peice of test equipment ... they even want the pickup placed on the wire with the arrow pointing to the spark plug, right?

I say shut the engine off, move the pickup to the next wire ... and restart.

I know, it's 15 seconds of your life that you'll never get back, right?
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