A few months ago I turned my alda screw too far and it came right out.Can anyone tell me what happens as a side effect, and should I cover the hole where the svrew used to be?

Take the ALDA apart, but be very very careful. I have had mine apart and put it back together. It's just a diaghram.

Either your IP will be giving to much fuel or not enough fuel. You can tell by the amount of black smoke in your exhaust.

Good luck

Marty

You broke your ALDA. You will need to replace the capsules inside or the entire ALDA. The screw is soldered to the bellows and pulling it out broke the calibrated seal inside of it. This will cause it to fully expand, take away fuel, and not adjust for boost.

This is what you did: Image link The bellows on the left should have the screw attached to it.

Should the ALDA bellows consist of two separated bellows units or should the two bellows units be rigidly joined.
Mine are in two parts and when pressure is applied the lower bellows unit is pushed down to apply force to the IP rod, that would reduce fuel instead of the bellows contracting and reducing force on the IP pin to deliver more fuel.

What kind of car do you have? I have a few lying around that, as far as I know are in good working order. For OM60x engines.

As long as it's broken, see how it drives without it. Just remove it and plug the pressure line.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife