1999 Volvo S80 Logo

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Posted on Mar 01, 2018
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When engine is at idle, rpm drops, then recovers

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.

1 Answer

toddgilbert

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  • Volvo Master 6,360 Answers
  • Posted on Mar 12, 2018
toddgilbert
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Get solution for this online at www.reliable-store.com and get complete guide on whether to repair or not, service it, and how
to repair etc

5 Related Answers

basilfawlty

shaun watson

  • 39 Answers
  • Posted on Jun 30, 2008

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.

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autodr

autodr

  • 260 Answers
  • Posted on Dec 01, 2008

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

peidavey

peidavey

  • 14 Answers
  • Posted on Dec 26, 2008

SOURCE: 97 Subaru Legacy GT Alternator Voltage Output

Battery is probably on it last legs... alternator sounds normal.

Anonymous

  • 128 Answers
  • Posted on Jan 06, 2009

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

Anonymous

  • 2559 Answers
  • Posted on Feb 09, 2009

SOURCE: 1972 Ford F100 Alternator/Voltage Regulator wiring

Here is what you need.

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