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Registered
Join Date: Oct 2006
Location: Canada
Posts: 12
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Poor fuel economy
Hello guys,
I have a 2002 E46 325it 5spd. (128,000km/80,000m) that I purchased in March of this year. I did a full tune-up (spark plugs, air filter, fuel filter, engine flush & oil/oil filter change, both belts, trany & diff. fluid and even fuel injector & valve cleaner) after I got the car. I only use 94 octane. Since then the gas mileage has gone down hill.  I am in Canada so I was averaging +/- 9.5L/100km & since the tune-up it has progressively gone up to 13L/100km? Any guidance in what could be causing this? or is it just a coincidence and something else is the issue? thanks in advance.Lukasz |
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10-29-2007, 12:33 PM
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O2 sensor? Plugged cats?
Does it seem to have full power or can you "feel" a restriction?
__________________
HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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10-29-2007, 12:50 PM
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Moderator
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Any excessive brake dust? Noise from the rear parking brakes?
__________________
HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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10-29-2007, 12:51 PM
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Registered
Join Date: Oct 2006
Location: Canada
Posts: 12
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The car seems to have full power with no restrictions.
There is no excessive brake dust on the brakes & no noise at all. Could the 02 sensors be gone with no engine fault code light on? Lukasz
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1995 318Ti 1993 Corrado VR6 |
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10-29-2007, 12:55 PM
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The O2 sensors usually throw CEL codes but I think it is possible for them to fail without throwing a code. That is to say thy can fail in more that one way. You should certainly research it further.
__________________
HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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10-29-2007, 06:22 PM
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1997 BMW M3 3.2L I6
