Reference to Distributor????
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Joined: Jan 2007
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From: Mesa Arizona
Reference to Distributor????
Hey all. I have no spark and I have checked everything I can think of so maybe its my ECM?? How many volts should the reference wire to the distributor have with the key in run?
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Joined: Dec 2006
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From: Little Rock Arkansas
Sorry about that. I believe the purple/white is the reference to the ECM from the distributor so the ECM knows when to spray the injectors. I'm going to check this on my car this weekend because I believe it may be part of my issue. There is a link on here to a site that has the pinouts/troubleshooting pdf. I believe it should pulse with a noid light when spinning over. I am saying this with the research I have done and hopefully someone more knowledgable will jump in. Here's the link...http://temp.corvetteforum.net/c4/vader86/. Vader and Agent 86 should be heavily thanked by all for posting this info!
Last edited by Moto1; Mar 13, 2007 at 09:20 PM.
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Joined: Jan 2007
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From: Mesa Arizona
So if I'm understanding that correctly.... The reference from the distributor tells the injectors to pulse?? because I am getting pulse to my injectors but no spark so that would eliminate the ECM as the problem and it would have to be coil related no?
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Joined: Dec 2006
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From: Little Rock Arkansas
Not exactly. The ignition module has more than one circuit. One pulses to the ECM, one interacts with the EST, and the other triggers the coil to fire. One of the easiest ways to check the coil is to remove the leads from the distributer and check the resistance. If high resistance is noted, the coil is bad.
Now for the ignition module:
The ignition module generates a lot of heat due to the high current flowing through it. To keep the ignition module "cooler" the distributor housing is used as a heat sink. A grease compound is used between the module and dist. housing for effective heat transfer. Over time, the grease dries up, ignition module gets hot, and the transitor dies inside the module that triggers the coil.
Maybe this helps?
Now for the ignition module:
The ignition module generates a lot of heat due to the high current flowing through it. To keep the ignition module "cooler" the distributor housing is used as a heat sink. A grease compound is used between the module and dist. housing for effective heat transfer. Over time, the grease dries up, ignition module gets hot, and the transitor dies inside the module that triggers the coil.
Maybe this helps?
Last edited by Moto1; Mar 14, 2007 at 11:35 PM.
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Joined: Jan 2007
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From: Mesa Arizona
Yes that helps alot to understand how it works but it is all brand new MSD components. I tested the ignition module at napa and auto zone both tested it good. The coil has next to zero resistence!!???
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Joined: Dec 2006
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From: Little Rock Arkansas
Then the coil should be ok. Have you verfied hat you have 12V on the + (or BAT) side of the coil? Also, check the wires that slide on the ign. module and make certain none of them are grounding on the housing. I am not that familiar with the MSD products. Something else you might try is to unplug the TPS and EST sensors and see if you get fire.
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