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-   -   my mpg is lower than it supposed to be? (http://www.maxbimmer.com/forums/showthread.php?t=145693)

jasonbaek 09-13-2011 01:50 PM

my mpg is lower than it supposed to be?
 
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I managed to calculate my average fuel consumption over the last month..and it's not looking good fcplm

I averaged about 9.6km/ltr doing about 2/3 of downtown driving and 1/3 of highway driving.. I'm not a heavy footed either (rarely shifts at above 3.5k rpm) so I am quite surprised to the fact that I got so poor fuel mileage..considering it's got 1.6L m40 engine.

First reason that I can think of is that the car seems running slightly rich. I can smell gas (i think from exhaust) when it's idle. however there is no leak from anything and the smell goes away once I get it moving.

So my question is that, is it normal getting this kind of mileage? if not, what would be the problem?

T.Dot_E30 09-13-2011 01:53 PM

Sounds pretty decent considering it's alot of city driving.

Did you ever calculate it before? What were you getting then?

jasonbaek 09-13-2011 02:00 PM

I got this car last month so I can't really say about that.. I've seen people driving m42s getting 30 mpg easily .. as well as the gas smell from the car suggests that it's somehow wasting gasoline.

nonlocal 09-13-2011 03:08 PM

You might get slightly better mileage with some tuning but if you are expecting 30mpg doing 2/3 of your driving downtown... I am here to lower your expectations. 23mpg doesn't sound that far off.

jasonbaek 09-13-2011 07:11 PM

damn..I used to get 26~27 mpg in automatic mini cooper S (turbo one) with 100% city driving..(more traffic than toronto as well) I was expecting at least 27 mpg with this little e30. I also heard that m40 is supposed to get worse mileage than m42 because I have to push it hard in 1st and 2st year in order to keep up with the traffic..

mr ilia 04-12-2012 01:24 PM

You should be around 10L/100km in the city and about 8L/100km on the highway.
100% city will always suck on gas.

Deetow 04-13-2012 08:21 AM

I get exactly 9L/100K with my 1.8L M42. That's the same ratio of 2/3 city and I like to explore the full rev range of the car. =P
Most likely there's nothing catastrophically wrong with your car but it needs a good tune: Air filter, plugs, timing? etc.

jasonbaek 04-14-2012 12:07 AM

I'm actually getting more like 13L/100km when I calculated with trip meter..I'm gonna replace air filter and o2 censor..but I don't know which o2 censor should I buy for m40 yet.

BimmerBoys 04-14-2012 12:44 AM

Quote:

Originally Posted by jasonbaek (Post 1560125)
I'm actually getting more like 13L/100km when I calculated with trip meter..I'm gonna replace air filter and o2 censor..but I don't know which o2 censor should I buy for m40 yet.

this is probably what you need. 11781721125 looks like real OEM states 250$ but thats always overpriced for stuff like that.

jasonbaek 04-14-2012 04:00 AM

$250 for o2 censor? fcplm

BimmerBoys 04-14-2012 09:43 AM

try ebay.co.uk there might be a deal on there, also worldparts (i think) has them for about 120$ plus shipping. I called my supplier and my price it 198$ so ya... not cheap on this side of the pond

http://www.ebay.co.uk/itm/NGK-Lambda...item256cf28808

Beg the guy to ship to Canada, it usually works

mr ilia 04-14-2012 03:46 PM

You can use 3 or 4 wire generic O2 sensor from v8 Ford.
It is about 40.00 shipped from ebay. It is a direct fit, except you have to reuse the harness plug from your current motor.

MaxBell 04-14-2012 07:10 PM

Quote:

Originally Posted by mr ilia (Post 1560207)
You can use 3 or 4 wire generic O2 sensor from v8 Ford.
It is about 40.00 shipped from ebay. It is a direct fit, except you have to reuse the harness plug from your current motor.

Is this true? What V8 Fords? Mustangs, trucks?

mr ilia 04-14-2012 07:34 PM

I used some generic sensor, they are all the same, except the plug to the motor, it has to be type installed before catalytic.
Before you buy, you have to check the type of sensor you have on your car. It will either be 3 or 4 wire one...So when buying, you have to ensure you're also buying something with the exact number of wires....
The wire colors are 1 white, 1 black and 1 or 2 grey.

Installation goes as follows:
1) remove your original sensor
2) cut the connectors off both sensors
3) splice the wiring to the corresponding wire colour...greys are interchangeable
4) install new o2 sensor

Here is the link to something that will work, you just need to know the number of wire you have on your application:

http://www.ebay.ca/itm/PRE-CAT-POST-...ht_3926wt_1164

jasonbaek 04-15-2012 05:14 AM

Ok. I think using existing connector(splicing the wiring) would be easier for me because I have battery at front, which sits right on the top of electrical connector that o2 sensor plugs into.


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