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Old 05-24-2018, 07:33 PM   #1
azharj
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Lean Bank 1 and normal Bank 2 low MPG 9 in city

Hi. every one!
280 K windstar 2000, LTFT or Bank 1 remains 3 to 6. bank 2 remains -0.8 or 0.8. Remains same at high RPM 1500 But at 2500 rpm LTFT becomes normal near zero or 0.8 + -. Changed bank one upstreamO2 sensor no effect. No missing. Mode 6 shows no missing. Plugs and wires are 2000 KM. No CEL. No rough idling. No drive-ability problem. No oil leakage. no effect on spraying gas on engine. 9MPG in city and 14 on freeway. engine coolant and engine oil is not loosing. Regularly change engine oil and transmission oil.Any idea???

Last edited by azharj; 05-28-2018 at 10:27 AM.
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Old 06-01-2018, 05:58 PM   #2
tomj76
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Re: Lean Bank 1 and normal Bank 2 low MPG 9 in city

For the LTFT parameter, anything <25% or >-25% is OK (won't set a code). With numbers that with 5% of zero, I think you're engine is fine.

The imbalance can be caused by:
Leaking fuel injectors
Restricted fuel injectors
Leaking intake passages (vacuum leak)
Restricted intake passages
Incorrect oxygen sensor readings
Dirty valves
Worn valve train (particularly camshaft lobes)
Carbon building in combustion chambers
and more...
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Old 06-16-2018, 03:01 PM   #3
azharj
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Re: Lean Bank 1 and normal Bank 2 low MPG 9 in city

Thanks Tomj76. A few days ago, Keeping the reply by you, I took 4 bottles of Mitsubishi Injector Cleaner, poured in full tank and drove about 1000 miles on high highway in two days. I checked live data. Both banks same values for LTFT differing only by one or two. So I think off and on pouring Injector cleaner is a good idea.
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Old 07-23-2018, 12:17 PM   #4
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Re: Lean Bank 1 and normal Bank 2 low MPG 9 in city

That's good information to see that FI cleaner helped. Gasoline is supposed to include FI cleaning solutions, but it sounds like an occasional boost can improve them a bit.

The interesting thing here is that a single "shot" of gasoline from a FI is very small (~1/1000 fl oz), so the difference (5%) is just 1/20000 fl oz. I suppose this shows that it doesn't take much restriction in the FI to cause that error.
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Old 07-27-2018, 06:47 PM   #5
azharj
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Re: Lean Bank 1 and normal Bank 2 low MPG 9 in city

Tomj

Agreed may be only driving at highway speed had caused the change. There are many YouTube video to clean carbon and catalyst converter by pouring one gallon lacquer thinner in full tank of gas. Don't know the truth.
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