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1990 Cadillac Fleetwood POOR EXCELARATION

Tiny
RAYHARTSR
  • MEMBER
  • 1990 CADILLAC FLEETWOOD
Engine Performance problem
1990 Cadillac Fleetwood V8 Front Wheel Drive 175000 miles

POOR EXCELARATION AND BACK FIRING WHEN I TRY TO GO UP A BRIDGE
Friday, July 17th, 2009 AT 9:54 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Oxygen sensor/s
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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Friday, July 17th, 2009 AT 10:00 PM

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