My engine won't start up why?

DRJIMCHIRO

MEMBER
2010 CHEVROLET BLAZER

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?

3 Replies

GARFIELD

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.

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Monday, February 12th, 2007 AT 5:52 AM

C1971

MEMBER
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

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Thursday, February 22nd, 2007 AT 4:19 PM

KASEKENNY

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

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Friday, January 29th, 2021 AT 2:03 PM