MPG going down
#1
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2001 XKR with 23K miles--When I picked up the car last April I was averaging ~18mpg. I am averaging ~15mpg now. No difference in driving or performance. I know the plugs are original and I plan on changing them when the weather gets a little warmer.
Are the plugs the probable cause being 7 years old even though not much mileage on them?? Any other suggestions such as EFI adjustment
Gary
Are the plugs the probable cause being 7 years old even though not much mileage on them?? Any other suggestions such as EFI adjustment
Gary
#2
#3
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What kind of fuel are you feeding her? Race Track 89 Octane...or Exxon/Shell/Mobil 93? this made a huge difference in prior vehicles. Can you borrow a scanner with real time O2 sensor readings? That can tell you if you are running too rich...could be a sensor going bad.
#5
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well some good suggestions--I have been running plus (89 octane) performance has been fine. I have hecked the air filter--didn't seem clogged but I will change anyway. I have no access to scanner so maybe I will get the o2 sensor checked--would a bad O2 sensor give me some sort of error message or light
gary
gary
#7
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ORIGINAL: n17gary
well some good suggestions--I have been running plus (89 octane) performance has been fine. I have hecked the air filter--didn't seem clogged but I will change anyway. I have no access to scanner so maybe I will get the o2 sensor checked--would a bad O2 sensor give me some sort of error message or light
well some good suggestions--I have been running plus (89 octane) performance has been fine. I have hecked the air filter--didn't seem clogged but I will change anyway. I have no access to scanner so maybe I will get the o2 sensor checked--would a bad O2 sensor give me some sort of error message or light
As for the O2 sensor, I think it has to be constantly out of spec, and perhaps it isn't doing it enough for a MIL to appear, but a DTC code may have been thrown, won't know until you check w/ a scanner. A technician care to elaborate?
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#8
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O2 sensors will flag codes almost immediately due to emissions regs.
89 octane will definitly show loss of mileage. Spend the extra $3 per tank and you will see a noteable difference after a few fill ups. Also clean you injectors if you have been running cheaper gas through them for a while.
89 octane will definitly show loss of mileage. Spend the extra $3 per tank and you will see a noteable difference after a few fill ups. Also clean you injectors if you have been running cheaper gas through them for a while.
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