pressure gauge with engine off reading? -
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Unread 12-10-2014, 10:14 AM   #1
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Join Date: Dec 2005
Posts: 335
pressure gauge with engine off reading?

I recently had my pressure sending unit go bad. Replaced the unit with a NAPA unit less than a month ago. Pressure read great til recently. Now it reads like 21PSI regardless if engine is running or if the key is just turned over. Should the gauge read 0 with the turned over but engine off?

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Unread 12-10-2014, 10:19 AM   #2
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Join Date: Jun 2011
Location: Towson, Maryland
Posts: 1,801
All electronic engine management sensors should be replaced with OEM Mopar sensors. Chrysler vehicles are very picky about them and after having numerous failures of aftermarket sensors right out of the box I just run OEM for electronics no matter the vehicle.

When I bought my Jeep the oil pressure would read at about half (40) with the key on engine off (KOEO). With key on engine running (KOER) it would peg at 80. Replaced sensor and its read normal for the last 4 years.
Bear - 1999 Jeep Grand Cherokee Laredo - 250,000 Miles, BDS 2" lift, Overland rock rails, Dynomax cat back exhaust, 245/75/16 Kumho KL78's, Rebuilt 4.0 @ 244,000 miles.
Apollo - 2008 Mazdaspeed3 - Mazdaspeed CAI, Mazdaspeed CBE, Prosport boost gauge.
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