1991 Chevy Lumina Not sure

1991 CHEVROLET LUMINA
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RACHELL
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  • 1 POST
Engine Mechanical problem
1991 Chevy Lumina Engine Size unknown Wheel Drive Type unknown Automatic 139000 miles
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I have replaced the MAP sensor, when it is plugged in and i start my car it raps out at 3,000 rpm even when its in gear. But if i unplug it we can get it to idle and drive at 1000 rpms. How can i find out what is making it do this? Could it possibly be the cams?
Mar 26, 2008 at 7:02 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Did you do any testing, before you replaced the map sensor? Any codes? Did you check the three wires going to the map sensor, ref voltage--ground--signal?

With the engine idling, is there any vacuum at the map sensor?
Mar 28, 2008 at 7:47 AM
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