Alda screw at stop, no smoke?

[MotorCityMadman]

I've read thru several of the ALDA threads and tried adjusting mine in my 84 300SD. The cap had been removed previously by??? I was able to back the screw out another couple of turns till it would not turn any more. The low end power was better but there was no smoke under heavy load. The only black smoke tha can be seen is when you blip the throttle as the rpm snaps back there is a little puff of black.

As well I've read that my 0-60mph times should be close to 11s. Before I adjusted the ALDA they were high 17s. After, despite the better response in the low range, the times were still high 17s. New fuel filters and a rebuilt lift pump as well as a new idle rack bolt.

Any ideas from the experts?

An 84 300SD in perfect tune will have an honest (no cheating) 0-60 in 15-16 seconds, maybe as low as 14 in ideal conditions.

[JimFreeh]

See if the ALDA holds vacuum, might be bad.

No. Never use vacuum to test it you'll, just be wasting your time. It works by positive air pressure and the turbo has an infinite supply of it to work with.

[JimFreeh]

Originally Posted by ForcedInduction

No. Never use vacuum to test it you'll, just be wasting your time. It works by positive air pressure and the turbo has an infinite supply of it to work with.

True, it is a positive pressure that extends the rod. However, if the diaphragm is broken, it will not hold vacuum.

I've had it happen to me.

Jim

[MotorCityMadman]

I'll try the vacuum test of the daiphram, thanks. I'm also wondering if the fuel release? valve in the lift pump might be stuck. I'll try get it out and clean the ball and spring. No fuel, no smoke???