Significant reduction in mpg
Folks - I have noticed over the last 2-3 months that my 2001 325i is giving a much lower mpg than normal. During my regular commute I was able to get about 400-420 miles per tank, and am now getting 340-350 miles. Nothing has changed, same commute, traffic patterns, gas used, etc. I understand variations in driving conditions, but this seems like it happened overnight and never corrected. I am continuously getting 340-350 now. that is an approximately 15% delta and is big
Any theories on how and why this can happen?
Please let us know what is your
mileage on this car. Original owner? and what maintenance has been done on the emissions, air intake, MAS, O2 sensors, etc?
Which trans do you have?
Re: Please let us know what is your
90k miles, I am the original owner and hence can tell something aint right. Car gets routine annual maintanence as it always has. O2 sensors were replaced a while ago. There are no warning lights, etc.
I've heard of this, but is it really true?
I have owned this car for many summers and winters but have never experieced this. If this was normal, wouldn't we have huge swings in gas prices in the summer and winter?
What would you say is the max miles for
platinum plugs rated 100,000 miles?
I wouldn't run them past 60K...but that's just me
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& gas filter every 1 ...2 years or
every 15,000 miles
depending on your climate,
letting your tank stay between 1/2 and EMPTY all the time
instead of keeping it 3/4 to FULL all the time to
prevent moisture build-up
how much rain you let into the filler during fill-ups
quality of storage tanks in the ground at yer station -
you don't know - that's why you replace the filter
BEFORE your car stops!
No. Urband legend type thing that's been around
for years. I can assure you there's no truth to it.
I'm with you on everything but the plugs.
Some very valid points you raise.
But, every BMW wrench I've ever heard comment on the plugs (dealer and indy + my Chapter's tech reps) seem to agree that the plugs should be good for anywhere between 75k - 100k miles. I replaced my wives ('02 325) at around 86k, and they looked brand new.
I can understand someone wanting to err on the side of caution and maybe change them at 60k - 70k or so, but why would you posit changing them at 30K??? I get more miles out of a plug than that on my tractor. :) (j/k)
Seriously though, 30k is nothing short of throwing away perfectly good plugs in my opinion. (we're assuming of course that nothing mechanical has happened that may have foiled a plug).
No decent plug (i.e. a plug that would be recommendable for these cars), regardless of what part of the country the person is in, should be shot at 30k miles.
Agree--I would not wait for 100
I agree that waiting for 100 k is too long. The problem that I have encountered is sometimes the plugs are locked in place. I do them between 60 and 80 k.
One aspect of this kind of a check could be to
measure the fuel pressure with the engine off at the fuel rail Schraeder valve. Then let the car sit for hours and measure again to see if there is any bleed off.