I have a 91 td jetta with a td pump that has the idle speed boost system as shown in the VW GTI, Golf, Jetta Service Manual for years 1985-1992. In section 6, page 11, Fig 5-3, line item #2, it shows the manual adjustment rod connected to the cold start handle.
I found that my pump is missing the adjustment rod. The mechanism works, because I pulled out my cold start cable, started the vehicle and manually rotated the idle boost lever.
Bottom line, does anyone have the missing rod they would sell to me? Thanks. ken