Is there any way to get Manifold pressure reading in and OBD 2 auto? - Fuelly Forums

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Old 01-29-2010, 02:54 AM   #1
eee
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Question Is there any way to get Manifold pressure reading in and OBD 2 auto?

Is there any way to get Manifold pressure reading in and OBD 2 auto? perhaps directly from an already existing sensor? or perhaps by installing and aftermarket gauge? What's the quickest cheapest way to make or install a gauge yourself? my car is a 95 scoobie with obd 2.
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Old 01-29-2010, 04:10 AM   #2
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Intake manifold or exhaust manifold??

If intake, a simple vacuum gauge will do wonders, just t-off any existing vacuum line. These gauges are like $15 at most places. It'll show vac and pressure

Google search for "vacuum gauge"
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Old 01-30-2010, 06:11 PM   #3
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well if the car comes with a map sensor, then a scan gauge should be able to pick up on that.
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Old 02-28-2010, 03:35 PM   #4
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well, so, i found that the legacy has a vacuum sensor mounted by the wheel column, but having poked under the hood for quite some time it seems not so for the impreza 1.8L engine. it must be mounted somewhere else. following the tubing from the manifold, i think i found one 2 wire sensor, but couldn't read any voltage off that; i believe that was the knock sensor. the vacuum sensor must be better hidden somewhere on the impreza; anyone found it on this car?
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Old 02-28-2010, 08:06 PM   #5
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Quote:
Originally Posted by eee View Post
well, so, i found that the legacy has a vacuum sensor mounted by the wheel column, but having poked under the hood for quite some time it seems not so for the impreza 1.8L engine. it must be mounted somewhere else. following the tubing from the manifold, i think i found one 2 wire sensor, but couldn't read any voltage off that; i believe that was the knock sensor. the vacuum sensor must be better hidden somewhere on the impreza; anyone found it on this car?
This may help...http://www.fixya.com/cars/t3140741-map_sensor
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