Stumbles and stalls upon acceleration

Tiny
TCERVANTES
  • MEMBER
  • 2003 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
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!
Saturday, January 22nd, 2011 AT 9:52 PM

1 Reply

Tiny
SQM
  • 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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Monday, November 22nd, 2021 AT 3:00 PM

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