Quote:
Originally Posted by Shortsguy1
I recently acquired a 1987 300TD wagon with 190,000 miles. It accelerates sluggishly from a stop, but the turbo works great at higher rpm/speed. 0-60 time is 14 s. I cleaned out the pressure line from the intake and verified there is a pathway for pressure to the ALDA. Not surprisingly, vehicle performance didn't change. I have disabled the EGR and ARV (temporarily, of course), and any improvement of the accel was mild if at all. 0 to 60 time is still 14s.
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Your 0-60 time is not bad... a bit slow, but not terrible. It does sound like you need to adjust or shim the ALDA to improve the off-idle power.
Quote:
Originally Posted by Shortsguy1
I applied pressure to the ALDA and it leaks. Specifically it leaks at about 1 psi per second. I pump it to 12 psi, and it leaks down at that rate. In searching the archives, it appears that many years ago, this leakage rate was considered acceptable and not worth fixing. Is that still the consensus?
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This leakage rate is not bad. When the seal is totally shot you can't pump it up to 12psi by hand, it leaks as fast as you can squeeze the MityVac handle. I'd say the seal replacement is optional. I've got a new shaft seal I'd sell for $10 shipped if you want it.
Quote:
Originally Posted by Shortsguy1
The ALDA screw is intact, but I don't know yet if it has already been shimmed. Pulling the ALDA will clearly be a next step. But if I am pulling the ALDA off to shim it, I am trying to see if I should address the leakage at the same time. If it is worthy of fixing, what is the best approach? Used ALDA's on ebay are ~$70.
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Most likely everything is original/stock. Keep in mind that used ALDAs will probably have the same issue as yours, or worse. No point in replacing the ALDA unless something is physically broken inside. For test purposes you could go for a drive with the ALDA removed and see if there is a major change in power. If so, shimming/adjusting should cure your problem.
Quote:
Originally Posted by Shortsguy1
As an aside, elsewhere someone recommends using a ADA washer on the ALDA (part 007603014405). Has anyone tried that part?
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I don't think I've tried that particular washer, but it may fit. The bigger problem is the thickness, if it's too thick, they are difficult to file down.
