stumbles and stalls upon acceleration

2003 CHEVROLET BLAZER

120,000 MILES • 6 CYL • 4WD • AUTOMATIC

TCERVANTES

MEMBER
1 POST

My 2003 Chevy Blazer stumbles and stalls upon acceleration. We've had it diagnosed and it keeps telling us the Crankshaft sensor, Mass airflow sensor and Miss fire in area 4 is the problem. However, we have replaced both sensors, spark plugs and wires with no improvement. Please help!!

Jan 22, 2011 at 1:52 PM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

This could be a fuel related issue. If the engine is not getting sufficient amount of fuel during acceleration it could cause it to cut out.

This could be due to a faulty fuel pressure regulator or a clog in the fuel line or a dirty fuel filter.

Test fuel pressure to see if it has adequate amount. This vehicle should have 55-62 PSI of fuel pressure with the key on and engine off.

Here is a video on how to test fuel pressure:

https://youtu.be/aITQclp7zIE

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

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