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#1
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Poor acceleration at low speed
I have a 1984 300D that I got done changing the motor on (previous owner threw a rod). I rerouted all the vacuum lines correctly, with much help from this site. The car starts and idles perfectly, but acceleration at low speeds (below 20mph) is HORRIBLY slow. I know these things aren't acceleration machines, but there is something definitely abnormal going on. Here's all relevant info I can think of:
- Car is very sluggish until about 20mph. After that the acceleration REALLY picks up. - Hard lines running to and from the ALDA system are all clean and properly connected. - The car DOES has a vacuum leak somewhere, as the motor still runs when the key is out. - Turbo functions properly. I can hear/feel it once the acceleration picks up. I did have to time the injection pump (using the drip method) since I swapped it over to the new block. I'm thinking adjusting this might be the first step. I'll want to turn the IP away from the block to create more fuel flow correct? Any other ideas of what the problem could be? Thanks, Brendan |
#2
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Is this by any chance the first turbo 300d you have driven?
They are quite sluggish for the first 50' or so. Also there are two turbos offered, one in supposedly more sluggish on take off. Also, are you sure you are not taking off in second? They are extra sluggish if that happens.
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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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Adjust the screw on top of the ALDA and your problem will probably disappear. Sounds like its not getting enough fuel until the turbo kicks in.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#4
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It is the first turbo 300d I have driven, but not the first turbo diesel. I know they are very slow at start, but when I put the pedal all the way down it literally does nothing for about 10 seconds. I wouldn't feel safe pulling out into any kind of heavily trafficked street at the moment.
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#5
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Thanks, I'll try that out. Do I basically unscrew it a little to adjust it?
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#6
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When my car was slow like that I found I had an incredibly sloppy throttle linkage. Taking out as much slack as possible greatly improve my acceleration.
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84 300D, 82 Volvo 244Gl Diesel |
#7
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Quote:
As Diesell911 mentions, check the linkage and that bushing on the firewall.
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83 SD 84 CD |
#8
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Extreme care is the operative word here. |
#9
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Quote:
What Carbon canister? Restrictor Pill? Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#10
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The carbon canister is right next to the blinker fluid reservoir and the restrictor pill is the little plastic thing on top of the flux capacitor...only operates at speeds above 88MPH.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#11
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Before you go off screwing with the ALDA is your throttle linkage hitting full stop?
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#12
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Yes, the throttle linkage is properly set. Does my car have a kickdown switch? Now that I think about it, it does feel as though the car is starting off in second gear. I guess one way to tell would be testing the acceleration in reverse. If it's still slugish then I'll look into messing with the ALDA.
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#13
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It should start in second gear when in "Drive" or the intermediate gear selection. But it should almost immediately downshift to first under anything more than the slightest load. In the lowest gear selection, it should start in first gear regardless of load.
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#14
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Mine does not downshift at the "slightest" load as indicated by the post above, I need to mash it kind of hard when coming from a rolling start. I will admit my transmission is pretty tired at this point though.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#15
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Quote:
Silver... count how many gear changes in forward, that'll let you know what gear you're starting off in.
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83 SD 84 CD |
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