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      10-15-2014, 02:37 PM   #1
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335d poor MPG

Hey guys had a search but cant find anything, basically my car has decided it wants to become a alcoholic a drink like mad, i fill my car up every other week £70 and reset the computer each time and recently I've noticed at time of refill my MPG has been very low.

Yes i drive my car very hard and always have done but my average MPG has gone from 29-33 to 17-20 nearly as bad as my old 500hp Impreza STI 13 Mpg aha

I've plugged it into the diagnostic machine and it came up with a few

fuel filter

ABS/DSC/BRAKE section

Pressure Sensor on front left / Exhaust VL / Coil TC (supply 2) open/ Outlet Valve code - 005D9D

Hydraulic front or rear axle leak/ Drivers TC shorted (ISO 2)/ Outlet Valve/ Exhaust Valve VR

No idea what any of that means, wont have anything to do with MPG though

i did have everything light up like a xmas tree DSC Failure/ ABS Failure/ Tyre Pressure Monitor Failure, Hill Start Assistant Inactive

i put that down to unsettling the car taking a corner way to quick for what the car felt comfortable with having DSC Off

Any Advice will be great

Dan
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      10-16-2014, 06:49 AM   #2
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check your coolant temps through hidden menu to see if egr and main stat are operating at correct temp - drop in temps now (colder mornings) will have a big affect on fuel consumption if stat not working as engine will still be in warm up mode
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      10-16-2014, 07:24 AM   #3
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what mistryn said, low mpg, first thing to check is coolant temp, anything less than 90 deg could signal issues with the stats. should only take 15mins for the car to warm up.
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      10-16-2014, 09:44 AM   #4
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obvious one would be the fuel filter, if its clogged excessively you will use more fuel.

The other ones are strange, as they are realting to exhaust valves/coils and axel hydraulic leaks?. If it is valves/coil faults, again could cause more fuel consumption.

you could do with a BMW specfic code reader, DIS or the BMW app for the phone
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      10-16-2014, 10:05 AM   #5
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Quote:
Originally Posted by PAULDON View Post
obvious one would be the fuel filter, if its clogged excessively you will use more fuel
can you explain your thoughts on this please - surely a blocked filter would starve the car of fuel and if anything cause the car to use less fuel, not more ?

OP, does the car feel any slower ? Usually and particularly with dervs, fuel is power, more fuel, more power. If the fuel filter is blocked it may be struggling to get enough to the engine making it feel slower.
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      10-16-2014, 10:32 AM   #6
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If the fuel filter is clogged, this would lead to a decrease in fuel pressure after the filter, the engine demands said quanity fuel at a particular point on its power curve. The ECU would tell the fuel pump it need to increase its output to enable the fuel rail/injectors to meet this demand. Thus leading to an over compensation in fuel useage, due to the required increase in pressure, even still preventing complete combustion in the chamber if its really clogged, as not enough fuel combusting in the chambers to meet demand. Thus higher mpg.





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Originally Posted by Hulla the Hulla View Post
can you explain your thoughts on this please - surely a blocked filter would starve the car of fuel and if anything cause the car to use less fuel, not more ?

OP, does the car feel any slower ? Usually and particularly with dervs, fuel is power, more fuel, more power. If the fuel filter is blocked it may be struggling to get enough to the engine making it feel slower.

Last edited by PAULDON; 10-16-2014 at 10:39 AM..
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      10-16-2014, 01:31 PM   #7
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Thanks guys

ill check the temp while driving ill plug the Whatapp in and use live parameters to check, the car is running fine, pulls hards from any speed right up to 155 with no issues
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      10-16-2014, 02:42 PM   #8
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Just been for a drive of 13 miles took about 20 mins and only just got to 90 when arrived, mind you I have only been home 2 hours before using it so it wasn't stone cold started at 57 degrees
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      10-16-2014, 03:04 PM   #9
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Is it at 90 when driving?

A blocked fuel filter won't cause more fuel usage. All it will do it make the quantity control valve try to supply the most amount of fuel but it can't achieve it. At best you will get a quantity control valve fault. Which we see alot a blocked fuel filter will cause starvation not more usage!
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      10-16-2014, 04:09 PM   #10
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it could due to out of spec combustion . ... What did the faults come up with the BMWapp?

If the engine is reaching 90 it won't be your thermostats at least.



QUOTE=Dan-danGT;16790795]Is it at 90 when driving?

A blocked fuel filter won't cause more fuel usage. All it will do it make the quantity control valve try to supply the most amount of fuel but it can't achieve it. At best you will get a quantity control valve fault. Which we see alot a blocked fuel filter will cause starvation not more usage![/QUOTE]
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      10-16-2014, 04:21 PM   #11
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Quote:
Originally Posted by Dan-danGT View Post
Is it at 90 when driving?

A blocked fuel filter won't cause more fuel usage. All it will do it make the quantity control valve try to supply the most amount of fuel but it can't achieve it. At best you will get a quantity control valve fault. Which we see alot a blocked fuel filter will cause starvation not more usage!
Not while driving, more 78-85 degrees
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      10-16-2014, 05:00 PM   #12
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I had 86c coolant temp. Replaced both stats and now gets to 87c. It reaches 98c when regen is taking place.

Motorway mpg is 45-50mpg. Town stop start is 22-25mpg.

Not sure if the stop start mpg is normal but i have just accepted it.
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      10-17-2014, 01:21 AM   #13
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Mine runs around 88-90 but never goes above unless I'm doing the ring or a track day etc! You would change your stats not expensive its a start but it won't improve massively might stay 85-90 instead.

The only way to test a thermostat is to drive a car as stationary unless it's stuck closed it will get to 95-100c ish until the fan cuts in and cools it down slightly
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      10-17-2014, 04:13 AM   #14
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im going to have a play tonight again, ill drive as slow as i can around the back roads near me and see how it plays out, luckily for me my dad has a 335d aswell so i compare the 2 results
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      10-17-2014, 05:30 AM   #15
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Would you recommend using genuine parts or eurocarparts products as my local dealers Havnt got stock and I want to try this weekend while warm, plus I get 70% discount from ECP makes it even sweeter
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      10-17-2014, 07:11 AM   #16
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When I got mine done I made sure they used original BMW parts. Main was IRO £100 and the EGR stat was IRO £60 but don't quote me on those figures, my memory is shot as I'm old
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      10-17-2014, 08:06 AM   #17
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Close bmw want £30 for the EGR stat and £60 for the water pump stat

I don't mind fitting non oe parts as it will fix the issue might nt last long but clearly neither do the bmw parts, if my local had stock I would go genuine but I want to get it sorted this weekend, I'll be buying 1.5l of Coolant from bmw as that's important to get right as its just been changed by them a few months ago
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      10-17-2014, 08:18 AM   #18
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I'd get BMW stats.

Someone on here used ECP stats and they failed soon after.
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      10-17-2014, 09:53 AM   #19
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Thats the problem, but to be fair to them my stat blew on my 172 cup and was desperate got 1 from them at £11 and its been fine for nearly 1 year, been around the Ring 3 trips this year and 10 full track days in the uk

not skipped a beat, might just spend the £30 for the pair and see if it improves my MPG and then order the genuines for fitting when i can be arsed or not pissing down with rain
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      10-17-2014, 03:27 PM   #20
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Quote:
Originally Posted by Dan- View Post
Not while driving, more 78-85 degrees
Think you pretty much wasting your time changing your stats then bud, it stuck open you probably looking at low 70's constantly when on a run.

Didn't you have a load of fault codes relating to coils/valves also?
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      10-17-2014, 04:50 PM   #21
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i couldn't get it over 71 on a run tonight :/ until sat still and it created to 83

i did but I've cleared them
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      10-18-2014, 02:15 AM   #22
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If it's only 71 while driving defiantly get them changed. Do both there's no point doing one, if one is going so Is the other!

I did mine myself quite easy just a little fiddly the main stat is any way!
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