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Old 04-01-2017, 02:36 PM
adamdrives adamdrives is offline
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Join Date: Feb 2016
Location: Hudson Valley NY
Vehicle: 1985 744 D24T M46
Posts: 147
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Quote:
Originally Posted by anders View Post
I will try to explain it.
The LDA is a fuel limiter, it actually limits the travel of the tension lever in the pump. When you supply the LDA with boost the control cone is pushed down via the pressure placed on the diaphragm, as this is pushed down the guild pin slides inward changing the point in which the tension lever stops.

The best method to adjust these pumps is to adjust the smoke screw on the LDA all the way out to remove any preload, then disconnect the boost reference line to the LDA and drive the car around at low rpm full load to adjust the smoke via the max fuel screw.

If you can't eliminate the smoke there is something else going on, maybe bad injectors, timing not advanced enough, worn out engine, one cylinder severely low on compression, bad valve guides and seals, ect..
Thank you for the recommendation, I will try that. When adjusted properly, should the car not make any/very little smoke at low rpm high load? For instance, lugging along in 4th at 2k or so, putting pedal down, I will get smoke. Is that simply inevitable? I've noticed I tend to try to stay in higher revs (2.5-3k), because if I need to change speeds in high gear it's difficult to do without making a hazy cloud, which I don't like. Getting started in 1st and 2nd gear also seems so leave some smoke.

I would like to have my injectors reconditioned in the future to set a baseline. I have no record of them being replaced or serviced. I have a spare set which would make that process easier.
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1985 744 D24T M46 49mm t3 @20psi 280k
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