why am i not getting spark on my lt1
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
why am i not getting spark on my lt1
Bought my 95 lt1 firebird from a friend who needed the money for school, 800.00 bucks. Not bad i thought, but it's not running. ok I say I've worked on a few cars I can do this. Open hood looked like a squirrels nest, wires here and there some fried some cut, sensor wires are off. parts are off which i got. I start by reconnecting wires puting on the parts. still want run. I check to see if i getting fuel, I'm not so change fuel pump it was burnt of course. So know getting fuel. Still want run, check fuses all good I check for spark no spark. 
But everything I've checked says it should, what's not connecting not get fire to the plugs. Will engine get fire if the ecu is bad or if the cc computer is off what will cause oem engine not to fire if the ignition componets are working. Any advice would be appreicated. thank you
Registered User
Joined: Jan 2001
Posts: 237
From: Cleburne, Texas
Alright dude, Sounds like you have some serious problems and I dunno where to start. It could be a million things. Lets say everything you have hooked up is actually hooked up right and it's all working. First you need to check the plug that goes into the optispark, That is the distributor under the water pump in the front of the motor, The connector runs from the passenger side of the upper intake plenum and plugs into the top of the opti on the passenger side of the top of the opti(If that makes since) You need to get you a voltometer and check to make sure when some one turns the car over that the connector has power, if thats the case then you might wanna move on to the optispark itself. Have you checked the ignition coil and Ignition control module? How about the grounds? Is it throwing any Trouble codes(Check Engine Light) You need to make sure all of that is working before you assume it is the opti? Has the WP on the car leaked at all that you know of, that will destroy the opti pretty quick. Let me know dude.
Registered User
Joined: Nov 2006
Posts: 334
From: Roanoke VA
No fire from the plug wires, coil?? Test your way back from the opti and see if you have fire anywhere. Here's your new best friend http://shbox.com/1/4th_gen_tech1.html. Do this test to see if the opti sending a signal to the PCM http://shbox.com/1/4th_gen_tech2.html#opti_test. The test described will also let you know if the coil has 12V or not. If I'm not mistaken, pin "D" is from the coil, and should have close to 12V with the ignition on. You can test the coil like this http://shbox.com/1/coil_testing.jpg. Also make sure that there is a ground running from one of the bolts that holds the coil on, to the body. Make sure it's clean. Let us know what you find.
Last edited by ricehammer; Oct 29, 2007 at 11:54 AM.
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
No fire from the plug wires, coil?? Test your way back from the opti and see if you have fire anywhere. Here's your new best friend http://shbox.com/1/4th_gen_tech1.html. Do this test to see if the opti sending a signal to the PCM http://shbox.com/1/4th_gen_tech2.html#opti_test. The test described will also let you know if the coil has 12V or not. If I'm not mistaken, pin "D" is from the coil, and should have close to 12V with the ignition on. You can test the coil like this http://shbox.com/1/coil_testing.jpg. Also make sure that there is a ground running from one of the bolts that holds the coil on, to the body. Make sure it's clean. Let us know what you find.
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
Alright dude, Sounds like you have some serious problems and I dunno where to start. It could be a million things. Lets say everything you have hooked up is actually hooked up right and it's all working. First you need to check the plug that goes into the optispark, That is the distributor under the water pump in the front of the motor, The connector runs from the passenger side of the upper intake plenum and plugs into the top of the opti on the passenger side of the top of the opti(If that makes since) You need to get you a voltometer and check to make sure when some one turns the car over that the connector has power, if thats the case then you might wanna move on to the optispark itself. Have you checked the ignition coil and Ignition control module? How about the grounds? Is it throwing any Trouble codes(Check Engine Light) You need to make sure all of that is working before you assume it is the opti? Has the WP on the car leaked at all that you know of, that will destroy the opti pretty quick. Let me know dude.
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
Alright dude, Sounds like you have some serious problems and I dunno where to start. It could be a million things. Lets say everything you have hooked up is actually hooked up right and it's all working. First you need to check the plug that goes into the optispark, That is the distributor under the water pump in the front of the motor, The connector runs from the passenger side of the upper intake plenum and plugs into the top of the opti on the passenger side of the top of the opti(If that makes since) You need to get you a voltometer and check to make sure when some one turns the car over that the connector has power, if thats the case then you might wanna move on to the optispark itself. Have you checked the ignition coil and Ignition control module? How about the grounds? Is it throwing any Trouble codes(Check Engine Light) You need to make sure all of that is working before you assume it is the opti? Has the WP on the car leaked at all that you know of, that will destroy the opti pretty quick. Let me know dude.
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
No fire from the plug wires, coil?? Test your way back from the opti and see if you have fire anywhere. Here's your new best friend http://shbox.com/1/4th_gen_tech1.html. Do this test to see if the opti sending a signal to the PCM http://shbox.com/1/4th_gen_tech2.html#opti_test. The test described will also let you know if the coil has 12V or not. If I'm not mistaken, pin "D" is from the coil, and should have close to 12V with the ignition on. You can test the coil like this http://shbox.com/1/coil_testing.jpg. Also make sure that there is a ground running from one of the bolts that holds the coil on, to the body. Make sure it's clean. Let us know what you find.
Prove Optispark Signals Are Getting To The Coil, EVERTHING CHECKS OUT EVEN REPLACED OPTI AND COIL AND COMPUTER TO MAKE SURE. EVERTHING HAS GOT WHAT IT IS SUPPOSE TO HAVE WHAT ELSE CAN IT BE
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
YES LITE IS ON I HAVE NEVER SEEN IT OUT, NO I DINT CHECK CODES BECAUSE MY PCM WAS FRIED, HAVE SINCE PUT IN ANOTHER, BUT HAD TO WAIT TILL I GOT MY OBD1 CORD FOR MY SCANNER, I HAVE AN ACTRON SUPER SCANNER BUT IT ONLY CAME WITH OBD 2 CABLE, WHICH CANT WORK BECAUSE GM COULDNT FOR SOME REASON LEAVE THE OBD1 PLUG IN THE 95 THEY HAD TO PUT A OBD2 PLUG ON A OBD1 CAR, STILL HAVENT FIGURED THAT 1 OUT, ANYWAY GOING TO CHECK IT WHEN I GET A CHANCE. ALSO I READ UP ON IGNITION CONTROLL MOD. WHICH COULD BE MY PROBLEM. I HAVE CONSTANT HOT ON MY COIL PLUG WIRE GOING TO OPTI WHEN IGNITION IS ON, IM NOT SURE BUT THAT IS NOT SUPPOSE TO HAPPEN UNTIL THE ICM SEND THE SIGNAL RITE. SO IM THINKING ICM IS STUCK ON. ANY OPINION ON THAT. THANKS SORRY COULN'T REPLY SOONER HOLIDAYS ARE CRAZY AROUND MY HOUSE.
Last edited by roller71; Nov 29, 2007 at 06:03 AM. Reason: MISSED A WORD
Thread Starter
Registered User
Joined: Oct 2007
Posts: 36
From: new iberia, la
No fire from the plug wires, coil?? Test your way back from the opti and see if you have fire anywhere. Here's your new best friend http://shbox.com/1/4th_gen_tech1.html. Do this test to see if the opti sending a signal to the PCM http://shbox.com/1/4th_gen_tech2.html#opti_test. The test described will also let you know if the coil has 12V or not. If I'm not mistaken, pin "D" is from the coil, and should have close to 12V with the ignition on. You can test the coil like this http://shbox.com/1/coil_testing.jpg. Also make sure that there is a ground running from one of the bolts that holds the coil on, to the body. Make sure it's clean. Let us know what you find.
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