1997 Chevrolet Blazer No Start

2010 CHEVROLET BLAZER
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DRJIMCHIRO
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  • 1 POST
I bought a used 1997 S-10 blazer with the 4.3L and 124,000 miles. It ran well for the first few miles and then began to die intermittently. After a few seconds, sometimes a minute or two, it would restart. It always turns over, but now doesn't start at all. The instrument panel lights always go out when it dies, and I've noticed that when the instrument lights come on, it'll start right up. Now, they've seem to go out for good and I'm stuck. Is this indicative of a ECM failure? Where is the ECM located?
Feb 11, 2007 at 1:56 PM
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GARFIELD
  • ✓Experienced Mechanic
  • 197 POSTS
This sounds like a fuel pump or the crankshaft angle sensor has gone out. When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.
Feb 11, 2007 at 9:52 PM
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C1971
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  • 4 POSTS
A buddy of mine has a s-10. The truck developed the same problem as yours. It took awhile to figure out but it was the crank sensor that was bad. Hope this helps
Feb 22, 2007 at 8:19 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
They are probably correct that the o2 sensor issue will not cause a no start as the o2 sensors are not used until the engine is warm.

Even though you can hear the pump doesn't mean it is working. Here is a guide that will help with this issue:

https://youtu.be/dCjmRL3p4Cs

I would suggest also to test the fuel pressure just to make sure it is correct. Here is a guide that will help with this:

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

Let's run through this and see what turns up. Thanks
Jan 29, 2021 at 6:03 AM

Suggested Repair

Check whether the fuel pump primes with the key on and test fuel pressure. Also test the crankshaft position sensor, which fixed a similar S-10. Do not assume the ECM has failed until power, fuel delivery, and the crank sensor are checked.

Conversation Summary

The owner of a 1997 Chevrolet S-10 Blazer 4.3L says it stalled intermittently and now cranks but will not start. The instrument lights go out when it dies and stay off during the no-start. Experts recommend checking fuel-pump prime and fuel pressure and testing the crankshaft position sensor. One reply notes an oxygen sensor would not cause this no-start.

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