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2000 Chevy Astro hesitation under load

Tiny
TUNES1561
  • MEMBER
  • 2000 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 196,322 MILES
My 2000 chevy astro has serious hesitation problems when accelerating. I'ts had a full tune-up with no improvemt. The scanner shows misfire on cylinder #4 @ idle and misfire on all cylinders @ load. I've replaced the coil, fuel pump, spider web injector system and have had a compression test with the results of 180 lbs. Of pressure per cylinder, the MAF sensor is working fine. What am I missing? HELP PLEASE. Thanks, Terri
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Tuesday, November 24th, 2009 AT 12:54 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Oxygen sensor
Catalytic converter
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Tuesday, November 24th, 2009 AT 2:14 AM

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