what affects diesel economy

corkgsxr

Besides oil and filters, a heavy foot etc

What mechanical bits affect economy in a negative way as the life of diesels go on

dgt

The diesel you put in

corkgsxr

dgt wrote: »

The diesel you put in

You recon its better to put in the likes of topaz than letsay maxol

dgt

corkgsxr wrote: »

You recon its better to put in the likes of topaz than letsay maxol

It's the other way around for me

Branded vs unbranded, it's a no brainer as to which has the higher chance of being crap diesel

Once it's getting up to temp and the egr isn't clogged the likes of the MAF would be worth considering, not mechanical as such admittedly

EGR and MAF (on most yokes) would be likely culprits of poor mpg on a maintained car with no stat issues imo.

corkgsxr

Tempted to strip the egr and intake and clean them all. Bit of work though.

So a seemingly happily working maf sensor could be on the slow decline?


By mechanical I also mean sensors and electrical stuff that keeps ya running

corkgsxr

corkgsxr wrote: »

............
So a seemingly happily working maf sensor could be on the slow decline? ..............

Perhaps, but there'd often be some performance loss too, performance loss can be less noticable than poor mpg though.

Cleaning the MAF may be an option.

corkgsxr

RoverJames wrote: »

Perhaps, but there'd often be some performance loss too, performance loss can be less noticable than poor mpg though.

Cleaning the MAF may be an option.

Prob a slow decline you probably wouldnt notice though

gctest50

Few ideas, all slight but might stack up against you

For choice of brand of fuel ask a few truck drivers

Injectors - not "atomising" the fuel as well as they used to
spray pattern not as good as it was

Timing chain stretch/wear

System voltage a bit low - slight chance, depends on how much the accountancy dept. cut back on the eleccy system

Gavman84

You could also get the car Terracleaned maybe. That's meant to clean out lot of the crud and deposits that build up in engine over the years. It cleans egr and manifold pretty much all the engine internals. Thinking of getting my own done soon anyway.

Popoutman

Injectors wear out eventually, usually at the actual spray hole, or internally where the "pop" valve is. This results in a poorer atomisation of the fuel for a given fuel pressure, and poorer atomisation means less efficient combustion and less overall efficiency.

Also diesel pumps can become less efficient with internal wear widening internal clearances. This could affect injection timing as well as affecting the available pressure to the injector.

shawnee

Having had a couple of bad experiences with lesser brand and cheap diesel , I try to stick to topaz or shell. There is a huge amount of dodgy diesel in forecourts and it can wreck injectors and pump. My mechanic informed me of this.;)

lomb

Sticking brake calipers will increase fuel use by 10%+

JohnBoy26

A blocked dpf would have a negative effect on fuel economy.

corkgsxr

lomb wrote: »

Sticking brake calipers will increase fuel use by 10%+

Defo no sticking brakes.

Im funny about brakes. Ebc pads and shoes and recent full fluid change for 5.1 proformance fliud. And new disks.

Can't bate great brakes

corkgsxr

JohnBoy26 wrote: »

A blocked dpf would have a negative effect on fuel economy.

Dont have a dpf. And recently removed the cat. Get between 20 and 40kms more to 20euro

My plan now is clean the egr, intake manifold and maf sensor

JohnBoy26

corkgsxr wrote: »

Defo no sticking brakes.

Im funny about brakes. Ebc pads and shoes and recent full fluid change for 5.1 proformance fliud. And new disks.

Can't bate great brakes

Even with new brakes the callipers could still be sticking. The brake pads could also be getting stuck due to being too tight on the carrier. Is one of the wheels warmer than the others after a long drive.

corkgsxr

JohnBoy26 wrote: »

Even with new brakes the callipers could still be sticking. The brake pads could also be getting stuck due to being too tight on the carrier. Is one of the wheels warmer than the others after a long drive.

No there fine. Im definite there working great

ciarsd

Other possibilities are suspect engine temps, low temps. Check the EGR cooler thermostat and the main engine thermostat.

DublinWriter

Are Tesco still supplied by Topaz?

George Dalton

I find that letting my brother drive has the biggest effect on my fuel economy. I usually get an average of 7.3 l/100km from the car. With him driving it is more like 8.5!

GTE

corkgsxr wrote: »

Tempted to strip the egr and intake and clean them all. Bit of work though.

So a seemingly happily working maf sensor could be on the slow decline?


By mechanical I also mean sensors and electrical stuff that keeps ya running

Its a lot of work alright but if you can easily take a pipe off one side of the EGR and check it that way, some gunk will always be there. The best way to clean it is to give the car a good hard drive and cruise in a gear lower so the revs are higher.

My EGR is very clean only because I drive the car on motorways a lot and a 5 speed box has the revs at 3200 or something.

The EGR problems of the past few years have been caused by more people getting diesels and running them for short sub 3000 rpm trips. I think the exhaust filter has similar problems. (DPF? The name escapes me now)

newmug

Gavman84 wrote: »

You could also get the car Terracleaned maybe. That's meant to clean out lot of the crud and deposits that build up in engine over the years. It cleans egr and manifold pretty much all the engine internals. Thinking of getting my own done soon anyway.

That sounds the business! Where would you get it done? Is it costly?

JohnBoy26

You never actually said what car you have? And what mpg your getting from it?

corkgsxr

JohnBoy26 wrote: »

You never actually said what car you have? And what mpg your getting from it?

1.6hdi 2007 Berlingo. 100k kms. About 40mpg mostly urban driving

Bigus

Depending on where you park it you could try an electric block heater to preheat it in the winter, significant savings on fuel for a small bit of cheap electricity, very common in Canada , efficient low rolling resistance tyres would give an improvement , but I don't know how you'd be fixed with van rated tyres





http://www.as-auto-parts.com/Citroen-Parts/bc-Citroen-Parts-xh-BERLINGO-(MF)-1.6-HDI-90-class1-Block-Heater-Kit.html

Bigus

Some ideas here free

Clean mpg.com

http://99mpg.com/

JohnBoy26

corkgsxr wrote: »

1.6hdi 2007 Berlingo. 100k kms. About 40mpg mostly urban driving

Imo that's not far off what you should be getting doing urban driving.

corkgsxr

JohnBoy26 wrote: »

Imo that's not far off what you should be getting doing urban driving.

Listening to others that have them I should be over 50mpg

pred racer

corkgsxr wrote: »

Listening to others that have them I should be over 50mpg

Id say your consumtion is fine and the others are talking crap;)

corkgsxr

part one completed anyway. egr and cooler cleaned. not a bad a job as i thought.


not that dirty either but i split the electronic part from the body of it. one concern of mine was it seemed very hard to split.

i think it could have been stuck in a partially open position. as the body part has to move to allow the electronic part to come out. went back very easy after cleaning and the mechanism on the electronic part seemed to move fine.

any thoughts on this.

intake next

Bigus

Whats your driving style are you heavy on brake pads, ? A gentler driving style can bring big gains in mpg .what about a stop start button if your regularly stuck in traffic, fifth gear did a test and this brought big percentage improvement on the same city route.

giant_midget

newmug wrote: »

That sounds the business! Where would you get it done? Is it costly?

I got this Terraclean done on my ball of sh1t 2002 Mondeo with 180k on the clock, Transformed the car totally - It's not as noisy on startup, less smokey (was not that bad to begin with)

The throttle response is vastly improved too. Im not gonna lie my ass off and say that i gained bhp because i doubt i did. It runs a lot "smoother" if you get me. I paid €109 if i can remember...

corkgsxr

Bigus wrote: »

Whats your driving style are you heavy on brake pads, ? A gentler driving style can bring big gains in mpg .what about a stop start button if your regularly stuck in traffic, fifth gear did a test and this brought big percentage improvement on the same city route.

I have a heavy foot but even driving very easy it doesn't seem to make much difference.

If it doesnt have built in stop start its a waste of time. If stopped for less than 30-40 seconds it takes more fuel to start than to just idle.

Reason its mainly petrols that have stop start is diesels use much much less to idle so the gain in tiny

corkgsxr

update. on a run (110kmph average) its now doing 48 mpg with abit of 2stroke and millers eco max,

just to rule out **** in the injectors. (ya ya i know the useless/useful debate but it cant harm)


still havent a chance to do the intake. but my minimum round town now is 40mpg