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Check vac lines again--sounds like that's the problem >
Posted by Micah in NC (more from Micah in NC) on Mon, 26 May 2003 07:39:41
In Reply to: idle question, Chad, Sat, 24 May 2003 09:05:25
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Chad,
Did you check the vacuum lines going to the vacuum reservoir (over by the power steering fluid reservoir on your '90S)? Check those and also the HVAC (heating, Vent, air conditioning) lines. Sounds like that could be the problem if the idle speed stabilizes when you use your defroster (I'm assuming you meant the FRONT defroster, not rear electric defr.)
Also, check the vacuum motor which closes the fresh air intake flap (for cabin ventilation), in the engine compartment. (Flap is spring-loaded to return to open position.) If this vacuum motor's diaphragm doesn't "hold" vacuum--i.e. keep steady reading when tested with a handheld vacuum pump--it might make for a huge vacuum leak. And then, there are about five or six other vacuum motors to open/close air flapper doors in the cabin...
Also, if your meant using the REAR defroster and/or A/C switch stabilizes the idle, then I'm at a loss and all of the above probably won't apply!
I would get a Bentley manual for the 16V 900, if you don't already have one; it's a really good reference (and makes for interesting reading if your a gearhead like me!).
Hope this helps!
Micah in NC
'84 900S, 236K mi.
'89 900S, 108K mi.
posted by 216.77.23...
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