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#1
05-05-2008, 10:43 PM
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97 MAP Sensor
Trying to get the old man's car fixed, and it is pulling code P107, MAP Sensor.
Can anyone tell me is this the sensor that is mounted on the intake/throttle body area? I could not see it that good as the lighting was poor. He is still getting good milage, and has been driving it this way awhile, so any harm in leaving it this way? Thanks for any feedback 
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#2
05-05-2008, 11:00 PM
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Re: 97 MAP Sensor
The MAP sensor is located at the right hand side of the upper intake manifold (plenum) opposite to the side with the throttle body. Underneath it is the PCV valve. Check the electrical connector to it and make sure it is properly mounted in that forked bracket. It has a seal so make sure that is good.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#4
05-07-2008, 12:14 AM
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Re: 97 MAP Sensor
Thanks guys, that clears it up for me.
Can anybody tell me how this might affect the performance of this car if the bad one is left in place? I can easy enough fix it but have to try and explain this to pops as to why it should be replaced 
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#5
05-07-2008, 08:52 AM
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Re: 97 MAP Sensor
You can operate with a flaky MAP sensor. All the PCM (computer) will do is see the lack of a proper output, set a respective DTC and use programmed default values. The MAP sensor responds to changes in intake manifold pressure which gives an indication of engine load. The manifold absolute pressure measurement is used to meter fuel. The PCM checks the MAP signal once the engine has been running for a length of time that is determined by the startup engine coolant temperature and throttle angle. Technically you could say every drive cycle. The time ranges from 2 minutes at less than -22 degrees F or to 1 second at more than + 86 degrees F. The MAP sensor signal is also used to test the EGR valve.
So the first step is to make sure engine vacuum is good which includes sealing where it mounts. Next you can check the PCM 5 volt reference signal at MAP input and then the output. MAP output signal varies from .1 volt low to 4 volts high. In most cases where a P0107 or P0108 DTC sets it is a bad MAP sensor.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#6
05-07-2008, 05:50 PM
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Re: 97 MAP Sensor
Thanks again, much appreciated.
This does clear it up for me.
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