When slowing down to a stop, or sitting at idle, the engine speed will drop, then recover. Engine has quit once when coasting to a stop at a light. Similar problem existed for a while about 3 yrs ago, went away, then recently came back when I replaced the alternator voltage regulator.
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SOURCE: volvo V70 electrical problem
had the same problem with an s80 this week- no warning lights nothing. was the regulator. when you have it fixed cancel all the trouble codes as when voltage is low everything registrs low signal input and makes the car go into get me home mode.
SOURCE: At idle the engine revs up and down
engine lite on? would ck to make sure there is plenty of coolant in system. low coolant may cause idle hunting. also could have a vacuum leak or air intake restriction. ck air filter
SOURCE: 97 Subaru Legacy GT Alternator Voltage Output
Battery is probably on it last legs... alternator sounds normal.
SOURCE: 1999 Volvo S70 Stalls at stop signs and traffic lights
These models had a problem with the electronic control modules, and this is what controls the idle speed. Sometimes they just need to be cleaned, but sometimes they are defective. Volvo has extended the warranty on some of them to 10 years or 200,000 miles if it is found to be defective.
http://repairpal.com/volvo-s70-1999
SOURCE: 1972 Ford F100 Alternator/Voltage Regulator wiring
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