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Very weak acceleration and weird idling
A few weeks ago, I made the mistake of letting my '78 300D run out of fuel. Had to replace fuel filters and primer pump before it would start again, but now it doesn't feel the same to drive. The acceleration is noticeably weaker than before and I can't push it over 40mph even when FLOORED. The pedal was sticking as well, but a friend fixed it by adding a spring to the throttle linkage. Didn't help the acceleration though.
It's also idling weird -- starts off kind of slow and a little shaky like the engine is about to shut off (as it has before on a few occasions when stopping or driving really slow) then picks up as if the pedal is being pressed slightly. Starting it has never been smooth, but now it's worse. I generally had to accelerate while starting it but now it turns over a few more times than usual before it starts.
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
#2
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Sounds like you have bacteria covering your screen in yoiur tank or in the fuel filter. I suggest dosing your tank with a biocide and killing off the bacteria. they will then go through your filters and burn off.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#3
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It does sound like fuel starvation. Has the car been run on non diesel fuel in the past? Has the car had fuel related problems previously? You may have air leaking into the fuel system around where the hoses connect to the primary filter. Could you put some details about the car (mileage) in your signature please.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#4
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did you loosen all injector line nuts at the injectors when cranking after the filter change? often these cars get an air lock in the lines... try loosening the nuts on all the injectors, and cranking over the car. make sure you get fuel on ALL nuts. and no bubbles are present.
fill your fuel tank to the brim. then swap the supply and return fuel hoses and see if the drive improves. is your primary fuel filter clear or fogged? if clear. look at it after you've driven a while, and see if you have any gunk in it.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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X2 on switching supply and return. You could also run the engine on an alternate fuel supply in a jug in the engine compartment and see if it runs ok then. If it does, problem is in the fuel delivery system somewhere.
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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 |
#6
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
#7
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Good luck!! Please let us know how you go.
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#8
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Acceleration is normal after removing the spring my friend put in the throttle linkage...but the pedal is still kinda sticky at times and I've been noticing a low creaking that I suspect is my brake caliper seizing (happened to my last car, right rear wheel, absolutely destroyed the rotor). Definitely gonna see if O'Reilly has StarTron or something similar when I cash my paycheck tomorrow.
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
#9
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You often have to go to a farm, truck or marine supply to find it.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#10
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I agree with t wal, try a marina, farm supply store or truck stop.
Lube all the ball and sockets in the linkage train, also follow the cable at the firewall down to the plastic bushing, lubricate it too.
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83 SD 84 CD |
#11
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
#12
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I try not to immediately see correlation as causation, but it seems like ever since putting Killem in my tank, it's been increasingly more difficult to start the car. I just spent $40 filling my tank this evening and after shutting the car off and letting it sit for 5 minutes while I grabbed something real quick from the house, it won't even start! I seem to have a very minor leak in the fuel hose that goes to my primary filter from the tank but I really doubt that's the problem. When I say very minor, I mean there's a very small puddle under the car after several hours but nothing noticeable like fuel spraying out.
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
#13
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Fuel seeping out means air can get in, especially if the screen is plugged. Try running it on a jug in the engine compartment.
__________________
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 |
#14
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If the biocide just kills the stuff then it could certainly still be clogging your tank screen and fuel filters. That's why I'm a proponent of Startron, the enzymes gobble up the goop and break it down to particles small enough to pass through filters and into the combustion chamber. West Marine sells it.
Fix the fuel leak first though.
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Joe ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1980 300SD - 495k miles - 'The Ambassador' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Former Family Members 95 C280 73 280SEL 90 300D 87 300SDL (X2) 86 560SEL 84 300D 80 300SD |
#15
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I'm hoping I didn't put too much Killem in...started with approximately 5mL on Monday at 3/4 tank and 5 more after putting in 10 gallons today. Maybe in the future I'll clean my system with biodiesel.
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1985 190D 2.2L 717.411 5-speed 1983 300D Euro OM617.950 |
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