Poor MPG E320 CDI W210

[television]

He's got one good unit with a dodgy display and one bad unit with a good display.


No..??

On my quick read I thought the changing was to correct the error in the reading

 

[KLP 92]

That'd be the same as this 220 then.

http://cgi.ebay.co.uk/2000-MERCEDES...oryZ9855QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

All the CDi speedos go to 160mph.

Just makes me wonder because the difference in consumption is approximately 1.5 times as much which tallies with four or six fuel injectors.

I bought it from a breakers who said its from a e320 cdi, there's no part number on there! I'll find out on diagnostics when i code it.

But why would the 4 cyl cluster cause the real term mpg to be so poor?

 

[television]

The normal procedure with cluster is to up load the info into STAR and download into the replacement cluster

 

[Dieselman]

I bought it from a breakers who said its from a e320 cdi, there's no part number on there! I'll find out on diagnostics when i code it.

But why would the 4 cyl cluster cause the real term mpg to be so poor?

I don't know unless it alters the way the injection system operates due to the variant coding.

I bet it is a 220 cluster as the tank on a 220 is smaller than the 320.

If you can get the coding reaad I bet it suits a 220.

 

[television]

A 4 cylinder rev counter would never work on a 5 or 6 it cant as it uses pulses from the CPS the more cylinders you have the more pulses to go with it. The IC could be changed over from the old one, this also applies to the injection and fule consumption rate

 

[KLP 92]

I have a 200 mile trip in the morning so i'll be using my old cluster. I'll let you know how i get on and fingers crossed i continue with my 40mpg average from today!

 

[se97mlm]

A 4 cylinder rev counter would never work on a 5 or 6 it cant as it uses pulses from the CPS the more cylinders you have the more pulses to go with it. The IC could be changed over from the old one, this also applies to the injection and fule consumption rate

Not quite true for later model Mercedes I'm afraid, the cluster software contains the calculations for all variants, and is coded on the production line (or at the dealer in the case of a unit change) to the car variant to which it is to be fitted. This saves a lot of bother and expense having a different software and hardware for each model or sub-model.

Kind Regards
Matt

 

[television]

Not quite true for later model Mercedes I'm afraid, the cluster software contains the calculations for all variants, and is coded on the production line (or at the dealer in the case of a unit change) to the car variant to which it is to be fitted. This saves a lot of bother and expense having a different software and hardware for each model or sub-model.

Kind Regards
Matt

Point accepted Matt and thank you, this means that the components are switchable either during manufacturing or on STAR
Would the info taken out be different and not contain the car model info, this would mean you still have to order new ones for the model that its needed for

 

[Dieselman]

I suspect the variant coding is in the engine ECU then, and passed on to the transmission ECU. Someone with Star must be able to change it, as I remember Steve the independent mechanic in Maidstone telling me how confusingly complicated it is the number of things you have to code. With the Daimler development tool, you can code entire standard vehicle configurations in one go, or change individual components, like the axle ratio.

I wonder how much fuel you'll save dropping the revs at 80mph from 2500 to 2300?

Not sure about the fuel consumption but as they say at ASDA..Every little helps.
It's more that the car feels under geared, which it is. MB just used a standard diff instead of specifying one for the more torquey diesels.

Even the 320 Cdi only uses 2.65 iirc, might even be 2.87.

I believe the Taxi version has a higher ratio though.

I thought I was looking for the gearbox coding and was able to retrieve that but not what code it needed to be set to, and MB at Milton Keynes were slightly less helpful than a chocolate teapot.

 

[Dieselman]

I have a 200 mile trip in the morning so i'll be using my old cluster. I'll let you know how i get on and fingers crossed i continue with my 40mpg average from today!

Be interesting to hear how you get on. Fuel economy and low down grunt are the only things that would tempt me into a Cdi from an 300.

The 300 is a lot quieter and infinately more reliable.

 

[se97mlm]

Be interesting to hear how you get on. Fuel economy and low down grunt are the only things that would tempt me into a Cdi from an 300.

The 300 is a lot quieter and infinately more reliable.

You need to try OM651; It's quite nice

 

[KLP 92]

Be interesting to hear how you get on. Fuel economy and low down grunt are the only things that would tempt me into a Cdi from an 300.

The 300 is a lot quieter and infinately more reliable.

Very true. I have the 250 engine in my W202 and i've spent less in maintenance on that in 4 years than in 6 months on the CDI Nothing ever goes wrong (frantically touching wood)

I've driven the 300td back to back with the CDI. The TD is alot more laid back and relaxing to drive, the CDI is eager and alot more potent as well as more economical. The main reason i didn't go for one was i wanted a fully loaded one and facelifts were more readily available.

The TD can be sluggish in certian bands, nothing a rempa wouldn't fix! Finding a relatively rust free prefacelift is impossible as well!

 

[se97mlm]

Point accepted Matt and thank you, this means that the components are switchable either during manufacturing or on STAR
Would the info taken out be different and not contain the car model info, this would mean you still have to order new ones for the model that its needed for

With Star it should be possible to code any cluster for any model. Exceptions being where the CAN bus topology is different (chassis/powertrain or M-Bus)

 

[Dieselman]

You need to try OM651; It's quite nice

I'll send you my address and let you know how it's fits..

Is it trully quiet though like a prechamber engine. One of my Guys has a 220cdi and it really sounds gruff.
Nice turbo arrangement, will they last.?

http://paultan.org/archives/2008/04/11/new-mercedes-benz-om651-twin-turbodiesel/

Look down the page. It's fallen apart already.....

2000bar pressure and I assume multi injections (5). How long will the injectors last before they wear out?

 

[Dieselman]

Very true. I have the 250 engine in my W202 and i've spent less in maintenance on that in 4 years than in 6 months on the CDI Nothing ever goes wrong (frantically touching wood)

I've driven the 300td back to back with the CDI. The TD is alot more laid back and relaxing to drive, the CDI is eager and alot more potent as well as more economical. The main reason i didn't go for one was i wanted a fully loaded one and facelifts were more readily available.

The TD can be sluggish in certian bands, nothing a rempa wouldn't fix! Finding a relatively rust free prefacelift is impossible as well!

I know of one..

One of my staff with a CDi wants to buy it off me....but I ain't sellin'....

My only regrets with the 300TD are that you do have to mine the performance to make it go as opposed to a quick stab of the accellerator, and it is too eager to change down a gear it could pull higher ratios no problem.

 

[KLP 92]

My only regrets with the 300TD are that you do have to mine the performance to make it go as opposed to a quick stab of the accellerator, and it is too eager to change down a gear it could pull higher ratios no problem.

I find that with the CDI as well. Not too bad in W mode, but still on a motorway its all to eager to kickdown to 4th even at 80-95mph, without kicking down. Problem is 4th gear doesn't give it any real significant power over 5th, as it misses the torque band!

If you remap the car it will stop doing that, it will utilise the torque more. I had the same issue with the C250, after the remap it doesn't kick down half as often.

 

[Dieselman]

Make sure your accellerator cable is tight enough to obtain full power just before the kickdown switch is activated.

You are correct about the revs going above the torque band which is exaccerbated by the slow change down of the gearbox actually losing speed.

 

[KLP 92]

You are correct about the revs going above the torque band which is exaccerbated by the slow change down of the gearbox actually losing speed.

Its for this very reason sprintboosters don't work well on diesels.

 

[KLP 92]

Right, did a 186 mile trip, mainly motorway and country lanes. Drove 80-90mph on the way there, on the way back took 3,5 hours due to M25 peak rush hour traffic. All in all my trip computer showed 37.2mpg, i put in 22.8 litres to get me 186 miles which equals to: 37.1mpg.

At the moment my fuel economy is fine with this cluster, the displayed mpg and actual mpg are near enough accurate.

The problem with the other cluster was it would display the same mpg average as my old one, but then the actual mpg was considerably less!

I would never have thought that a cluster would cause this problem, but it looks like it does.

Now with the other cluster i was putting 60 litres to get me 400 miles on a motorway with no town driving at a steady speed of 80-85mph. Today 22.8litres got me 186 miles, that includes traffic (standstill on several occasions), basically a 4 hour trip and an eager right foot at any oppurtunity!!

 

[Brian WH]

Result mate, glad you have finally resolved what can be an annoying fault.