I had this problem with my 97 Jimmy. It is your ignition switch. The switch that touches the tumbler gets wore down. You'll have to tear the steering column apart to get to it and you will need a really small torx driver (not sure what size). Good Luck.
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If you take coil wire loose from distributor cap and hold close to engine ground, engine cranking, does a spark jump? If it does, make sure rotor turns when you crank it. The pink wire at the coil goes hot with key on, that is primary voltage, use a test light, is it hot? That voltage comes from ecm fuse1--15 amp, check voltage with key on.
If sensor issue, my first thought would be the crank sensor. Just my opinion.
Sounds like the security system is causing your problem. Is the "security" light flashing? If it is, turn the key on, leave the key in the ON position for 10 minutes. The light will stop flashing. Now, turn OFF the key, turn it back to ON, and then crank it. It should start. If the security light starts flashing again, go through the process again until it starts. This is resetting the security system after the battery has died, battery has been changed, radio was changed, instrument cluster was removed and replaced, etc. Hope this works for you.
First does the rotor turn when cranking engine?? possible timing chain is out or stripped gear..are you sure it has no spark??did you verify this with a high output spark tester ? did you spray starting fluid in the tbi unit ?
you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.
I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.
Connect a timing light to the number one plug wire and crank the engine. Does the light flash indicating that the Number one is firing? Look at the distributor. If you have a distributor cap and rotor assembly remove the distributor cap and crank the engine. If the rotor turns check the rotor to make sure there is a good contact point and check the distributor cap to ensure there are good contacts. If either is damaged or worn replace them both. If the rotor does not turn you have a broken timing belt or one of the timing belt/chain guides has jammed and the engine needs to be rebuilt.
the igniter... if you have no spark 9/10 times it's the problem take Distributor cover off.. turn the crank until you can take the small screw off the rotor.. take the rotor off. and you should be able to see the igniter.. its a small box looking think with 2 or 3 phillips screws going to it with wires.. if there is a burn mark on it.. like it's got hot... it's bad i've replaced hundreds of those for the same problem. but while your in there make sure the rotor and cap is good too..
I changed all the parts I mentioned and finally I decided to try the crank shaft sensor and if that didn't work I was going to replace the cam shaft sensor. Luckily the crank shaft sensor worked but only after I replaced all the other parts. But at least now it finally started.