No start?

2003 CHEVROLET S-10
143,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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CRIMSON_DFECT0
  • MEMBER
  • 2 POSTS
Won't start. It would start and run until you put it in gear. Then it would stall out. Now it won't start at all. Have replaced fuel pump, fuel filter, MAF Everything I could think of. I don't know what to do. Can't afford to take it to a shop.
Sep 30, 2023 at 9:10 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

In most cases, a crank no start condition is caused by either a loss of fuel or ignition spark to the spark plugs. Let's try something so we can narrow down the cause.

See if the engine starts if you use starting fluid. If it does and then stalls, we know it is fuel related. If there is no change, I need you to check for spark at the plugs.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Also, here is a link you may find of interest.

https://www.2carpros.com/articles/car-not-running-advanced

Try this and let me know the results.

Take care,

joe
Oct 1, 2023 at 1:47 PM
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CRIMSON_DFECT0
  • MEMBER
  • 2 POSTS
Tried both. Would run rough for a second with starting fluid. There is spark at the plugs.
Oct 2, 2023 at 11:17 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Based on that information, it isn't getting fuel into the engine. You indicated the fuel pump was replaced. Have you confirmed the fuel pressure is within the manufacturer's specifications? Here is a link that explains in general how it is done. Also, I attached the manufacturer's pressure specifications below.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the fuel pressure is within the specifications provided, then we need to check if the injectors are getting power and ground.

Each injector has two wires. One will be a pink wire (at each injector) and the other will be different from one injector to the other. With the key on, there should be power to the pink wires. Check that for me first. If there is no power, check the ECM1 fuse in the under-hood fuse box. Check the fuse and confirm there is power to and from it.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Do this and let me know the results.

Take care,

Joe

See pics below.
Oct 2, 2023 at 1:07 PM
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