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Username Post: Spark Tester        (Topic#359002)
go_hercules 
Contributor
Posts: 119

Reg: 10-27-16
12-01-19 04:28 PM - Post#2781344    

I have one of those adjustable gap spark testers that you can screw in and out and watch the spark jump a gap of 10, 20, 30, and 40KV. If I wanted to test my 1990 C1500 5.7 single coil, could I plug this tester into the coil wire, ground the other end and crank it over to look how strong the spark is? I think if I ground it, then I won't damage the ignition module, correct??? Thanks.



 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2784
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
12-01-19 04:49 PM - Post#2781345    
    In response to go_hercules

Should be fine.
That spark is the same that is output from the cap.
As long as it is grounded

Old School GM fan FOREVER


 
go_hercules 
Contributor
Posts: 119

Reg: 10-27-16
12-01-19 08:54 PM - Post#2781364    
    In response to rockfangd

Great. I want to check the output when it's cold and compare it to when it's hot. Have a hot re-start issue that I've beat to death, so this is a reach but worth checking.



 
IgnitionMan 
Valued Contributor
Posts: 3688

Reg: 04-15-05
12-02-19 06:57 AM - Post#2781379    
    In response to go_hercules

I suggest to remove the coil from the vehicle, find a parts store that has an off vehicle coil tester, run the coil, let it get up to operating temperature. This is the only accurate way to test the coil.

When you are confident it is not a coil issue, then run the inline tester on the whole system on the car.



 
go_hercules 
Contributor
Posts: 119

Reg: 10-27-16
12-02-19 01:02 PM - Post#2781398    
    In response to IgnitionMan

Okay, I will check the local stores to see if anybody still does any testing still. I remember a couple years ago trying to find a store to test an ICM and could not find anyone. If I do find someone, how would I test it hot? Drive it there, and pop it off and let them test it hot?



 
IgnitionMan 
Valued Contributor
Posts: 3688

Reg: 04-15-05
12-03-19 10:06 AM - Post#2781435    
    In response to go_hercules

Let the coil run on the tester to get it to operating temperature, and while testing, listen to the spark.

Don't let the store tech just do a 5 second burst, and declare the coil good. Most coil problems occur at operating temperatures, and/or higher RPM levels.



 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2784
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
12-03-19 06:35 PM - Post#2781467    
    In response to IgnitionMan

I agree if you can find one.

Old School GM fan FOREVER


 
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