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#1
07-03-2003, 08:06 PM
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Poor Gas Mileage
I have had my '84 300D for about a year now and have never gotten very good gas mileage. I have tried just about everything imaginable to rectify this, to no avail. I have repalced fuel filters, air filter, tried diesel additives, adjusted valves... Every now and then I will get 21mpg on the highway, but most of the time I get around 19-20mpg. Driving daily on the freeways, it is much worse. Any further advise to raise it up a little would be appreciated.
Mike
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Mike '80 300D '84 300D '85 300D '87 300D 
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#2
07-03-2003, 08:08 PM
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Have your injectors checked ... and while they are out.....
pull your precombustion chambers and inspect them.....
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#3
07-03-2003, 08:17 PM
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if my injectors were bad, would it idle rough? I would also think they may be nailing a bit if they were bad too. She runs like a champ with lots of get up and go. At idle she is smooth as silk and doesn't make any funky noises.
Mike
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Mike '80 300D '84 300D '85 300D '87 300D
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#4
07-03-2003, 08:22 PM
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Mike, that is low. My 1984 is also low, but manages to get 23-24mpg most of the time, mostly freeway, or 21-23 in the city. That is below what it SHOULD get, which is 25-30 (city-freeway). There are a zillion things to check - use the "search" feature and you'll find numerous other threads on this topic. Wouldn't hurt to make sure the brakes are not dragging at all - should spin freely. Otherwise it could be the injection pump, over-tweaked ALDA, way retarded IP timing, or a number of other things...
Good luck,
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#5
07-03-2003, 10:19 PM
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Sublettm,
I know what the problem is causing the poor GAS mileage: You should be using Diesel fuel. P E H
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