BMW E34 535i fuel efficiency??? - BMW Forum - BimmerWerkz.com
BMW Forum BMW Forum

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)
Register Home Forum Active Topics Gallery / Showroom Auto Loans Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

BimmerWerkz.com is the premier BMW Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 10-25-2010, 07:35 PM   #1 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Smile BMW E34 535i fuel efficiency???

Hi guys,

Recently brought a 1992 BMW E34 535i. Absolutely love everything about the car except at the moment the fuel efficiency is through the roof. It's averaging around 21.0L /100kms which is just disgraceful. That's taking it easy by the way. Was wondering what anyone's opinions on this might be, I was thinking it might be the Oxygen sensor, because apart from that the car runs pretty smooth but not too sure.

What sort of average should I be getting??


Thanks in advance
aliasneo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-25-2010, 08:17 PM   #2 (permalink)
OMFG another one!?
 
witeshark's Avatar
 
Join Date: Aug 2004
Location: Miami FL
Car: 89 E30 325i, 2007 Honda
Posts: 14,690
Photos:
witeshark is just really nicewiteshark is just really nicewiteshark is just really nicewiteshark is just really nicewiteshark is just really nice
You're right, that's not good economy, about 11 mpg. It should be more like 16 in mixed driving. Up to 22 in good highway conditions.
__________________
BMW

Sig by zeaq
witeshark is offline   Reply With Quote
Old 10-25-2010, 08:42 PM   #3 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Yeah, really not sure what it might be, just wondering if anyone else has encountered the same issues.
aliasneo is offline   Reply With Quote
Old 10-25-2010, 11:09 PM   #4 (permalink)
Millions of them.
 
Torque's Avatar
 
Join Date: Dec 2003
Location: USA
Car: e36 w/ a m42
Posts: 14,878
Photos:
Torque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond reputeTorque has a reputation beyond repute
They're not great on gas no matter what you do ... as shark said, you'll still struggle to get in the 20s ... I've had multiples, they were all like that. As for your 21 liters ... try doing a simple tuneup (you know, the regular: plugs, filters, oxygen sensor) and see where that gets you.

btw, you getting the number from the OBC or are you actually calculating it yourself?
__________________
Torque is offline   Reply With Quote
Old 10-28-2010, 02:52 PM   #5 (permalink)
n00b
 
Join Date: Oct 2010
Car:
Posts: 1
Photos:
tour96se is on a distinguished road
get a 525 if you want good mileage! my little trip computer says i'm getting 28.6mpg on the highway. i would try o2 sensors,plugs,wires,fuel filter,pump,intake boot,air filter..basically a good tuneup. how's the timing? tire pressure? any of the calipars hanging?
tour96se is offline   Reply With Quote
Old 10-28-2010, 06:27 PM   #6 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Hey guys, yes these figures are coming from the OBC dash. I'm now getting between 16 & 18 litres/100km's which makes me believe it just has to be the oxygen sensor. Tested out my wires & replaced the spark plugs but yeah It's definitely the O2 I believe. All the timing is going perfectly fine, just basically the fuel is running way too rich.

I love the 525's but got the 535 so I'll stick with it. Still absolutely loving BMW's apart from this, it's my first Beemer and apart from the fuel efficiency It's just an awesome cruiser.

Anyone know where I can get an O2 sensor for a reasonable price, down here in Australia for the Bosch equivalent for my model, I was quoted at $180 AUD so wondering if there is a place where I can purchase one cheaper if anyone knows???
aliasneo is offline   Reply With Quote
Old 10-28-2010, 08:42 PM   #7 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Ok, I just went ahead and purchased the bosch o2 oxygen sensor. The cheapest I could find it for myself delivered was $107 AUD which isn't too bad I didn't think

Will install when I get it and see if there are any noticeable differences.
aliasneo is offline   Reply With Quote
Old 10-28-2010, 08:55 PM   #8 (permalink)
OMFG another one!?
 
witeshark's Avatar
 
Join Date: Aug 2004
Location: Miami FL
Car: 89 E30 325i, 2007 Honda
Posts: 14,690
Photos:
witeshark is just really nicewiteshark is just really nicewiteshark is just really nicewiteshark is just really nicewiteshark is just really nice
Best of luck then!
__________________
BMW

Sig by zeaq
witeshark is offline   Reply With Quote
Old 10-31-2010, 09:15 PM   #9 (permalink)
Neutral Member
 
Join Date: Aug 2010
Location: LAX, CA
Car: 1986 528e Auto,
Posts: 71
Photos:
gidgaf is on a distinguished road
AFAIK the biggest factor is that thing on the end of your right leg. My wife consistently gets over 10% better mpg than I do. If you're braking a lot, you're gassing a lot. Plus it's city driving- we were bothered by our 16 mpg also, until the OBC told us our average speed never went over 23.5 mph. Half the drive time is stopped at the light; the other half is going up to 45, cruise at 45, then stopping.
You can always check out the hypermilers for techniques. some of those guys are pretty serious.
gidgaf is offline   Reply With Quote
Old 11-06-2010, 04:32 PM   #10 (permalink)
1st Gear Member
 
1LOBOSS's Avatar
 
Join Date: Sep 2007
Car:
Posts: 156
Photos:
1LOBOSS will become famous soon enough1LOBOSS will become famous soon enough
Damn and I thought my Ram Hemi 4x4 was bad at 15-16L/100k in the city and it's a 5.7L@390hp-407Tq. Good luck with the fix
__________________
I am a jolly green giant in the land of little people
1LOBOSS is offline   Reply With Quote
Old 11-10-2010, 10:28 PM   #11 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Okay guy's got the part in today, finally, USPS took their time. I got the Bosh premium oxygen sensor & all up including delivery I paid $107 AUD which isn't bad considering they are going for $180 AUD at trade price. Really starting to love this car even more each and every single day. Will install the o2 sensor tomorrow when my car's cooled down etc & will keep you all posted.


Another thing about me being a little heavy on the pedal, my girlfriend drove my car and got it down to 19L/100km so I'm sure I've contributed slightly haha!

Cheers guys
aliasneo is offline   Reply With Quote
Old 08-30-2011, 07:46 AM   #12 (permalink)
n00b
 
Join Date: Aug 2011
Location: sydney
Car: 89 E34 535i manual
Posts: 2
Photos:
grey5351 is on a distinguished road
Man I could be posting the exact same posts as you right now eg just bought my first beemmer , 89 535i manual, lovin it more each day & the most concerning right now the fuel consumption. I'm getting bout 18-19liters/100km whilst trying to drive conservatively. I've changed the oil/filter air filter fuel filter spark plugs dizzy cap & rotor & was now thinking o2 sensor. How did you go with the replacement of your o2 ? Did it improve fuel economy at all ?
grey5351 is offline   Reply With Quote
Old 08-30-2011, 08:09 AM   #13 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Hey mate I ordered the o2 sensor from ebay, it was a bosch It was a little challenging but eventually got in there and got it loose. I actually no longer have the BMW, my girlfriend hit me from behind and even though the boot was slightly pushed in, the insurance company classified it as a ride of and I brought a Toyota Soarer (Lexus SC 300) instead. It's pushing out 260rwks and if I give it a boot full still uses less fuel than the Bimmer does about 17L to 100KMs and if I drive it normally only ever overtaking now and then I get 13L to 100KMS. A part of me misses this car for comfort and the massive sun roof but with fuel prices and the fact that I have a faster car with similar features to the BMW I'm glad my girlfriend hit me.
aliasneo is offline   Reply With Quote
Old 08-31-2011, 06:19 AM   #14 (permalink)
n00b
 
Join Date: Aug 2011
Location: sydney
Car: 89 E34 535i manual
Posts: 2
Photos:
grey5351 is on a distinguished road
Well first of all sucks arse about the stack with the misses but nice choice on the replacement. Boost is fun & very addictive & local performance parts availability is awesome. Did you ever get to fit the o2 sensor before the prang & if so did you notice any difference in fuel economy ? just asking as my symptoms or lack of sound similar to yours , my car drives fine doesn't hesitate when accelerating & doesnt blow any smoke. My car is returning bout the 20 l per 100km , I just can't fathom this 3.5l 6 would chew 20l /100km being driven just as you described. going to do a diagnostics check with a scope on the weekend but was just curious how you went .
grey5351 is offline   Reply With Quote
Old 08-31-2011, 10:15 AM   #15 (permalink)
n00b
 
Join Date: Oct 2010
Car: 1992/E34/535i
Posts: 8
Photos:
aliasneo is on a distinguished road
Yeah I did fit it and had it working a couple of months before the prang! I did notice the difference slightly but overall it still drinks and I came to accept that for a 1992 535i it was normal to expect higher than usual fuel usage when I took into consideration it's age and the fact that it was made during a time when Petrol prices were nothing to really worry about. I would assume that the higher than average fuel mileage came from a combination of more than just the o2 sensor but it was a good starting point and if I still had her which at times I wish (not really haha but I had a soft spot) I would just slowly go through the list. Amazing cars for cruising, loved every moment of it!
aliasneo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
BMW E34 Fuel gauge slow :( Mamij 5-Series (E12,E28, E34, E39, E60) 11 01-30-2011 02:10 PM
91 535i fuel pump problem Panel Beater 5-Series (E12,E28, E34, E39, E60) 5 04-19-2010 10:08 PM
92 535i e34 CAMO_92_535i 5-Series (E12,E28, E34, E39, E60) 2 10-01-2009 10:28 AM
e28 535i fuel no spark JUSTIN P 5-Series (E12,E28, E34, E39, E60) 0 03-08-2009 05:00 PM
e34 BMW 535i Sport Leicesterboy15 5-Series (E12,E28, E34, E39, E60) 0 01-16-2004 12:36 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 04:18 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.