2004 Chevrolet Impala 3.4L, V6 hesitates

Posted by mellassi on January 15, 2014 under Imports | Be the First to Comment

customer complain:

Car bogs out when accelerating, idles fine, has misfire codes p0300.

diagnostics:

1-tested fuel pressure, added carburetor cleaner during acceleration, still bogs out.

2-disconnect MAF sensor,retest, runs better.

Possible causes:

.Faulty MAF sensor.

.vacuum leak after MAF sensor.

.MAF sensor power and ground.

fix:

replace new MAF sensor.