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No Spark to the coil

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Old Mar 24, 2024 | 01:57 PM
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No Spark to the coil

I reinstalled the factory 305 back in my Camaro. The cars turns but no spark to the coil. I’ve replaced the ICM, rotor is good, replaced the coil and check those cables to make sure they are good and they are.

Still not getting spark, anyone have another place to look
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Old Mar 24, 2024 | 02:08 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

What’s the acv from pu coil to icm ? Icm has power to it ?
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Old Mar 24, 2024 | 02:10 PM
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Re: No Spark to the coil

ACV?
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Old Mar 24, 2024 | 02:15 PM
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Car: 1967 Camaro, 91 z28
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Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
ACV?
yes, ac voltage while cranking from pickup coil !
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Old Mar 24, 2024 | 02:18 PM
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Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

As the engine is cranking, the AC voltage readings should fluctuate between 0.3 Volts and 1.8 Volts AC
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Old Mar 24, 2024 | 03:07 PM
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Re: No Spark to the coil

Would I test it from the wire from the coil or from the ICM?

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Old Mar 24, 2024 | 03:11 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

From the pickup coil, unplugged from the icm. What has your testing consisted of ? The ignition coil primary and secondary windings were ohmed and determined faulty ?
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Old Mar 24, 2024 | 03:22 PM
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Re: No Spark to the coil

So far, replaced the ICM

I’ve taken the coil wire out and attached a spark plug to see it sparks and no fire
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Old Mar 24, 2024 | 03:26 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
So far, replaced the ICM

I’ve taken the coil wire out and attached a spark plug to see it sparks and no fire
so you don’t know if the pink wire at coil has power key on engine off or cranking .Or power at the icm ? Sounds like you’re just loading up the parts cannon hoping to find the issue.
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Old Mar 24, 2024 | 03:37 PM
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Re: No Spark to the coil

I have 12v to the coil
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Old Mar 24, 2024 | 03:38 PM
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Re: No Spark to the coil

When switch is off the pink wire has no power, when I turn the ignition I get 12v
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Old Mar 24, 2024 | 03:45 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
I have 12v to the coil
hei coil in cap or divorced coil hei ?
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Old Mar 24, 2024 | 03:47 PM
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Re: No Spark to the coil

It’s a stock Distributor,
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Old Mar 24, 2024 | 03:50 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
It’s a stock Distributor,
all stock for what ? Your vague answer doesn’t help you diagnose
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Old Mar 24, 2024 | 03:51 PM
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Re: No Spark to the coil


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Old Mar 24, 2024 | 03:55 PM
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Re: No Spark to the coil

Sorry, not trying to be vague and really appreciate your help. Just have trouble articulating the answer to your questions.
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Old Mar 24, 2024 | 03:56 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
so not even tpi, your in the wrong section.
unplug the jumper from coil to icm see if pink wire has power key on and cranking. If it does ohm or test pickup coil while cranking pu coil ohm.500 to 1500 ohm range

Last edited by Tuned Performance; Mar 24, 2024 at 04:04 PM.
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Old Mar 24, 2024 | 04:04 PM
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Re: No Spark to the coil

I have 12v on the pink wire when, not losing power there

I’m checking the pickup coil now
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Old Mar 24, 2024 | 04:09 PM
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Re: No Spark to the coil

What should it read so I have the meter on the right setting?
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Old Mar 24, 2024 | 04:15 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
What should it read so I have the meter on the right setting?
ac volts
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Old Mar 24, 2024 | 04:18 PM
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Re: No Spark to the coil

It doesn’t read anything when I put it on ACV
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Old Mar 24, 2024 | 04:20 PM
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Re: No Spark to the coil



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Old Mar 24, 2024 | 04:21 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday
It doesn’t read anything when I put it on ACV
if you were cranking the engine theirs your problem. You could ohm it to double check.
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Old Mar 24, 2024 | 04:22 PM
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Re: No Spark to the coil

If that’s the problem does that mean you have to replace the pick up coil or the whole distributor?
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Old Mar 24, 2024 | 04:27 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

You can just replace pickup coil, you have to remove and disassemble the distributor. It looks relatively new but despite it’s looks it should give a ohm reading and ac voltage while cranking.red lead on the com seems to be in the wrong spot.

Last edited by Tuned Performance; Mar 24, 2024 at 04:34 PM.
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Old Mar 24, 2024 | 05:15 PM
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Re: No Spark to the coil

So rather than get and replace the pick up I just went with a brand new distributor with everything and it still does fire. Any other suggestions?
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Old Mar 24, 2024 | 05:16 PM
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Re: No Spark to the coil

Doesn’t fire
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Old Mar 24, 2024 | 05:17 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Originally Posted by Cztheday

Your jumping the gun, vom lead was in the wrong position. If you remove the icm to coil lead does the white wire have continuity?
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Old Mar 24, 2024 | 05:29 PM
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Re: No Spark to the coil

Yes, wires test good
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Old Mar 24, 2024 | 05:34 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

How was spark tested ? Coil wire have really high resistance or open. By saying the wire ohms good how much resistance?
any change if tach is unplugged and test for spark ?
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Old Mar 24, 2024 | 07:08 PM
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Re: No Spark to the coil

Originally Posted by Tuned Performance
Your jumping the gun, vom lead was in the wrong position. If you remove the icm to coil lead does the white wire have continuity?
When you say VOM is in wrong position can you explain? What does VOM stand for? Sorry for the basic question…

Thanks again for your help
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Old Mar 24, 2024 | 07:13 PM
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Re: No Spark to the coil

When I touch the white wire it comes up with .3 ohms
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Old Mar 24, 2024 | 07:14 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

Vom is a volt ohm meter, the lead in read is in the spot for reading amps dc.
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Old Mar 24, 2024 | 07:19 PM
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Re: No Spark to the coil


I went and bought a better unit,
When I reinstall the plug with the Ingnition switch still on, I hear the fuel pump kick in.
I’m getting gas just no fire.

As for trying to get spark, took a spare spark plug and hooked it to the coil plug to see if I got a spark. That’s how I checked it.

Does the ECM need to be reset?
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Old Mar 24, 2024 | 07:29 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

The spark plug was grounded when cranking the engine? The ecm doesn’t need a reset .
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Old Mar 24, 2024 | 07:31 PM
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Re: No Spark to the coil

Originally Posted by Tuned Performance
The spark plug was grounded when cranking the engine? The ecm doesn’t need a reset .
Yes, and had no spark
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Old Mar 28, 2024 | 11:29 AM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No Spark to the coil

If the coil wire is good, you have checked acv on the pu coil. Ignition coil ohms good primary and secondary windings. It is possible that the new distributor has a bad icm.
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Old Mar 28, 2024 | 06:26 PM
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Re: No Spark to the coil

If you short the two meter leads while in an "ohms" scale, does the meter indicate zero?
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