Fuel Trim Wacky
#2
Noticing my mpg going down. Set the ultragauge to watch fuel trims.
At idle, engine warm, in park. This is what I saw; Video
At idle, engine warm, in park. This is what I saw; Video
for reference my 178,000 mile Disco 1 has LTFT of 0.8% that means it's less than 1% off the perfect air fuel ratio.
it looks like your right bank is adding fuel, either due to an air leak or bad O2 sensor.
Last edited by AbnMike; 09-08-2017 at 01:07 PM.
#4
#5
I had similar issues I've been chasing for awhile - very high LTFT. Kept being told it was a vacuum leak but I knew all my hoses and connections were good. Took it to a mech finally and paid the money for a smoke test - no issue. I replaced my 02 sensors and that did the trick.
Also a vacuum gauge will tell if there's a leak and a whole list of other things, too. Very good tool to have in your toolbox.
Quick Tech: How to Read a Vacuum Gauge to Pinpoint Engine Problems - OnAllCylinders
Also a vacuum gauge will tell if there's a leak and a whole list of other things, too. Very good tool to have in your toolbox.
Quick Tech: How to Read a Vacuum Gauge to Pinpoint Engine Problems - OnAllCylinders
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