Reference to Distributor????
Thread Starter
Advanced
Joined: Jan 2007
Posts: 85
Likes: 0
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?
Advanced
Joined: Dec 2006
Posts: 71
Likes: 0
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.
Thread Starter
Advanced
Joined: Jan 2007
Posts: 85
Likes: 0
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?
Advanced
Joined: Dec 2006
Posts: 71
Likes: 0
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.
Thread Starter
Advanced
Joined: Jan 2007
Posts: 85
Likes: 0
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!!???
Advanced
Joined: Dec 2006
Posts: 71
Likes: 0
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.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski