Question about 1988 Chevrolet C/K 3500

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It was runing good then just died will not start back up thought it might be fuel pump but not sure yet

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This will require a bit of testing. You will want to check for spark and fuel. Main things engine needs to run. A voltmeter and ohmmeter or get cheap multi-tester would be great. Test power to and from the fuel pump relay and to pump itself with voltmeter. You can test if relay is good with ohmmeter in ohm setting. You can test fuel pressure at fuel rail with pressure tester or with rag and press valve in to see if it sprays. You should hear pump run for few seconds when key is first turned to determine if pump is running.
Now test for spark. You can remove one spark plug and plug back in to plug wire, lay it on top of engine block so the bottom of plug is next to metal. Then have someone else crank over car and see if there is spark. Do this for each spark plug. Put other back in before removing another one. If all work, then good. If one is bad, it is probably bad plug wire. If two bad, it would be either plug wires, or coil pack or distributor cap depending on what you have. Bad rotor possibly if distributor. If no spark, could be bad coil pack module or crank shaft position sensor you can test with ohmmeter .

Posted on Oct 01, 2009

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I know in the mid 1970s Chevy had a modulator chip inside the distributor that would cause the same exact symptom they cost around $25 and can be found at your neighborhood autoparts store.
A quick check for spark will tell you if this might be the problem

Posted on Oct 01, 2009

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