having spark problems with my 97 lt1
07-31-2011, 11:45 PM
#1
Staging Lane
Thread Starter
iTrader: (4)
Join Date: Sep 2010
Location: INGLEWOOD
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
having spark problems with my 97 lt1 i have a brand new msd coil brand new opti ,plugs and wires dont let me forget about the ignition module.......wat else is there
08-01-2011, 01:57 AM
#4
Make sure your coil has power, and then check for corrosion at both ends of the opti harness. If all is good there verify your pcm is getting the signal from the opti, Shbox FTW again!
http://shbox.com/1/4th_gen_tech2.html#opti_test
http://shbox.com/1/4th_gen_tech2.html#opti_test
08-01-2011, 02:41 AM
#5
Staging Lane
Thread Starter
iTrader: (4)
Join Date: Sep 2010
Location: INGLEWOOD
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Make sure your coil has power, and then check for corrosion at both ends of the opti harness. If all is good there verify your pcm is getting the signal from the opti, Shbox FTW again!
http://shbox.com/1/4th_gen_tech2.html#opti_test
http://shbox.com/1/4th_gen_tech2.html#opti_test
Trending Topics
08-01-2011, 02:13 PM
#8
Staging Lane
Thread Starter
iTrader: (4)
Join Date: Sep 2010
Location: INGLEWOOD
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Do you have a test light? Can you follow a wiring diagram? If yes, go here:
http://shbox.com/1/1996_ec_03_ign_system.jpg
Al 95 Z28
http://shbox.com/1/1996_ec_03_ign_system.jpg
Al 95 Z28
08-01-2011, 03:25 PM
#9
08-04-2011, 08:49 PM
#11
TECH Apprentice
iTrader: (7)
Join Date: Jan 2005
Location: Scottsdale Az
Posts: 392
Likes: 0
Received 0 Likes
on
0 Posts
Check the wires to the cps? bad CPS?.
I mean you have just gotten defensive when asked simply what process have you followed.
From what ive read you just replaced everything.... be more in depth as to what you have done, not just "everything"
Dirty
I mean you have just gotten defensive when asked simply what process have you followed.
From what ive read you just replaced everything.... be more in depth as to what you have done, not just "everything"
Dirty
08-04-2011, 09:17 PM
#12
You obviously havn't troubleshot everything as you havn't posted any codes if it's throwing any? Let's start from there and work thru all of shbox's suggestions on his site. If you want help (as I am sure you do since you posted a message here) you need to give us more information and stop being so cryptic!!!
08-05-2011, 12:51 AM
#13
Staging Lane
Thread Starter
iTrader: (4)
Join Date: Sep 2010
Location: INGLEWOOD
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
its a 12.1 compression 396 ci lt1 i bought everything new i went and got a new harness today and computer still no spark and for some reason its not throwing any codes back
08-05-2011, 01:16 AM
#14
You need to start somewhere and work this out. I'd start at the ICM because it's easy to get to and will tell a lot. Check for power and ground first. If you have power at the ICM connector, check and make sure it's also at the coil.
http://shbox.com/1/1996_ec_03_ign_system.jpg
Sent this before, look at the ICM wiring. The wire to the coil from ICM (Pin D) should pulse when you crank it, I want to know:
Is there power at Pin A of the ICM and Pin A of the coil?
Is the ground on PIn C?
Make both of those tests with a test light. NOT A METER! Test for power by grounding one lead of the test lamp and touching the other to the terminal you want to test. For ground put the lead on something hot, like the power block on the passenger side by the battery and touching the other to the ground Pin C on the ICM. If you have both power and ground, ground one lead of the tester and put the other on the "D" pin of the OCM, the lamp should flicker on and off if you crank it. You can get the top off the ICM connector easily, carefully pull the rubber seal and get to the terminals to make the test. Do not connect the test lamp to the "B" terminal of the ICM, we'll decide what to do there later.
If you don't have a test light, make one. Just use any 12 volt lamp like a side marker or license plate lamp and a socket. It's better if it draws some current. Commercial test lamps have small lamps that don't but they are better than nothing.
Post what you find here and I'll tell you where to go from there. Whatever you do don't just start throwing parts at it.
Al 95 Z28
http://shbox.com/1/1996_ec_03_ign_system.jpg
Sent this before, look at the ICM wiring. The wire to the coil from ICM (Pin D) should pulse when you crank it, I want to know:
Is there power at Pin A of the ICM and Pin A of the coil?
Is the ground on PIn C?
Make both of those tests with a test light. NOT A METER! Test for power by grounding one lead of the test lamp and touching the other to the terminal you want to test. For ground put the lead on something hot, like the power block on the passenger side by the battery and touching the other to the ground Pin C on the ICM. If you have both power and ground, ground one lead of the tester and put the other on the "D" pin of the OCM, the lamp should flicker on and off if you crank it. You can get the top off the ICM connector easily, carefully pull the rubber seal and get to the terminals to make the test. Do not connect the test lamp to the "B" terminal of the ICM, we'll decide what to do there later.
If you don't have a test light, make one. Just use any 12 volt lamp like a side marker or license plate lamp and a socket. It's better if it draws some current. Commercial test lamps have small lamps that don't but they are better than nothing.
Post what you find here and I'll tell you where to go from there. Whatever you do don't just start throwing parts at it.
Al 95 Z28
08-07-2011, 12:08 AM
#15
Staging Lane
Thread Starter
iTrader: (4)
Join Date: Sep 2010
Location: INGLEWOOD
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
You need to start somewhere and work this out. I'd start at the ICM because it's easy to get to and will tell a lot. Check for power and ground first. If you have power at the ICM connector, check and make sure it's also at the coil.
http://shbox.com/1/1996_ec_03_ign_system.jpg
Sent this before, look at the ICM wiring. The wire to the coil from ICM (Pin D) should pulse when you crank it, I want to know:
Is there power at Pin A of the ICM and Pin A of the coil?
Is the ground on PIn C?
Make both of those tests with a test light. NOT A METER! Test for power by grounding one lead of the test lamp and touching the other to the terminal you want to test. For ground put the lead on something hot, like the power block on the passenger side by the battery and touching the other to the ground Pin C on the ICM. If you have both power and ground, ground one lead of the tester and put the other on the "D" pin of the OCM, the lamp should flicker on and off if you crank it. You can get the top off the ICM connector easily, carefully pull the rubber seal and get to the terminals to make the test. Do not connect the test lamp to the "B" terminal of the ICM, we'll decide what to do there later.
If you don't have a test light, make one. Just use any 12 volt lamp like a side marker or license plate lamp and a socket. It's better if it draws some current. Commercial test lamps have small lamps that don't but they are better than nothing.
Post what you find here and I'll tell you where to go from there. Whatever you do don't just start throwing parts at it.
Al 95 Z28
http://shbox.com/1/1996_ec_03_ign_system.jpg
Sent this before, look at the ICM wiring. The wire to the coil from ICM (Pin D) should pulse when you crank it, I want to know:
Is there power at Pin A of the ICM and Pin A of the coil?
Is the ground on PIn C?
Make both of those tests with a test light. NOT A METER! Test for power by grounding one lead of the test lamp and touching the other to the terminal you want to test. For ground put the lead on something hot, like the power block on the passenger side by the battery and touching the other to the ground Pin C on the ICM. If you have both power and ground, ground one lead of the tester and put the other on the "D" pin of the OCM, the lamp should flicker on and off if you crank it. You can get the top off the ICM connector easily, carefully pull the rubber seal and get to the terminals to make the test. Do not connect the test lamp to the "B" terminal of the ICM, we'll decide what to do there later.
If you don't have a test light, make one. Just use any 12 volt lamp like a side marker or license plate lamp and a socket. It's better if it draws some current. Commercial test lamps have small lamps that don't but they are better than nothing.
Post what you find here and I'll tell you where to go from there. Whatever you do don't just start throwing parts at it.
Al 95 Z28
