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#1
03-11-2007, 08:22 PM
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Sudden LOss of Power!! Oh 'NO!!
1984 300SD
Help!! My car has suddenly lost all of its power! It used to be a beast! It had power, it accelerated quick, and the engine would shake the car. It was a thrill to drive. It had the Diesel Extreme makeover kit. Valve adjustment Radiator, water pump, thermostat ect replaced And that was only a couple of weeks ago. But now since doing these other things, all power is loss. Change fuel filter, thermostat, ignition lock and housing, and all the fuses.... This is very strange...I miss the POWER!! It used to easily reach 90-100+ on the freeway. Now I leave my foot on the floor and barely get 60MPH! I am guessing it might be something with the vacuum system. The driver side door locks still opens and closes the other doors, but is a lil slow. Anyways What should I do???  Thanks!! 
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#2
03-11-2007, 08:25 PM
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Quote:
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#3
03-11-2007, 08:26 PM
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Vacuum problems are unlikely to cause power problems. Check your throttle linkage and fuel flow.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
03-11-2007, 08:33 PM
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Make sure you didn't knock the ALDA line loose
__________________
Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline!
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#5
03-11-2007, 08:44 PM
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Thanks for the quick replies guys!
I will definitely check the fuel lines and ALDA tomorrow. And yes, both the fuel filters were changed out. I also have Diesel Clean, and Fuel Right, diesel fuel conditioner in it. Do you think that that may have clogged the filter in the fuel tank? Anyways, thanks again for the replies. And I will let you know what happens. Tony
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#6
03-11-2007, 08:50 PM
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Some time back, a forum member reported a similar problem. After much discussion, investigating and trouble shooting, he discovered the problem. The carpet was bunched up under the accelerator pedal.
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#7
03-11-2007, 09:03 PM
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How much diesel do you have in the tank?
The tank strainer could be partially clogged, causing the car to bog when the level gets low.
__________________
Andrew 1989 Volvo 745- 202K
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#8
03-11-2007, 09:05 PM
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Humm, it can't be the carpet one.
Although it would be cool if that was the case for me. But yeah, I am literally flooring the acceleration. And it goes through all the gears. Before it would just zoom! after it hits 2nd gear And now it would go to 3rd or fourth gear going 30-40 miles in the city. It feels as though, walking would be faster.
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#9
03-11-2007, 09:09 PM
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The gauge on the instrument cluster, says that it is about halfway full.
But I am unsure of the accuracy of the instrument cluster now. Because I have just changed the Odometer gears. And have bent the needles in the cluster while dusting them. I will fill up the tank tomorrow, just to see what happens.
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#10
03-11-2007, 09:11 PM
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Quote:
I could be the tank strainer, wouldn't hurt to pull it and change the short rubber fuel line if that hasn't been done, also check the vent and return lines on the other side of the tank.
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#11
03-11-2007, 09:13 PM
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BTW how you test, that the tank strainer is clogged?
And how would you change that?
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#12
03-11-2007, 09:48 PM
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The tank strainer is pretty course. If there is enough junk in the tank to cause a problem, your primary (in-line) fuel filter would likely get full pretty quick.
You could try putting some compressed air in you fuel supply line, which would clear the strainer temporarily. Remove the fuel tank cap if you do that. Or rig up a fuel container under the hood for test purposes. Also check to see that you don't have negative pressure in your fuel tank, as would happen if you tank vent was inoperative. (You might try a test run with the fuel cap removed.)
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#13
03-11-2007, 09:53 PM
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Purge the system.
Run a can of Diesel Purge through the system, or a qt. of Marvel Mystery Oil. FULL CONCENTRATION. Sometimes the tiny holes on the prechamber tips get obstructed by gunk causing the symptoms you describe.
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#14
03-11-2007, 10:13 PM
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Wow! all really great ideas.
The fuel filters, when I replaced them were pretty clear. And the fuel going through them is clear too. I will try that Marvel Mystery oil. I heard great things about that. Its supposed to be like a, super diesel purge. And i am thinking about emptying the tank and checking the fuel strainer. Is the negative tank, removing the fuel cap, supposed to trouble shoot the fuel strainer being clogged?
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#15
03-11-2007, 10:30 PM
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Before you start purging and stuff, check the simplest thing, which is the throttle linkage. Have someone else floor the pedal with the car, watch the linkage, does the linkage come within .5mm of the throttle stop on the IP?
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123.
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