Mechanics

NO POWER FROM DEAD STOP

1999 GMC Sierra

Engine Performance problem
1999 GMC Sierra V8 Two Wheel Drive Automatic 180000 miles

MY ENGINE SEEMS TO RUN FINE BUT WHEN YOUR AT A DEAD STOP AND GIVE IT WIDE OPEN THROTTLE THE ENGINE HAS NO POWER AND THEN STARTS TO CATCH UP. ENGINE USE TO SPIN THE TIRE FROM A DEAD STOP. 5.3 LITER
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Rayzor1
August 24, 2009.




Oxygen sensor
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

Tiny
Rasmataz
Aug 24, 2009.


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