2003 Chevy Blazer Won't Start

2003 CHEVROLET BLAZER

14,700 MILES • 6 CYL • 2WD • AUTOMATIC

MDV2000

MEMBER
2 POSTS
FOLLOW

I have a Blazer with the 4.3L engine that won't crank at times. I have had the fuel pump tester, the fuel pressure regulator replaced and dealer diagnostic test it and they find nothing. I also recently had fuel filter changed.

I cannot find what it wrong, and computer doesn't code anything - yet it at times won't crank. I let it set for a day, it crank fine every time for a few days to a week and then does it again!

It is driving me crazy - any ideas?

Thanks,
Mike

Aug 27, 2008 at 7:08 PM

KHOOPER

MEMBER
22 POSTS

If you are experiencing that problem you mighy have a lack of fuel to the engine. In this case the engine will crank over and sound as if it wants to start. A quick test is to turn off all accessories, turn the key to on and listen for a low volume humming noise. This noise is the fuel pump. If there is no noise it is likely the engine is not getting fuel. A blown fuse, faulty relay, or bad fuel pump may be the cause.

Jan 29, 2021 at 11:22 AM

MDV2000

MEMBER
2 POSTS

Yeah, the fuel pump is running and I've had it tested twice by dealer mechanic - they can't find anything and don't have a clue to why it won't crank. I've been slowy replacing cheapest parts with a hope to finding the culprit. I think it has to be electrical, but don't know where else to look. Every time the dealer puts it to their computer to diagnose it, they come back with nothing.

I have had a service light for an O2 sensor - but they said that wouldn't stop it from cranking....

Maybe I need to fix that and see if its masking something else...

Thanks,

Jan 29, 2021 at 11:22 AM

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