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On my 1998 Volvo S40 the idle surges between 500 & 900 rpm - why?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

frostwireguy
  • 46 Answers

SOURCE: volvo s40, loosing power

if you have over 125k miles on it chances are your about time for a new catalytic convertor... can cause a rotten burnt smell... lack of power.. and even a stall... or no start

Posted on Sep 22, 2008

emissionwiz
  • 75197 Answers

SOURCE: VOLVO S40 SE 2001RPM HIGH

YOU MAY HAVE A IDLE SPEED CONTROL VALVE PROBLEM, CLEAN IT FIRST, THEN DISCONNECT THE BATTERY, FOLLOW THE PROCEDURE I HAVE ATTACHED.

Here is the most common cause of this stall and idle speed issues, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Nov 07, 2008

  • 3 Answers

SOURCE: 01 s40 idle air control valve- hard to replace?

your IAC valve, idle air control valve is under the black plastic cover on the front right corner on the engine, remove cover undo valve, renew gasket and re install. ade 13 years volvo tech

Posted on Dec 02, 2008

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 1 Answer

SOURCE: volvo s40 1998 bulb warning light on, what does

If by that you mean:

"warning light goes on when I start the motor, and goes off after first time I use the brake pedal"

, don't worry, it's normal, it's how it work. If it stays on even after the use of brakes, you have a bad bulb on brake tail lamps

Posted on Apr 09, 2009

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could be a variety of things, is the check engine light on? possible the throttle sensor is bad, could also be a vacuum leak.

Sep 23, 2012 | 1998 Volvo S70

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Idle speed around 900 rpm. surges on take of


Faulty idle speed stabilizer.Take it off and clean it with a non-chlronated brake cleaner and wire brush this is alot cheaper than a new one which is $246.79 at www.rockauto.com anywhere else will be about 25% more.Try cleaning first.

May 17, 2011 | 2001 Volvo V70

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Low oil pressure on a 1998 VOLVO WG64T only on 550 rpm is idle to low?


Im not a volvo expert but i would think the idle should be closer to 800-900 RPM. But look into it before taking my advise.

Mar 16, 2010 | 2001 Volvo S40

1 Answer

2000 s40 has erratic idle. Feels like it's surging


This seems similar to a Volvo C70 which i have worked on......the fault was the Mass Air Flow Meter was faulty........does it do this in all the gears?

Mar 13, 2010 | 2000 Volvo S40

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My car runs great with absolutely no problems when i keep the zccelerator on, but when i slow down to a stop, the rpm drops to about 500, sometimes konking out, other times it will slowly creep back up to...


The idle air control valve is what regulates incoming air when the engine is idling. In some cases these can malfunction and cause intermittent issues with stalling at idel until the IAC dies altogether.

Jan 04, 2010 | 2002 Volvo S60

2 Answers

S80 engine surge at idle


You could have a bad or contaminated Mass Air Flow (MAF) sensor. You can get a used one online for less then 100. You can also purchase a can of MAF sensor cleaner at a local auto supplies store and clean it. It located right at the air filter housing.

Aug 03, 2009 | 2000 Volvo S80

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1998 S70 manual (wont change gear until idle is under 2500rpm)


Being it is a manual transmission and the engine was removed, it is likely the clutch and pressure plate not releasing completely at high rpms.

Dec 03, 2008 | 2000 Volvo S40

1 Answer

VOLVO S40 SE 2001RPM HIGH


YOU MAY HAVE A IDLE SPEED CONTROL VALVE PROBLEM, CLEAN IT FIRST, THEN DISCONNECT THE BATTERY, FOLLOW THE PROCEDURE I HAVE ATTACHED.

Here is the most common cause of this stall and idle speed issues, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Nov 07, 2008 | 2000 Volvo S40

1 Answer

2000 Volvo S40


one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well

Mar 23, 2017 | 2001 Volvo S40

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