1999 Chevy Suburban 1500 Not Starting – I Need Help

Chevy Models Forum
1

Hey y’all,

I’ve got a 1999 Chevy Suburban 1500 that’s been sitting idle for a year or two, and now I’m having trouble getting it to start. Here’s what I’ve checked so far:

  • Spark Plugs: They were burnt and smelled like gas.
  • Fuel Pressure: It’s steady when priming and trying to start the engine.
  • Starter Fluid: Tried using it, but the truck still doesn’t fully crank.

I’ve attached a video showing the truck trying to turn over and a picture of the spark plugs for reference.

Any thoughts on what might be causing this issue or what I should check next? I’m looking for any advice or troubleshooting tips to help get this truck running again. :blush:

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2

Use an inline spark tester to check if there is a spark reaching the plugs.

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3

Have you fully drained the old gas? It can go bad after about 6 months without a fuel stabilizer, and ethanol-mixed fuels deteriorate even faster.

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The likely reasons your Suburban isn’t starting are:

  • Fuel Delivery Issues: Check for a clogged fuel filter, faulty fuel pump, or injector problems.
  • Ignition System Problems: Possible issues with the ignition coil, distributor cap, rotor, or spark plugs (already replaced).
  • Compression Problems: A blown head gasket, worn valves, or other engine issues could be the cause.
  • Security System Malfunction: A faulty security system might be preventing the engine from starting.

Troubleshooting Steps:

  • Fuel Delivery: Check fuel pressure with a gauge or listen for the fuel pump when turning the key to “on.”
  • Ignition System: Verify spark at the plugs, and test the ignition coil and other components with a multimeter.
  • Compression: Use a compression tester to check engine compression.
  • Security System: Refer to the owner’s manual to reset the security system if applicable.