1999 Oldsmobile Alero engine turns over but wont start

1999 OLDSMOBILE ALERO
99,563 MILES • 4 CYL • FWD • AUTOMATIC
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SCOOTER76
  • MEMBER
  • 1 POST
the car was running rough and gave a trouble code that i looked up and was a random misfire.I replaced the plugs and wires(boots if u will)to no avail. I then tested the coil packs, crankshaft sensor, and those test out as working. I dont know where to go next.Thank you for your help.
Feb 14, 2009 at 2:53 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Engine misfiing can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Feb 14, 2009 at 4:11 AM
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