Question about 1995 Chevrolet Silverado 2500

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95 chev 350 tbi .i have no spark [the truck quit while driving] i have tested the coil . there is 12volts at the coil key on .i've changed the rotor and cap .new spark pluges .and changed the computer any ideas

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Hello Heath.

I see you have gone to a lot of work to solve your problem.
The ignition system on your Chev is normally quite reliable.
The computer will rarely cause a no start as all it does is change the timing through a wire to the ignition module on the distributor. All ignition is done on the engine.
Power is applied to the coil from the ignition switch and the module grounds it to fire the coil.
The most common no start issue on this system, besides the coil, is the pick-up coil and module on the distributor.
The module is pretty easy to replace but the pick-up coil requires the distributor be disassembled.
Often it's better to purchase a rebuilt distributor unit at your favorite auto supplier. They are not too expensive and it makes the job easier.
But if you are a pretty handy guy you could replace those parts yourself.
Make sure you mark the position of the distributor rotor when you take off the cap to make it easier when you put it back together. Keep in mind when you pull it out the rotor will rotate slightly, that is where you will need to position the rotor to begin on installation.
You will also need to set the timing afterward. You will need a timing light to do this.
After it is started and warmed up the computed timing connector will need to be unplugged and the timing set at 0 degrees. Then reconnect the computed timing connector.
The timing connector is a single wire sealed connector that has a tan with black stripe lead. This connector breaks out of the wiring harness below the heater case in the passenger compartment.

There you are, I hope this leads you to a repair.
Thank you for using FixYa.


Posted on Jan 03, 2011


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