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Re: 99 Mixture and Electricals
Posted by Stephen Goldberger (more from Stephen Goldberger) on Fri, 23 Aug 2002 15:48:48
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>   Could this be a ground fault?  Also, where can I get a better
>electrical schematic?  All I have is a Haynes guide

Failure modes that include multiple problems in otherwise unrelated 
circuits usually are bad grounds.  (note, a 'ground fault' is a specific 
term for a situation in home wiring where the current is routed to 'earth' 
rather than the 'neutral wire.'  This can occur when a human becomes part 
of the electrical path between the 'hot' wire and the home's plumbing, so 
by code electrical outlets in bathrooms are protected through 'ground fault 
interrupters', or 'GFI'.  These devices break the circuit when the current 
flow is unbalanced - more current going out than coming back - as well as 
for overload.  The term you are looking for is 'faulty ground connection'.)

There is an excellent 99 manual by 'Bentley' which is in reality a licensed 
copy of the original factory service manual. You can acquire these from 
several sources listed in NINES magazine, such as Trollhatten motors, Garry 
Small Saab, and others.

>   The car is
>idling very high  but when the engine is cold, the car
>sputters and coughs and loses power if I push the gas in more than maybe half
>an inch (this problem goes away after the engine warms up).  Could this be a
>CO sensor?

Unless you have a California car, it could not be a CO sensor.  From 1975 
through 1979, there were '49 state' 99s which lacked a catalyst and CO sensor.

More likely, it's either the warmup regulator (misnamed, since it regulates 
fuel pressure both warm and cold) or the cold -start valve/impulse 
switch/thermo-time switch system, which acts like a carburetor's 
accelerator pump when the engine is cold.

Stephen Goldberger, Editor and Publisher
NINES, the magazine of the SAAB Club of North America
vist our web site at http://www.saabclub.com
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