Question about 1995 Chevrolet Impala

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I have a 1995 impala ss with lt1 motor it wont start i changed the cap&rotor,starter,ingnition modulator,fuel filter and it still wont start

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  • Anonymous Apr 25, 2009

    I recently had the same would not start. I was getting a spark on some of the wires, but not all. Replacing the Optispark Distributer gave me intermittent starts...worked fine for the garage every time. Have had the car towed back 3 times because of this. Problem turns out to also be a bad fuel pump. Fuel pump was only intermittently sending enough fuel to start and keep engine running.

    Good news, though, is that the airconditioning system is still leak free for the last 14 years. So I got that going for me.



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First thing I'd check is the optispark sub harness. Check both connections, the one by the optispark and the one on the passenger side of the intake manifold. Disconnect both sides and check for corrosion. This is a known weak spot on these motors.

If that checks out your going to want to start with the basics. Do you have spark and fuel? Pull the spark plug wire for a cylinder and using a spark tester test for spark while cranking. You want to have a nice blue spark. If you have good spark check for fuel pressure by hooking up a fuel pressure gauge to the shrader valve on the fuel rail. It should be in the high 40s - low 50s. If you have fuel also, check to make sure the injectors are getting a pulse using a noid light.

Posted on Apr 16, 2009

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If you do have spark and fuel pressure then disconnect the coil and lift the injectors out still connected to the rail and turn over the engine to see if they are are clogged or have a nice spray. make sure to disconnect the connector to the coil or you could start a fire.

Posted on Jul 22, 2012


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SOURCE: my 1995 impala wont start

have someone listen for the fuel pump to turn on when you turn the key to the on position if you don't hear it then you may need to replace it.

Posted on Apr 14, 2009

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This sounds like you may have fuel at the rails, but do you know if the injectors are opening? You can assumed that the cam position sensors are working to fire the plugs and should work the injectors. There is a light test unit which may be borrowed to insert in the injector harness to determine if each connector is firing.

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