ScanXL readings, no o2 sensor, poor mileage - Page 2 -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > ScanXL readings, no o2 sensor, poor mileage

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Unread 11-22-2012, 09:12 PM   #16
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1997 ZJ 
Join Date: Jan 2011
Location: ottawa, ontario
Posts: 70
Originally Posted by ZeeJay1997 View Post
With switch on engine not running the kpa value should be somewhere near atmospheric pressure. At sea level and 32*C, the kpa should be 101.3. Mine usually reads 93-96, depending on the weather.

The 100 number in the formula you found is an assumed atmospheric.

A vacuum gauge is the best method to measure the intake vacuum.

Ok, I guess ill check the kpa value with the engine off.

I don't have a vacume gauge, but I'm not really looking for ultimate performance - just seeing if there's a significant issue.

seanom is offline   Reply With Quote Quick reply to this message

fuel economy , o2 sensors , zj

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