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Old 06-09-2008, 12:11 AM
richclan's Avatar
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Join Date: Oct 2006
Location: N. West NJ
Posts: 153
Lightbulb non-linear throttle response

this sounds a little weird but its happens more often now.
1985 300dt auto. 55k miles
lets say that the throttle travels 3 inches total
sometimes 1 inch of throttle launches the car faster than WOT from standstill.
this car is not a slouch at all it just doesn't like WOT
fyi air cleaner is good and i keep it serviced well.

my ?'s are:
could it be the ALDA and how can i test it to eliminate it?
a lot of threads find removing it (ALDA) increases power. what do you all think of this?
i saw some threads on restricted exhaust systems. is this common?
thanks in advance.

Current Car:
1985 300DT 55K miles
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Old 06-09-2008, 12:13 AM
Palangi's Avatar
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Try it with the air conditioner off.....

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Old 06-09-2008, 12:16 AM
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When you use WOT from a standstill, does it seem to hesitate them give you excessive smoke? On mine, I found that setting the ALDA too "rich" seemed to over-fuel the engine and cause hesitation at low rpm. Also, the '85 has a unique injection pump, so you might have something else going on. I would try to diagnose and resolve the problem before removing the ALDA.
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Old 06-09-2008, 01:40 AM
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Location: Vancouver WA
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It sounds like it could be ALDA related. Just don't bury your foot when you are starting off, you should gradually "feed" in the fuel with your foot.

The '85 IPs are not different other than the fact that they have an electronic rack position sensor on them.
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

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Old 06-10-2008, 12:37 PM
richclan's Avatar
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Join Date: Oct 2006
Location: N. West NJ
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the A/C was not on

no visible smoke from the tailpipe on WOT and NO hesitation felt. it rides great only i feel it could use more power, especially with A/C on and/or going uphill

remember it has only 55k miles

some threads recommend removing the vacuum lines from the EGR to get more power, however on an 85 with that electronic rack position sensor can i do that?

and then there is that ALDA thing i know nothing about
Current Car:
1985 300DT 55K miles
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Old 06-10-2008, 03:16 PM
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Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,438
Maybe an issue with the throttle bushings or linkages?
-diesel is not just a fuel, its a way of life-
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'17 Metris(VITO!) - 30k - wifes (OC-34k)
'09 Sprinter 3500 Winnebago View - 61k (OC - 63k)
'13 ML350 Bluetec - 84k - dad's (OC-86k)
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Old 06-10-2008, 10:39 PM
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See if your throttle linkage is up to spec. There's a small 10mm nut that holds the line from the firewall to the main levers at the IP area, that sometimes works its way loose (but won't fall off). This gives inconsistent feedback from engine response and pedal input.

Also check the bushing at the firewall, if it's going bad it can give the same inconsistency.
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Old 06-13-2008, 11:42 AM
richclan's Avatar
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Join Date: Oct 2006
Location: N. West NJ
Posts: 153
throttle linkage is fine that i can see.
is there any kind of boost limiter on this car that is adjustable?
waste gate opening up to soon?

Current Car:
1985 300DT 55K miles
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