Ignition Module ground ??
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Intermediate
Joined: Sep 2006
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From: Jacksonville Fl
Ignition Module ground ??
On a 96 LT-1, With ignition key turned to the ON position, should the Black/white wire on the ignition module show grounded or not grounded when the ign mod connector is unpluged and everything else is normal?Mine is showing grounded in both the On and Off position, also I lost my Tach reading on the drivers display. What puts the signal to the Tach ? I tried to disconnect the Tach but not sure where to do it. This was suppose to be part of a flow chart for a no fire to the coil condition.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
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From: Kempner Texas
On a 96 LT-1, With ignition key turned to the ON position, should the Black/white wire on the ignition module show grounded or not grounded when the ign mod connector is unpluged and everything else is normal?Mine is showing grounded in both the On and Off position, also I lost my Tach reading on the drivers display. What puts the signal to the Tach ? I tried to disconnect the Tach but not sure where to do it. This was suppose to be part of a flow chart for a no fire to the coil condition.
Jake
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Joined: Jan 2007
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From: Mesa Arizona
Im not sure about the ignition setup on a '96 but on my '88 setup if i hook an analog voltmeter to the tach wire and ground the other lead it will pulse when the engine cranks or runs. guess you could do the same test with a test light.
Le Mans Master
Joined: Jan 2006
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From: Orlando FL
This is normal. The wire will always show ground regardless of key position.
The Tach is a function of the Ing coil. The engine would have to run to get the pulse from the coil, to the Tach filter to be processed by tach.
The Tach is a function of the Ing coil. The engine would have to run to get the pulse from the coil, to the Tach filter to be processed by tach.
Thread Starter
Intermediate
Joined: Sep 2006
Posts: 41
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From: Jacksonville Fl
It will not run and I cannot find a Tach filter. IT was running good for about 15 minutes and would shut off and when cooled down would always start backup. This is why I started fooling with the ign coil and module. I replaced both. After replacement I actually got car to run for about 45 minutes and then it shut down. Somewhere I lost the Tach reading.. Now it will not fire at the ign coil. Also my hand scanner a ( Innover 3030 OB 2 ) will read 3 systems but can not read the other systems so now I'm wondering if the PCM is bad or something blown..
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
It will not run and I cannot find a Tach filter. IT was running good for about 15 minutes and would shut off and when cooled down would always start backup. This is why I started fooling with the ign coil and module. I replaced both. After replacement I actually got car to run for about 45 minutes and then it shut down. Somewhere I lost the Tach reading.. Now it will not fire at the ign coil. Also my hand scanner a ( Innover 3030 OB 2 ) will read 3 systems but can not read the other systems so now I'm wondering if the PCM is bad or something blown..
That's the variable that needs looking in to. What would cause HEAT to do this? Think along those lines.
In other words, what changed from the time you started the engine and the time it shut off? What happened during that time that caused it to shut down? Whatever it was is the cause of your problem.
Jake
