1998 Chevy Malibu Engine misfires

1998 CHEVROLET MALIBU
Avatar
RHUTTSELL
  • MEMBER
  • 3 POSTS
Engine Performance problem
1998 Chevy Malibu 6 cyl Front Wheel Drive Automatic

My engine bucks whenever I "get on it". Replaced the spark plugs and wires. Could the cause be a fuel filter or any of the polution valves and stuff?
Sep 26, 2009 at 10:47 AM
Advertisement
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Check and test the following:

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
Sep 26, 2009 at 2:59 PM
Avatar
RHUTTSELL
  • MEMBER
  • 3 POSTS
Thank you SOOO much for other places to check this misfiring problem. Some of what you suggested I have done but you gave me some things to check. Thanks a lot!!

Rhuttsell
Sep 28, 2009 at 2:27 PM
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Make sure you check it step by step by the no.s if all else fails do an engine compression check both dry and wet-Good Luck
Sep 28, 2009 at 2:30 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.