LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Map sensor volts and spark advance readings

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Old Aug 22, 2003 | 06:16 PM
  #1  
$hawn's Avatar
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From: Wichita, Kansas
Map sensor volts and spark advance readings

What are the map sensor volts supposed to be before starting and idle, mine are 4.66 before I start the car, and at idle it's 1.05-1.07. Spark advance is 2* before start, and at idle it's bounces between 23-25*. Also the IAC count when warm is 97 before the engine is started. Actually all these reading are when the engine is warm, do they sound kosher to you guys? Thanks
Old Aug 22, 2003 | 07:45 PM
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Sounds pretty normal. You might want to read Fred's blurb on scanner readings.
Old Aug 22, 2003 | 09:10 PM
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Yeah, I'v read Fred's scanner readings page, some of those it didnt really go into detail all the way, like with the 2* with the key in the on position, and the iac at 97 counts I was sure about either, everything else seems good.
Old Aug 22, 2003 | 09:32 PM
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Some things are not really significant when the engine is not running.
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