Common Causes of Poor Fuel Economy
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- čas přidán 25. 02. 2018
- I often receive the question "why is my BMW getting such bad fuel economy". This is a very difficult question to answer definitively as there are many things that can play into this. After eliminating driver error I list a few reasons here that could be a possible cause. The ones I listed are all fairly simple to DIY.
I did not list fuel filter and fuel pump in the video however they could be the source of a poor fuel economy problem depending on the model.
Tools and Products I use
Milwaukee Corded Impact Wrench 1/2 inch : amzn.to/2urnKWE
BMW Oil Filter Wrench: amzn.to/2N9lyJS
O2 sensor socket 7/8: amzn.to/2QZJHnl
Shell Rotella Oil 5w-40: amzn.to/2uy5RFR
Oil Filter (N52, N54, & N55): amzn.to/2FwBYI3
Oil Filter (N20, & N26): amzn.to/2tIkLIW
DeWalt Ratcheting Wrench Set: amzn.to/2FwBYI3
Pick Tool Set: amzn.to/303UAbP
E-Torx Set: amzn.to/35BGdws
Power Steering Fluid (E90): amzn.to/2yWyaea
Mann Cabin Filter: amzn.to/2hBqQxE
Chevron Techron: amzn.to/3r7ua5h
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I have an e60 with n52 and been having poor fuel economy, this one of the best lists to check!
Sport mode is why I get poor fuel economy
My car just recently started getting noticeably worse fuel economy than before so I’ll be trying these, thanks bro!
My 2004 BMW 325i only got 15 MPG since I bought it 5 years ago.
I cleaned the MASS AIRFLOW SENSOR and I'm getting around 30+ now!!!
(It never threw a fault code for anything. Including Oxygen Sensors.)
Sport mode + NYC traffic got me 10 mpg
That NYC traffic is no joke!
😭🤣
I got 2016 435ix GC M Performance Edition. I'm getting 15MPG on eco pro and comfort mode. I try my best driving efficient. What you think? OS this normal?
I have a 2007 E91 with Alpina suspension, drive it like a BMW should, I changed the fuel pump under the rear seats and the belt tensioner unit when the car was getting 12.3 mpg and 18.1 mpg city/highway. Now I get 19.3 and 25.7. Only use Shell Vpower in Cali.
Could be a vacuum issue, mine had an issue similar to that and ended up being the valvetronic shaft gasket. In your case, if you start hearing a whistling from your engine, high pitched then it’s for sure a vacuum problem. Could be a valve cover, could be the valvetronic shaft gasket, could also be the CCV valve. It’s that circular thing on top of the valve cover. When it happened to me I also didn’t throw codes and started right back up. Eventually did get a code for system too lean bank 1- vacuum leak.
Thanks I will definitely look into that!
No.9: Driving style - if you are not driving your BMW like it should be driven, you are not driving it right. Also, I once asked my brother about fuel economy on my previous performance car, and he said if you are worried about that, get another car. A BMW is a performance car and should be driven as such, you don't buy it to toddle around town. And you correctly point out you should use premium fuel - 93 MON / 98 RON, as I did run on a lower octane in my previous car and used way more fuel. The N52, especially the version in the 330i is a sophisticated 3-cam head, where it has been designed for performance versus economy as the engine was designed to go in the 630i coupe a much larger car and still perform well. I spend about NZ$100 per month on my car given I don't drive it much at the moment so that is how I measure my usage, not by how much I use, but by how much I spend and if I can afford it, then there is no problem. Linked video to my facebook page for my BMW 330i M-Sport - facebook.com/BMW330iMSport/
Thanks for the support! Yes driving style is a major factor.
BMW is performance car??? How much HP does other Cheap 3.0 L Japanese/Korean car produce?
@@sebastianasian lol, which Japanese or Korean 3.0l engine you on about?
O2 sensor my freind ;) bad sensore = bad gaz Economy
Thanks
On my 2011 e91 I'm getting consistent 17-18mpg on 91 octane in Southern CA (Mostly city driving). So I just upgraded to the Performance Intake, Euro Airbox, and Silicone Intake hose in hopes of getting a couple better mpg. Haven't noticed a dramatic improvement yet, but i'll try to report back if any of this makes any difference.
I remember when I first got my 2011 e90 328 I was getting no more than 14.9 mpg. Over the last year I’ve become more tame with my driving so I get high 16s low 17s
That problem started happening to me more and more recently and turned out to be crankshaft sensor
Check compression on high mileage vehicles periodically - it's the easy way to find out if it's time to start thinking about what to do next - (eg should I change my oil more often, ...to the final "time for a new engine or a new car!)
How do u check compression ?
Thanks
Z4, m54b25, no error codes at all, 14 us mpg in city and no more...But maybe the reason is i mostly drive with cold engine and short distances? Short i mean 3km(~2mile) mostly to the gym/work
Hey check your any codes referencing solenoids or cams. Might have to clean out solenoids or maybe fuel pump going bad
Ryan Thillman most of those codes will typically reference vanos solenoids.
I have a 2006 E90 with N52 motor. Until a year ago, it was getting about 25 mpg on mixed Highway and City driving. Since then, it's been dropping and is now only 20 mpg. Driving hasn't changed. Spark plugs, injectors, O2 sensors, coils, air filter, all OK. Mechanic is baffled. Any ideas?
That's odd have you tried to clean Vanos solenoids? They're quite easy to do yourself just make sure to no lose the O-ring. I have a video on how to do so as well. Other things would be to clean the MAF like really drench it maybe even soak it (only the end that reads not the plug end) just make sure you don't let it touch anything else as they're fragile and expensive.
czcams.com/video/oB2DIfBX8R8/video.html
Check compression
SPARK PLUGS! To answer your question about the stall.
ive reseted my onboard computer. did 10 km bearly touching pedal and i have 30.8 L per 100km
328i 2011 gm trans 130k miles. Have you ever had this jerkiness/ pull when you’re driving on real low rpms? If so can you please provide a solution to this
Had this problem recently and thought I'd changed plugs. Upon removing the plugs I noticed on of them was not burning like the others were. Check spark plugs and ignition coils for starters
Could also be torque converter shudder.
I need urgent help, I don’t know what to do anymore. I get around 4km per liter or 9mpg on my 2012 n55 e92. I don’t have good mechanics on my city so it’s hard for someone to know what’s wrong in my car. I need some recommendations. I’m about to clean the maf and o2 sensors and see what happens, everything else seems fine. Also I can smell gasoline from the engine bay but I see no leaks anywhere
I had a strong smell of gas when my injectors began to fail on my n54. I would also check your fuel rail, hpfp, and the fuel pressure sensor (I assume n55 has that).
I average 17mpg with mostly city driving with my n52 328xi. I wish I had more, but I accept that it's the price I pay for being so heavy on the gas so often
same
Me too
I just had issue with por idle. So I found that my coil pack o. Two banks went bad.changed it. An now I'm changing lanes
cold engine temp can also cause poor fuel economy. i mean thermostats that are stuck open causes engine to run cold basically on high speed like on highway. my bmw 320d e90 had both egr and main stats issue. coolant temp could hardly reach 60-65 on highway and mpg was like 7.8l/100km and even 8.1l/100km sometimes. so i replaced both stats and got coolant temp 86-88c which was enough to start dpf regen. drove on highway at 130km/h on 5th gear 3000 rpm for 45m. successfully dpf light gone, mpg to normal where it should be 5.5l/100km. Very satisfied with the work done by myself though it was not not that easy. so guys, if you have mpg problem or dpf if it is diesel dont forget to check coolant temp test. lots of videos out there on youtube on how to check coolant temp on bmw without coolant gauge. if your coolant temp below 80c then there is problem. so hope this helps. Cheers:)
My e91 lci 320xd gets 9.5 in the city and 7.5 highway :/ Should I look out for something?
I love my bimmer 2011 e90
I get 13mpg city but everything looks fine, idk why it’s so high: new maf, new coils, sparks, solenoids, fuel trims +-4%,
I just found a *fucked* DISA valve on my E90 (N52B25). No codes, no nothin'. It was ready to fall apart.
For some reason you don't get much warning of this other than physical symptoms (no power, bad fuel economy, the "death rattle" - if you can hear it), I suppose BMW thought sending an open loop servo control signal was good enough (servo motors have internal feedback loops) and saved a wire there instead of running feedback.
E90 335i N54, done walnut blasting, changed plugs, oil change done, but fuel consumption is bad. Car runs fine. I get about 17.3 mpg. Mixed driving. I expected terrible fuel consumption, but was hoping it would be near 20mpg. Always run it on Shell V power Nitro+ rated at 99 Ron in uk.
I get about the same as you I’d consider that pretty decent or average. It’s not an economy car after all.
I get around 16.4 mpg in my 128i but I drive it like I stole it lol.Do you have a source of info for the proper maintenance schedules on n52's? I wouldn't mind changing my o2 sensors since I'm nearing 60k miles soon
I’ll have to find it. But I do have it somewhere.
www.bimmerfest.com/forums/attachment.php?attachmentid=259787&d=1293391109
Would this be similar for a 330i?
Yes it’d be almost identical the only differences are you have a ZF transmission and you car comes stock with the 3 stage IM. Aside from a few other minor differences they’re essentially the same.
BMW-E90-HQ heck yeah thank you! It says I'm halfway there to replace my oxygen sensors.If I found some oem ones for a good price do you think if you were in my scenario would you replace them anyways.I feel the engine would be happier.
I have 14.5 mpg in city in my 2009 535i, and it's going lower! It might be even lower than that because it uses a quarter of a tank to drive 20,30 miles !! Anyone knows what's happening?
anoosh akhavan have fuel delivery checked, o2, spark plugs.
Worst case could be blowby at pistons or burned valves if performance is waining a bit as well. Check positive crank ventilation /induction system for signs of oily/sticky sludge on back of throttle plate for visual that exhaust and oil mist is being burned by the engine. Overfueling because injectors are too dirty or are not operating properly can ruin an engine in several thousand miles if in detected. You can sample the oil also - if it smells like gasoline, you have gasoline blowing by the piston rings and thinning the oil. Find the cause of the overfueling before continuing to drive at all. Change oil immediately if you have to drive even short distances to get it looked at.
Ok now im not so worried about my 29.7 mpg
i have a e46 m3 and ive been getting 11 miles per gallon. I have to try all of these. thanks
Wow that’s not good at all unless you’ve just got a lead foot. Hopefully you can get it squared away.
BMW-E90-HQ haha I don’t. I always drive under 3,000 rpm. Every once and a while a small pull but that’s it
Yo what’s that beat called in your intro
Iced by Fleslit I found it from free music archive.
My cold start sort of stutters, it sounds like someone tapping a microphone every 2 seconds
I changed my fuel filter today, my mpg sky rocketed😊⛽
Whats ur avg mpg?
we still wating your answer
Still waiting
still waiting
Yep…….still waiting
lmao I'm getting 33l/100km or about 7mpg on my late dad's 2004 X5 E53 3.0i (worse than a bugatti chiron i guess), got too much problems on this car, car won't even go until i press the gas pedal halfway through.
I don't know what I should change to have a better fuel economy, it could be spark plugs, or dirty maf sensor, or air filter, or fuel filter, lmao I have no idea what to do.
I own a BMW E60 N62 V8 ENGINE, 10MPG. its my hope to get more mpg.
No video ever says what their gas milage is! What are you getting on you 2006 325i
15 miles per gallon
I get 28.5 m.p.g. in my 06 325i, and 25 in my 05 325i. 06 is 6 speed auto, 05 is 5 speed manual with headers and muffler delete.
What was the fix for p1093 most common 04 xi
fix is normally new blinker fluid but sometimes, rarely, the fix is new exhaust bearings.
How can i tell if i have a msport , or just false stickers and badgers .
You would have different bumpers front and back.
This is my 1st bmw
Had for 2month's replaced valve gasket $826. Already. Im in nz and its a japan car so i didnt get any info , manuals ,old service accounts . Struggling to trust it to go on a trip .
In nz right now is $2.48 litre thats for 91 unleaded
I have a 2006 bmw 330i buring fuel within a day to or two and sing of overheat even with the anti freeze full to the max
The instrument cluster tells me I’m getting 17-18.4 mpg with city driving in LA, but yet the miles to empty drops quick, any suggestions??
Same here.
Same ! I really fill up at the 3rd day. And Mostly Highway driving
Would this also help with my 550?
Yes, good list of poor fuel economy fixes for any BMW
nope, doesn't work on 550's, works on all internal combustion engines except 550's. Sorry.
i get like 10.5 mpg in my 2008 335xi just driving around normally. i'm gonna try to replace the filter and plugs and hopefully i get little better fuel economy.
Did it work
LMAO WTF I changed mine and defitneky noticed better throttle which goes over to mpg
I get 9.5 in my 09 335i lol
Tuned
I’m getting roughly 21 MPG average.. probably 70% Highway and everything is up to snuff on my N52 E90.. and I hardly use DS mode. .the only thing that I think could be a factor of about 2 mpg would be my Thule roof bars with faring.. what’s your average mpg on the BC display?
It’s at 22.8 my tune most likely explains the difference. Since I’m probably at 60-70% highway with spirited driving.
BMW-E90-HQ that makes sense. In my case.. mines an XI so I have that against me aswell.
My miles went from 180 mls to 130 mls and I only traveled 5 miles anybody know the issue
I'm getting 20mpg in provincial New Zealand???
I’m not sure what that means as far as driving conditions. But 20 mpg sounds fairly average.
As a petroleum engineer i can tell you that crappy gas stations have the same fuel and any other gas station in your area cause all these gas stations get their fuel from the same place lmao so if you find somewhere that sells it cheap just get it from them it’s the same damn gas as mobil
There no difference? What's all this nonsense about performance fuels then?
@@Psalm_23 marketing guff for the sheep
My BMW 328xi 2010 makes 15 miles per gallon on highway and city 9.0 miles 😥😥😥
Daaannnnggggg. Lead foot?
Same thing si happen with my car did you find the problem..¿
🤣🤣🤣🤣
Shit, your wallet crying.
In Cali only 91 octane,I can't find more then it,l.a traffic is brutal I get 16/18 mpg if I drive my way 8/10 mpg,it's a BMW no a Fiat...lol
Only in Italy /Europe they have 93/95/98 octane,I don't think I ever seen in U.S
gianluca di medio Yes Europe measures their fuel differently. We have 93 in North Carolina. In the US we us AKI (anti knock index) also called RON. In other countries they use MON (minimum octane number)
Come to upstate NY! 93 octane at 9/10 gas stations
I been getting codes po171 and po174 I check for vacuums leaks , Nd nothing. I erase the codes they still come back I replace mad sensor and new valve cover with gaskets . Any other ideals ?
Vacuum leaks can be difficult to track down sometimes. How have you checked? I usually use carb cleaner and spray it around the engine bay until I find a spot where it acts up. If that doesn’t work I’d suggest having a shop smoke test it.
BMW-E90-HQ they already did a smoke test on it it was the valve cover of the motor and the mAf sensor . But the codes return
Daniel Fonseca That’s odd could you possibly have a bad fuse? That’d be my first guess.
BMW-E90-HQ what fuse could of be
Daniel Fonseca Honestly I don’t know just whichever fuse controls the sensor in question. I’ve never experienced this problem so I don’t really know.
Tank run? What is that?
Tech run? Techron?
Techron Chevron, its a fuel treatment that cleans out your fuel system.
18.2 liter per 100km for my E90 2011 LCI bruh! Idk what to do
mine is 15.5 liter per 100km E90 2007
Get it diagnosed, mine 2010 325 I get 8.7 liters per 100km
I only have 91 here in Cali 👎
I know, it's unfortunate.
7.5 liters per 100km on highway... 13L flooring in city... Want less? Buy diesel. Or install LPG
Some of my family lives in Australia and when we talk about cars its always fun trying to convert liters per 100km to MPG. That actually really good fuel economy especially considering hard driving. According to google I do about 11.2 liters per 100km combined.
That cat scared the shit out of me
My 1998 e38 straight piped is doing 8.9mpg in the city smh.....
Lol v8?
BMW-E90-HQ yessir and she’s 2 tons in weight so gas consumption is taking its toll on my wallet
Im goin to try some of these tips n hopefully i get some better mpg
I like your kitty.
Have you guys seen the way 99% of BMW owners drive? Should be looking at less than 15 MPG.
Lmao true
Sound like your Crankshaft sensor going bad
Eddie Angel he would have huge oil leaks if that was the case
@@flying541 ...not oil leak outside engine... means oil going inside the sensor and making no signal.
I had terrible fuel economy until I discovered this one brilliant trick, urination. I urinate in this special jug called the "piss jug" and then pour it in to the fuel tank. Works wonders, been doing this for years, and my father did too, its a family tradition one could say. Urination, its God's own source of nutrients and wholesome well being.