Hazing D24+T

[volvo-dennis]

Hi.

I have owned a couple of D24's in the past years. But I have a "Hazing problem" with my current D24+T.

Specs / info:

- D24 with added Turbo (standard boost pressure)
- External oil cooler
- New 297 nozzles (pops at standard D24T pressure)
- New timing and pump belt (timing 0.86)
- 6 New glowplugs
- 3" JT Tuning exhaust system (modified gasser system from sweden)

When I start the engine in the morning, there is some grey-ish smoke. But when it is at operating temp, it still got this "hazing". Especially while pulling. If I floor it, the smoke turns black "as supposed".
But this "hazing" bugs me, because I can see it in the rearview mirror some times.

The engine does not burn oil or coolant. Wax-stat is new, no lumpy idle when cold.

Any ideas what the problem might be?

/Dennis

[745 TurboGreasel]

Missing LDA.

[volvo-dennis]

Ahh, okay. Is there a way to test the LDA without taking the IP apart? (Sorry, I forgot to mention earlier that the IP is a D24T pump).

[anders]

adjusting the LDA will not change the haze at idle or even part throttle. You can think of the LDA as a boost referenced max fuel limiter.

[745 TurboGreasel]

Undo the hose, and there is no change in smoke, it's stuck.

[volvo-dennis]

I tried to undo the hose. It do not pull as hard as it use to, and all smoke is gone! So the LDA seems to work as it should.

[anders]

So there is two ways to reduce the smoke, back off the max fuel screw 1/4 turn or put more spring pressure in the LDA.

[ngoma]

Originally Posted by anders

adjusting the LDA will not change the haze at idle or even part throttle.

If the top screw is screwed down too far wouldn't it preload the ramp pin too much and overfuel at idle and low boost conditions?

• If your smoke is only at full throttle load - back off the full load screw.
• If your smoke is at low end thru pull-up - Back off the smoke adjust screw on the top of the diaphragm housing. If you have dramatically adjusted the "star wheel" (the cogged adjusting wheel under the diaphragm) it can have the same effect, as even very slight boost will cause it to move to "full fuel", instead of waiting for the turbo to spool up a bit. Adjust the star wheel back a bit to reduce the smoke level.
• If smoke is heavy at immediate start-up - fine adjust the smoke setscrew.

from http://dodgeram.org/tech/dsl/more_power/Power_ve.htm

Originally Posted by anders

You can think of the LDA as a boost referenced max fuel limiter.

I think of the LDA as a boost referenced no- or low-boost fuel limiter. Max boost gets max fuel, low boost gets fuel cut.

[anders]

The LDA does not and will not change fuel delivery rates at idle. It can with enough throttle input change the fuel rate.

Pull the top of the LDA off and while the engine is running at idle push the diaphram down, you will not see a change.

The way the LDA works is by limiting the tension lever travel, only with enough throttle input will the tension lever hit this stop.

You would not want the LDA to control fueling without throttle input, as you could be engine braking down hill and still be able to produce sufficient boost to get higher fuel delivery, then there would be no engine braking at all.