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  #11  
Old 05-03-2021, 11:15 PM
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+1 on the beer chug for sure.

I think I have a cat that's wearing out at 20 years and 196,000 not entirely surprised but I'll be adding some mini cat helpers to see if I can squeeze another couple years out of them (worked on wife's).

I'll also be replacing the surely originally MAF as soon as tax return hits the bank.
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  #12  
Old 05-04-2021, 10:05 AM
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something is wrong with the car, i reset the gas copnsumption odometer, drive a mile, just enough to have some numbers, and put it on park and it was going from 22L to 40L/100km, while on idle.. wtf ???? im gonna put some MAF cleaner , will comeback later to report
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  #13  
Old 05-04-2021, 10:17 AM
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Quote:
Originally Posted by Takimo View Post
something is wrong with the car, i reset the gas copnsumption odometer, drive a mile, just enough to have some numbers, and put it on park and it was going from 22L to 40L/100km, while on idle.. wtf ???? im gonna put some MAF cleaner , will comeback later to report

When you are idling you are burning gas without going anywhere. That is why your consumption is going up.





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Originally Posted by andrewwynn
Highest highway mpg in months and the error didn't come back yet.

You probably just got your first tank of summer gas. Depending on where you are at, it is probably about the time the summer gas shows up.
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  #14  
Old 05-04-2021, 11:24 AM
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after cleaning MAF and driving for a few miles, im doing 17L/100km(15MPG) which is about what it was when i purchase the car 6year ago.. but again im far away from the average for the x5 3.0 which its from my understanding around 18MPG or 13L/100km
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  #15  
Old 05-04-2021, 11:45 AM
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X5s aren't great on mileage in general. But yeah, @ 15MPG, you are sitting where my N62 4.8is lives for fuel economy. Somethings up unless you drive city traffic all day everyday, are stoplight racing, or drive up hill all the time.
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  #16  
Old 05-04-2021, 11:56 AM
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Even my six-cylinder car will only do about 16-17 mpg in my driving (which is mostly city and a lot of short trips). Your typical driving style and your commute (how fast you go, how aggressive you drive, how many times you stop and go) can certainly bring your mileage down to 13mpg with a six-cylinder. If you think you buy a car and you automatically "get" the rated mileage, you are going to find that you're very wrong. Your mileage will depend on how you drive and your particular commute, and remember that there's no limit to how bad your mileage can be, especially if you sit around idling it in the driveway (wasting gas without going anywhere). If you live in LA and you do the 0-90mph-0mph dash all day on your commute, you're going to waste a ton of gas. But if you drive 55mph on rural highways all the time, and learn how to coast to stops, brake less, and drive slower in general, you're going to easily exceed the ratings.

It's hard to make any judgment about whether your fuel economy is "right" unless you log your mileage for a few tanks anyways. This is why I always keep a fuel economy and maintenance log, so I can spot potential issues. For example, before I replaced my thermostat I was seeing 14mpg regularly in the wintertime, and afterwards I immediately saw about a 2mpg improvement.

https://www.fuelly.com/car/bmw/x5/2003/bdc/454415
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Old 05-04-2021, 01:14 PM
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fuel economy

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Originally Posted by Bdc101 View Post

You probably just got your first tank of summer gas. Depending on where you are at, it is probably about the time the summer gas shows up.

It is definitely possible. Chicago fill but also as I mentioned, ran injector cleaner and my consistent lean condition also went away, likely not just a coincidence.

My tip off was in addition to the lean fuel mix alert I got a misfire on one cylinder, which was what I had in spades when dealing with my wife's previous car, that problem completely vaporized with one treatment of injector cleaner.

So, I put in a bottle and half a tank of gas (to increase the concentration), and no errors since and coincidentally best mpg in months.
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  #18  
Old 05-04-2021, 03:19 PM
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Honestly you should just dump it into the tank when it's empty, the day before you fill up.



One of those cleaners maybe 8 or 12 ounces? And if you put a half a tank of gas on top (let's say diluted it in 12 gallons of gas) then you are diluting it to about 0.5% concentration.



When you take your car into the dealer and pay them for a "fuel injector cleaning" they will unplug your fuel pump and hook up a bottle of that same cleaner directly to the fuel rail, and let it idle on that instead of gas until it's gone. So it is OK to run at 100% concentration. And even then, it's difficult to identify the problem that it actually solves.
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Old 05-04-2021, 06:54 PM
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fuel economy

Not too difficult when you have misfire with fuel cutoff on 3-4 of 6 cylinders and after one bottle of injector cleaner they all go away.

In wife's case I was getting misfire on just one cylinder so I swapped a couple coils and the problem moved. I changed that coil and then got a misfire on a different cyl. Swap coils problem moves, change that coil. Happens a third time. Thats when I ran the cleaner.

I always put the cleaner in just before putting in 8-10g (not really half a tank). It seems to be concentrated enough. On more than one occasion I would get misfire on heavy throttle and the problem would go away on the first treatment.

I usually use Lucas but they happened to have STP brand and so far so good. No lean codes in about 90 miles of driving. I would usually get within five miles.

I still think my cat is nearing end of life or my MAF is overdue replacement so I won't be surprised to see the lean code return but the surprise was the cylinder misfire.

I also haven't change my fuel filter yet so even though they should last 1/4 mil miles or more when I changed wife's at 180 or so it was very very black on the dirty side of the paper. Not expensive enough to not change.

I don't use more concentrated on purpose I think time is an element of good cleaning and a couple hundred miles of driving with that 1/2% seems to do a good job and I've been using that method for 4-5 years.
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  #20  
Old 05-04-2021, 07:34 PM
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On more than one occasion I would get misfire on heavy throttle and the problem would go away on the first treatment.

On the flip side, one might also conclude that the cleaner hasn't solved any problems and you still have an intermittent misfire on heavy throttle.
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