I read that here and was happy that I had a W124, getting 33 mpg combined on B100. Then it pooched the motor due to a vaccum pump fiasco. Replaced it with a W210. Now its at 28-ish.

Why? I should check the registrations, maybe the W210 is heavier? Assume with some chip control in the 97 it would be better? Sure teh 95 mill has loose, but assume better sealing in the 97 would offset tighter internal clearances.?

Have done the usual filter changes. Did pick up 1 mpg with an air filter change.

Lastly, has anyone messed with a custom chip in their 97? Can anyone recommend a company?

Can they defeat the EGR using electronics?

THNX!

Hmm, the wider tires won't help, how about final-drive gearing? Same or lower? Maybe the '97 needs an IP and nozzle tune-up.

Oh, and your signature, ...

__________________

Gone to the dark side

- Jeff

Awareness of the EGR.

Oh ,Yeah...Is there any performance differences between OM603 and OM606?

"Ve must Always remember,the Teutonic Cousins, never set out to build
Eco/Econo-boxes.

__________________
'84 300SD sold
124.128

The turbo 606 seems to have less turbo lag than the 603's but performance wise they are simliar. Both are strong motors and I would even go as far as saying that the 603 is a little more civil than the 606's. Maintenance wise, I think the 603's are much more easier to work on than the 606's. With that being said I prefer the feel of the 606 over the 603. It just sounds better and delivers more useable power much quicker.

__________________
2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL

This 606 pulls like a turbo 603. ( I also have a 500+ hp car, so "pulls" is a relative term) I am not disappointed with it. Engine/car only has 105,000 on it, I doubt injectors need any service. I did purge them when the car came home. Idle is smooth as glass, except on hot starts. ( it may be mounts ) Strong running mill. Oddly, the pooched 606/910 would lose some TQ when you fed it B100, not the 606.912. IT runs as strong on B100 as D2. I like that.

I'd like to get a bit more comfortabe with the engine controls, and if the ECU controls the IP, maybe even custom chip the buggy. I think defeating the EGR might be a good thing.

Yeah, not complaining here, near 30 mpg combined with fuel that runs us $1.00/gal is pretty sweet. And the chics think I have money. Too bad I'm 50, fat, bald and BROKE! and married.....

I'll get on the sig. Heartbroken on that 95. CHANGE YOUR VACUUM PUMPS BEFORE THEY FAIL!!!!! That car alwyas had some issue with the engine, even after I had the cyl head gone through. The Neil DIamond listening 2nd PO likely beat the crap out of it by never changing the oil. I did all the Viton seals etc. Bummer. Well, it was my first. I learned.

The '97 E300D (OM606NA, W210) is slightly more electronic than my '96 but AFAIK the EGR computer controls only the EGR and the idle speed plus the flaps. The big change for '97 IMHO was the electronic 5-speed transmission. I don't think there's anything to 'chip' on that engine. You can defeat EGR simply by blocking the flow through the valve -- put a solid gasket between the EGR valve and the air intake line.

Our '96 E300D (W210, OM606NA, 263,000 miles) in mostly around-town driving has averaged 26.8 mpg over 4,282 miles in 2009. The '87 300D Turbo (W124, OM603, 149,000 miles) has averaged 25.2 mpg so far in 2009 (5727 miles). The '96 gets around 30 in extended over-the-road trips while the '87 never gets to do trips like that but probably would have similar fuel economy. YMMV.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

THNX Jeremy. The 95 was cake, plugged the vac line with a .22 bullet. Sure this would throw a code if I did.

Boy, 124s certainly rule the mpg criteria. I got near 37 on the way home from picking it up. ( D2 mpg was always 10-15% higher).

It must be a lighter car is all I can reckon.

You can read in this thread that I started how I went from 28mpg to 34mpg in my 210:

Poor fuel mileage on 210

Scott

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Scott
1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
1987 Porsche 911 Coupe 109,000 (sold)
1998 Mercedes E300 TurboDiesel 147,000 (sold)
1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!)
1997 Mercedes E300 Diesel 236,000 (sold)
1995 Ducati 900SS (sold)
1987 VW Jetta GLI 157,000 (sold)
1986 Camaro 125,000 (sold - P.O.S.)
1977 Corvette L82 125,000 (sold)
1965 Pontiac GTO 15,000 restored (sold)

Several forum members have reported excellent fuel economy with the 606 engine in the '95 W124 chassis. Weight, weight distribution, gearing, smog stuff, etc., may all play a part. The large fuel tank really helped the range; I have read here that Mercedes advertised a 750-mile range for the '95 E300D.

Be careful with your terminology: your '95 had a 606 engine while the earlier 124 models had a 603 or a 602 (both turbo in the USA, other parts of the world could get an NA version). The 4-valve head of the 606 engine should breathe better than the 2-valve 602/603. W210 cars (1996-1999) had 606 engines, NA for 96-7 and turbo intercooled in 98-9. The latter should be the most efficient.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

all I can say is every time I see a 124, all I can think about is how small it looks compared to my W210.

if you're going to compare fuel milleage... I wouldn't.

if you want a 124.. go get one.
But as far as I'm concerned... W210 and don't look back.

99 E300...... 28 mpg.... going 80 or putting around town.. it's about the same... the only time I get better mpg.. is when I put put along at 50 mph... for a whole tank... (can't stand that)

I've had both.

Fuel tanks seem to be the same capacity, around 20.5 gals.

Scott, thnx for that, altough I've done those things.

I am considering a W210 in the near future and researching first. I would prefer a wagon, they seem few and far between. Any idea on production numbers? Regardless of sedan or wagon however, it seems that I might like the Turbo IC version of the 98-99 much better than the 96-97 N/A. Does any one have link to various known issues? Is there perhaps a list of pre-purchase items to go through? I am finding cars from 6,000-18,000$ with Mileage all over the map (80k-500k). Mileage doesnt concern me on a vehicle that has been mitculously maintained and is priced accordingly.

Our W123 is treating us very well and I would like a newer diesel. The W210 has caught my eye.

Any help or direction would be greatly appreciated.

Thanks in advance.

__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

The W210 wagon was available as a gasser only. The last Mercedes diesel wagon was the 1987 300D Turbo (W124, OM603).

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I have to buy the FSM. Only one I've seen is near $200! Star Service or whatever they call it.

The EGR plumbing has a sensor that many lines run into, and after you turn the car off, it still makes noise, like its bleeding off vaccum. Normal?

My wife has a 99 wagon, gasser, which she bought after I brought the 95 home a few years ago.

Why would they do that? That is unfortunate.


Could you better explain what the important point is? I didnt quite get this little bit....."AFAIK the EGR"

__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.