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1991 Chevy Lumina Not sure

Tiny
RACHELL
  • MEMBER
  • 1991 CHEVROLET LUMINA
Engine Mechanical problem
1991 Chevy Lumina Engine Size unknown Wheel Drive Type unknown Automatic 139000 miles

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?
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Wednesday, March 26th, 2008 AT 2:02 PM

1 Reply

Tiny
JDL
  • 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?
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Friday, March 28th, 2008 AT 2:47 PM

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