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94 trans am lt1. Car cranks but starter sounds like it kicks out. It's also getting no spark. I'm looking into changing the opti, coil, and icm. Any advice would be appreciated.
I had an opti fail when driving down the street.The car ran great and then I went out to get gas and it would crank but not start. I heard if the opti is bad it will miss and backfire and that's what is confusing me. It ran great and out of nowhere just stopped starting.
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Was it the opti on your car?Mine did that on my 94, ran really strong and then just died without warning.
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Typically I'd agree with 94 ta, except here. I'd start cheap and work my way towards the more expensive stuff. The icm and coil cam be changed in 10 Min, and both can be had for under $100. With the opti your looking at $400 and probably a full weekend if it's your first time.Msd or ACDelco are the only units worth buying. I would start with the opti. While the ICM could be a culprit it's not as likely as the opti.
It was, but like jhobbins said, start cheap. You can get the icm tested at most parts places, just make sure they test it a few times. They usually fail under high heat conditions. Yours may fail right off though since you have no spark. If it doesn't fail immediately, I would suspect that your issue is somewhere else probably the opti.Was it the opti on your car?
Thanks, I will try that today.You can tell if the Opti is dead without doing any real work. Just watch the tach while cranking a non-starting car. The needle should rise up slightly to about 200 rpm. If it doesn't, the Opti is dead. If it rises up but still won't start, it could be a loose rotor or something else.
The ICM has no effect on the tach reading, so that is a possibility.
This video shows how it should look. Watch the 2nd attempt to crank. The engine was prevented from starting by removing the injector fuses temporarily:
Ok, so the tach moves like you said. I changed the coil today and still no spark. I noticed the security light was flashing. I think it could be vats. I'm going to see how to reset it or bypass it.You can tell if the Opti is dead without doing any real work. Just watch the tach while cranking a non-starting car. The needle should rise up slightly to about 200 rpm. If it doesn't, the Opti is dead. If it rises up but still won't start, it could be a loose rotor or something else.
The ICM has no effect on the tach reading, so that is a possibility.
This video shows how it should look. Watch the 2nd attempt to crank. The engine was prevented from starting by removing the injector fuses temporarily: