It's only a part??? A part that costs like 200 bucks new. My pal in Austria who is rather knowledgeable in these matters explained it so: Around June of 1988 the Idle Stabilizer Control Unit was upgraded. The old part numbers are: 251 907 353 A for DJ motor code 251 907 353 B for MV/SS/SR motor codes After mid 1988 the newer ones had the following codes: 251 907 353 C for DJ motor code 251 907 353 D for MV/SS/SR motor codes The newer version has apparently a feature whereby when you take your foot off the gas (when shifting etc) the engine revolutions do NOT drop instantly to the established idle RPM. Instead it sinks slowly, and pauses at 1100 RPM for a few seconds before returning to idle RPMs. The newer part also compensates for increased loads (A/C, extreme steers with power steering, automatic transmission, etc.) differently by adjusting the idle RPM to 1100 under load (instead of maintaining the established idle under load as the old unit did). He also says that you can test both idle stabilizer systems by simply starting the engine. If the idle stabilizer system is working, the idle should rise to 1500 RPM (the newer control unit holds it at 1500 a second or so longer) and then the idle should slowly sink, settling in to the established idle speed. The old units also have a voltage regulator is designed weaker, and due to carbonization over time, will not withstand the 430 +/- 20 mA and will burn out. Another test you can perform is to bridge the power steering contacts in the pressure switch, and you should notice an increase in RPM of approx. 200 RPM. Thank you to Harold H. for this great info!! There is more (and it gets way too technical for me) to read at the address below about the entire digifant system: http://insel.heim.at/madeira/341126/FAQ_Ruckeln_mypage.html Unfortunately it is in German. (If I am lucky I may be able to get a hold of the schmatic for it, and then we can all rebuild ours!!) Enjoy! RSF IMPORTANT!!! In order to reply to me, you must have the word "FISH" somewhere in the subject line of the email. Otherwise it goes directly in the trash. <º)))>{ <º)))>{ <º)))>{ <º)))>{ <º)))>{ <º)))>{ Robert S. Fish Salzburg, Austria 1987 Wolfsburg Vanagon 2.1 GL Weekender 1987 Golf Cabriolet 1991 Golf |
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