Ignition Module 2 cooked?
02-08-2007, 01:33 AM
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Car: 1988 Camaro IROC LB9 F
Engine: 305 HO EFI
Transmission: TH700R4
Axle/Gears: GU5 LS 3.23
Ignition Module 2 cooked?
I've have a 1988 IROC Vert 305 TPI, I had a engine fire a year back which was all repaired by Auto-Electrician without any apparent problems. About 10 months ago I fitted a Crane Fireball Hi-6 CD ignition using the LX92 high energy coil. Since then I have replaced the stock ignition module (external HEI) once and now the second one has failed.
I am assuming that this is a case where the stock GM module is not up to the task of switching the the higher current demand of the coil?? Failure seems to occur during startup..in any case on both occasions the car ran fine and the fault only became apparent when I went to restart (cold).
I have ordered a Accel 35362 performance ignition module hoping that it will handle the load, I'm also considering using a 1.2 ohm ballast resistor to reduce the current load a bit further. I can always go back to stock, but I'm stubborn and want to beat this.
Help and suggestions gratefully received.
9 Feb 07
Just remembered...the tacho did at times fail, not moving from zero. Beginning to sound like a short between coil and module?
I am assuming that this is a case where the stock GM module is not up to the task of switching the the higher current demand of the coil?? Failure seems to occur during startup..in any case on both occasions the car ran fine and the fault only became apparent when I went to restart (cold).
I have ordered a Accel 35362 performance ignition module hoping that it will handle the load, I'm also considering using a 1.2 ohm ballast resistor to reduce the current load a bit further. I can always go back to stock, but I'm stubborn and want to beat this.
Help and suggestions gratefully received.
9 Feb 07
Just remembered...the tacho did at times fail, not moving from zero. Beginning to sound like a short between coil and module?
Last edited by Siggy; 02-08-2007 at 10:22 PM.
07-06-2010, 01:14 PM
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Car: 1990 Pontiac Firebird 3.1 V6
Engine: 3.4 V6
Transmission: Automatic
Re: Ignition Module 2 cooked?
Jips
I have exactly the same problems, but with the stock parts.
How did you solved it?
grtz, D
I have exactly the same problems, but with the stock parts.
How did you solved it?
grtz, D
07-07-2010, 10:47 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
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Axle/Gears: EATON POSI 4.56
Mmmmmm Delicious Bar-B-Qd Iggy Modules
Originally Posted by D Max
I have exactly the same problems
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If People Drove Any Slower They’d Be Going Backwards
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07-08-2010, 05:16 AM
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Car: 1990 Pontiac Firebird 3.1 V6
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Re: Mmmmmm Delicious Bar-B-Qd Iggy Modules
But it's completely stock...
Something must be damaged, but where do I start to search...
grtz, D
Something must be damaged, but where do I start to search...
grtz, D
07-08-2010, 11:31 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Mmmmmm Delicious Bar-B-Qd Iggy Modules
If the car frequently blows iggy modules the coil might be partially bad.
Whenever replacing the module, first replace the coil.
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Happy Racing!
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How bout those too scared to drive without headlights in the daytime and the ones that need headlights for a little rain
.
Whenever replacing the module, first replace the coil.
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Happy Racing!
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How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain.
07-08-2010, 11:54 AM
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Re: Mmmmmm Delicious Bar-B-Qd Iggy Modules
I don't know what he has blown, that's exactly what I need to find out.
Today I replaced the coil, but the problem stays, en my tacho still doesn't work.
Yesterday I measured the coil, but it seems fine.
I replaced it anyway.
How can you see that your iggy module is blown?
Today I replaced the coil, but the problem stays, en my tacho still doesn't work.
Yesterday I measured the coil, but it seems fine.
I replaced it anyway.
How can you see that your iggy module is blown?
07-08-2010, 12:39 PM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Mmmmmm Delicious Bar-B-Qd Iggy Modules
Today I replaced the coil, but the problem stays, en my tacho still doesn't work.
.
.
How can you see that your iggy module is blown?
However if you want, you can unplug the 4 pin connector from the distributor.
Then remove the distributor cap.
Then unplug the pickup coil from the module.
Now connect a voltmeter to the tach terminal.
Turn the key to RUN.
Using a 5 volt power supply with a small bulb in series, touch 5 volts to the innermost pin (it’s labeled P on some brands) of the module.
Now, does the voltmeter sharply decrease when you touch the 5 volts to the module?
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Happy Racing!
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How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain.
Last edited by NINÅ; 07-08-2010 at 12:42 PM.
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07-08-2010, 01:42 PM
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Car: 1990 Pontiac Firebird 3.1 V6
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Transmission: Automatic
Re: Mmmmmm Delicious Bar-B-Qd Iggy Modules
So, let's check if I understand it well:
a voltmeter between the ground and the tach terminal of the coil
Disconnect the coil from the ICM (The 2 wire connector if I remember it well)
5v Between the P terminal and the ground, with a small bulb in series
If I may ask: how small (Volts and watts) must the bulb be, and whats the function if it?
Is the P-terminal on the side of the pickup coil?
I haven't the car with me now, so I want to be sure that I not have to be guessing tomorrow.....
grtz, D
a voltmeter between the ground and the tach terminal of the coil
Disconnect the coil from the ICM (The 2 wire connector if I remember it well)
5v Between the P terminal and the ground, with a small bulb in series
If I may ask: how small (Volts and watts) must the bulb be, and whats the function if it?
Is the P-terminal on the side of the pickup coil?
I haven't the car with me now, so I want to be sure that I not have to be guessing tomorrow.....
grtz, D
07-08-2010, 02:18 PM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Mmmmmm Delicious Bar-B-Qd Iggy Modules
Yes you are understanding the procedure.
Use a side marker bulb.
The purpose is to limit the amount of current going to the module.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
How bout those too scared to drive without headlights in the daytime and the ones that need headlights for a little rain
.
how small (Volts and watts) must the bulb be, and whats the function if it?
The purpose is to limit the amount of current going to the module.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain.
07-08-2010, 05:45 PM
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Re: Mmmmmm Delicious Bar-B-Qd Iggy Modules
make sure when you install the module, you're applying dielectric grease where it mounts to the distributor. it needs this there to help with heat dissipation. without it, it will die a quicker death
07-09-2010, 03:27 AM
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Re: Mmmmmm Delicious Bar-B-Qd Iggy Modules
I have just tested the ICM(s)
Ik had 2 ICM's, an one in my other firebird.
They all had a voltage drop from 12v to 8.6v
I don't know if this fine or not...
My other firebird certainly runs fine...
grtz, D
Ik had 2 ICM's, an one in my other firebird.
They all had a voltage drop from 12v to 8.6v
I don't know if this fine or not...
My other firebird certainly runs fine...
grtz, D
07-10-2010, 11:26 AM
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Re: Ignition Module 2 cooked?
So the issue isn't that the ICM can't handle the coil, because it isn't driving the coil. There is most likely a grounding issue between the CD box and the ICM. Or the high voltage from the CD to the coil is getting fed back into the ICM (CD boxes hit the coil with about 400 volts to trigger it).
And I just noticed that this thread has been completely hijacked from the OP.
RBob.
07-12-2010, 12:14 PM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Mmmmmm Delicious Bar-B-Qd Iggy Modules
Originally Posted by D Max
I have just tested the ICM(s)
Ik had 2 ICM's, an one in my other firebird.
They all had a voltage drop from 12v to 8.6v
I don't know if this fine or not...
My other firebird certainly runs fine…
Ik had 2 ICM's, an one in my other firebird.
They all had a voltage drop from 12v to 8.6v
I don't know if this fine or not...
My other firebird certainly runs fine…
Now using the same procedure, and a spark tester (you’ll have to use a sparkplug if you don’t have a tester) connected to the ignition coil secondary, observe for spark while making and breaking the connection with the 5 volt supply.
Was there spark?
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