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300TE Poor fuel economy
Time to tackle it again...
This has been an ongoing issue since I have bought the car. I've kept track of all mileage and the average I get around town+freeway is 15-16mpg. On long trips between states, I get 19-21mpg. Bought car 2006 @ 66k, I'm now at 107k Spark plugs are OE H9DC0 New wires, rotor, cap, ovp, (used) coil New o2 sensor, Duty cycle is closed loop 50% New injectors + seals No vacuum leaks of any kind all hoses replaced Rebuilt Fuel distributor + EHA All filters and fluids No fuel smells or any sort of fluid loss. Head has been rebuilt. About the ONLY item I have not replaced (although checked volts) is the airflow potentiometer....Voltage came out to spec. I guess also the idle control valve? I plan to flow test the fuel system to make sure that comes to spec, but I can't imagine its bad since I've replaced everything including the distrib! Any other ideas or suggestions? I KNOW I should be doing better than this. I would be much more content if I was getting ~20mpg average and I believe I should be.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
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3500lb car with no lock up TQ and mechanical fuel injection. Sounds about right.
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CENSORED due to not family friendly words Last edited by tjts1; 06-14-2011 at 11:36 AM. |
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My 260E gets about 21mpg avg regardless of how I drive. I accept that as reasonable, but I don't see a wagon losing 6mpg compared to it....The 2.6 vs 3.0L is offset by the rear-end ratio too... I average roughly about 240mi to a tank before light clicks on. My 260E gets about 320mi before the light clicks on.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k Last edited by ps2cho; 06-14-2011 at 02:31 PM. |
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bump....
Also I notice once in a while the car will surge at idle around 300-400rpm and I can see the economy gauge swing like crazy. Something is going on here.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
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300TE has lower axle ratio than 300E, so it's not just the aero and weight that make fuel economy different from sedan.
The W124 is the last of the "dinosaur" E-class. A nice W210 wagon with the new V6 and the 5-speed transmission will turn maybe 2700 rpm at 75 mph versus the 3500 rpm yours turns. The L-Jetronic is better than K-Jetronic, too, and it's a lot more efficient engine.
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Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles |
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FWIW, those #s are pretty close to what I get in the 4-Matic wagon unless I really pull the fuel out of it. Even then I've only gotten a maximum of 3mpg avg over the baseline through 1 tank. Have you peeked under the car to see what ratio diff you have? My 4-M has 3.29s.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff |
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Umm.... no. I don't see those kinds of numbers. I get 22 on the highway, down hill. roughly 18 in the city. The wagons seem to push a lot of air.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
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FWIW my 300SEL just gave me 15.4mpg last fuel up... combined. I usually drive it 65mph freeway at the most. I have hit 20-21mpg freeway only before, but this is just driving around 65mph. City only is pretty abysmal, I think I have kicked back 11-13mpg with the A/C on.
Same motor, similar gearing (3.46:1), similar weight. This car screams to have a five speed manual for the extra efficiency in lower gears, no stupid second gear starts, and overdrive. Too bad we never received that here. Your economy is fine. Oh I have been running 87 in this car for about 18 months with no ill effects.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
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I keep getting talked out of swapping this 5 spd stuff into my TE.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
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Quote:
Where is the diff ratio stamped on it? So these people claiming over 25mpg are BS'n or not calculating correctly?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
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I'm lucky to get 21 MPG highway. '91 300E. Different engine now, same result. Everything is now new in it. Don't see how it can get any better without a 5th gear on the freeway. That car is heavy! I get about 315 miles to the tankful with about 80% highway driving. When I refill, about 15 gallons.
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Quote:
Quote:
This + EFI (factory or MSQ) and 5 speed manual = perfect car for me. LHD of course
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CENSORED due to not family friendly words Last edited by tjts1; 06-25-2011 at 10:17 PM. |
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I would do the swap for a m104, just not sure about the m103. Plus, I would have to figure out the flywheel. The swap I did on my 300d was straight forward, no index marks. I have a 190e 2.3(?) flywheel, I just don't think it would work. Other than that I have all the other stuff, I got two of everything when I was at the yard one day.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
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Quote:
Perhaps one could achieve 25 mpg with an m104.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
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Quote:
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CENSORED due to not family friendly words |
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