Fuel Trims
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Bob OB (12-15-2013)
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Bob OB (12-16-2013)
#4
Fuel trims
My 2000 XK8 hasn't been up on the back of a ramp truck in a few months, so I thought it might be time to start worrying about things... Actually, my highway fuel mileage ain't that great...maybe 22mpg@ 70, I'm easy on the throttle and brakes. Maybe my fuel consumption is where it should be? I'll study the fuel trim primer and see if I can better understand the system. Thanks to all who contributed... Bob
#5
A generic intro to modern engines is on several sites such as OnBoardDiagnostics.com - Engine Basics
The very brief answer is that the critical sensors let the PCM estimate the fuel based on air and then adjust based on O2 sensors. It's why ALL the critical things must work.
This stuff is essentially forced on all car makers by law. (USA, Europe & just about everywhere.)
The very brief answer is that the critical sensors let the PCM estimate the fuel based on air and then adjust based on O2 sensors. It's why ALL the critical things must work.
This stuff is essentially forced on all car makers by law. (USA, Europe & just about everywhere.)
Last edited by JagV8; 12-16-2013 at 05:04 AM.
The following users liked this post:
Bob OB (12-16-2013)
#6
I would not be concerned until the car starts acting up. However, if you want to see what is going on you could perform a MAFS test to see if the air and fuel are within a suitable range. It will not tell you what is wrong but could ease your mind.
Link JagRepair.com - Jaguar Repair Information Resource
Link JagRepair.com - Jaguar Repair Information Resource
The following users liked this post:
Bob OB (12-16-2013)
#7
My 2000 XK8 ... Actually, my highway fuel mileage ain't that great...maybe 22mpg@ 70, I'm easy on the throttle and brakes. Maybe my fuel consumption is where it should be? I'll study the fuel trim primer and see if I can better understand the system. Thanks to all who contributed... Bob
Mike
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