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  #1  
Old 12-09-2001, 11:37 PM
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Join Date: Jun 2000
Location: Baton Rouge, LA.
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Fuel milage takes a dump!!

OK guys, I need some troubleshooting advice. Over the last few months the fuel mileage on my 83 300D turbo has gone down the toilet. It used to get in the mid twenties, now it is in the mid to upper teen's. It has 195K miles on it, so, let me start off by telling what I know or believe to good. Fuel filters, glow plugs, (it start's great) I assume the compression is good, it uses little to no oil. Air filter and all are not to old Just did P.M. couple of thousand miles ago.
Now for some symptoms it has intermittent power. By that , I mean I can start off at a red light and it runs like a bat out of hell and two lights later it is a big dog until you get going. It does have more black smoke out of the tail pipe than normal. until you get up to speed. Also the black smoke seems to coincide with the loss of power. It almost seems to act like what I would think one with a turbo that is spooling up intermittently would feel like. This is my wife's daily driver and she is getting kind of testy about it.

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Keith Schuster
2006 E350 98K miles
2013 Ford Explorer 15K miles
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  #2  
Old 12-10-2001, 06:51 AM
LarryBible
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Poor fuel mileage in a diesel usually means a really dirty air filter or other condition that restricts intake flow. Is the intake manifold plugged up? Sometimes MB diesels will get a heavy coating of goo in the intake manifold. I have cleaned them before and this goo is like tar. A messy job.

Good luck,
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Old 12-10-2001, 07:02 AM
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Join Date: Aug 2001
Location: Northern Virginia
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Agree with Larry the air filter is the first thing to check. Also, how long has it been since you did the diesel purge or full bottle of Red-Line DFC? If you have dirty injectors they may be shooting a stream of diesel into the cylinders instead of a nice wide spray. That would require you to inject more fuel (more pedal) for a given level of power. Thus reducing the fuel mileage.

It doesn't explain your intermittant performance though. I would think dirty injector problems would be consistent.

Smell much diesel fuel - as in a leak?

Ken300D
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Old 12-10-2001, 07:10 AM
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Location: Baton Rouge, LA.
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Leaks

I replaced the retun lines due to leaks about 2 weeks ago. The air clearner is not that old, however I will recheck. Thanks for the replies I will keep you all posted.
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2006 E350 98K miles
2013 Ford Explorer 15K miles
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Old 12-10-2001, 08:28 AM
jcd jcd is offline
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Fuel Filters

Change them both. I noticed an amazing difference in performance and about a 10% increase in mileage.

JCD
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  #6  
Old 12-10-2001, 09:04 AM
LarryBible
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Fuel filters can cause a severe decrease in power, but will not typically cause a severe decrease in fuel mileage.

Have a great day,
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  #7  
Old 12-10-2001, 09:49 AM
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Join Date: Aug 2001
Location: New Jersey
Posts: 122
Have you checked the fuel tank vent? Me 300 SD was acting up, I noticed similar symptoms. I decided to change the screen inside the tank. While draining the tank, I noticed the fuel flow stop and restart, I cracked open the fuel filler cap, it cleared up and the fuel had a constant flow. Upon further inspection, I found the tank vent plugged, cleaned it and it ran much better. The screen inside the tank was not necessarily bad, but I changed it anyway.
When I bought my SDL, it was one of the first things that I checked.
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  #8  
Old 12-10-2001, 10:03 AM
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Location: Plano, TX
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Intermittent power can also be clogging of the banjo bolt which feeds the ALDA. Don't forget to remove & clean this with solvent as a regular part of PM.

- Jim

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