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Old 11-23-2011, 08:07 PM
gnx158 gnx158 is offline
 
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Default New gm ignition module car won't start

Talked to highway stars today and they sent me here and also said to check with scott keller on this. Story is I my tach doesn't work so I was told buy a GM module. Car ran excellent to this point. So I ordered new coil pack and ign. module both ac delco from highway stars. Installed on the car and It won't start, sounds like the car is fighting itself. Put my old aftermarket module on with new coil pack and the car fires right up. So I try the new module again and now have triple checked my connections to coil pack and all are where they belong. Car still will not start with the new module.. It cranks fast then slow then fast , sometimes pops but nowhere near running. What are your thoughts or could it be a bad module? Thank you
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Old 11-24-2011, 06:37 AM
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Lightbulb Re: New gm ignition module car won't start

This behavior sounds a lot like the firing order being off.

I realize you stated that you checked it extensively; not doubting you. Perhaps the module is wired with the wrong trigger wire order?

What I would consider doing is:
- Unplug the fuel pump at the tank.
- Try to start the car. It may start breifly, but will die.
- Get three noid lights for the plug wires, or just use an uninstalled plug in a wire end and somehow connected to ground for each of the coil section 'pairs'. i.e. One on each plug on one side of the motor. The "other" wire in each pair needs to be connected to an installed plug to insure grounding. The ignition fires three times per rotation, not six. The "other" plug of each pair fires on a cylinder that is not being sent fuel, and is just 'wasted'.
- Observe the plugs for spark with each module installed properly while someone else cranks it breifly. My guess is that they won't fire the plugs in the same order.

Easier choice (but cost is involved) is to get a Casper's Electronics igntion tester. It can do this same thing without having to be connected the car, only its battery. It has gaps in the unit that display the sparks as they occur. I have traced down issues in cars (usually a dead pair) using this many times.

I don't recall any module having the module-to-coil wires colored in a different order than the GM unit, but it may occur.
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Old 11-24-2011, 06:42 AM
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Unhappy Re: New gm ignition module car won't start

Quote:
Originally Posted by gnx158 View Post
Story is I my tach doesn't work so I was told buy a GM module.
Most aftermarket modules (including that sold by Highway Stars) do not use the external tach output. But the GM/Delco ones have always had it. An annoyance, but should not prevent the car from running.

Sadly, you have the reverse issue. Your OEM module is giving you fits.
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Old 11-24-2011, 07:56 AM
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Default Re: New gm ignition module car won't start

Any chance the wiring between the coil pack and module are wrong?
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Old 11-24-2011, 10:40 AM
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Default Re: New gm ignition module car won't start

I'm with Dave ... I'd check that wiring (with his diagram). If not, the module is bad, since swapping to a known good one fixes the problem.
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