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Had a scan session and now i have a question

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Old Aug 17, 2003 | 10:54 PM
  #1  
Chris Etemadi's Avatar
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From: Dallas, Texas
Car: 1991 Z28
Engine: 5.3 Gen III SBC
Transmission: 4L80E NTC 258mm Stall
Axle/Gears: Trick Chassis 9" 3.50 S-Strac
Had a scan session and now i have a question

I just noticed something while looking over my scan data The Map Volts will not go over 4.67 volts at WOT and even with the car not running the volts stay at 4.67. I was wondering If this could have any affect on performance. I would assume that under WOT I should be getting 5 Volts to the Map sensor. I think I could have possibly made a bad connection while extending the wires to the map. What would getting 4.67 volts instead of 5 volts do to performance?
Thanks in advance for the help
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Old Aug 17, 2003 | 11:24 PM
  #2  
funstick's Avatar
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From: great lakes
whats the barometer or elevation your at
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Old Aug 18, 2003 | 09:14 AM
  #3  
Grumpy's Avatar
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Joined: Jun 2000
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Re: Had a scan session and now i have a question

Originally posted by Chris Etemadi
I just noticed something while looking over my scan data The Map Volts will not go over 4.67 volts at WOT and even with the car not running the volts stay at 4.67. I was wondering If this could have any affect on performance. I would assume that under WOT I should be getting 5 Volts to the Map sensor. I think I could have possibly made a bad connection while extending the wires to the map. What would getting 4.67 volts instead of 5 volts do to performance?
Thanks in advance for the help
What is it with the key on, engine not running?.
5v at the input will probably get you a MAP voltage too high error code.

For the exact answers, would mean reading thru a commented hac of the code your running, and seeing how baro readings come into play with things.

And it takes a pretty stout motor to get to true baro, ie about 100 K/Pa, MAP readings.
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Old Aug 18, 2003 | 05:40 PM
  #4  
Chris Etemadi's Avatar
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Senior Member
 
Joined: Oct 1999
Posts: 548
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From: Dallas, Texas
Car: 1991 Z28
Engine: 5.3 Gen III SBC
Transmission: 4L80E NTC 258mm Stall
Axle/Gears: Trick Chassis 9" 3.50 S-Strac
with the key on i get 4.67 volts and at WOT i get normally about 4.63 sometimes it spikes to 4.67 im not sure of my elevation but im in OKC so prolly 1500 feet above sea level
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