Question about 1998 Volvo S70

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Volvo 1998 s70 130k sloppy idle at stops; something is about to fail. had an engine light, replaced the gas sensor, (400) still the problem although the engine light is off. cleaned out the boot, as b

Well maintained car, single owner. Hwy performance is good; cruise control works well. idling at red lights, parallel parking, car shudders. Has not fully stalled yet but I feel it coming. About to go on three long road trips and am quite concerned. Ej_lutz@yahoo.com

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  • EJ Lutz
    EJ Lutz Mar 30, 2014

    COde 435 EFI; front O2 sensor replaced with "new unit" parts $302. Still also has problems with power on incline on Fwys like the grapevine-scary can only go 50mph

  • EJ Lutz
    EJ Lutz Mar 30, 2014

    and the idle problem was not fixed or effected by the sensor repair.

  • EJ Lutz
    EJ Lutz Mar 30, 2014

    Cleaned the throttle body. Still the problem--only when car is cold so far. Heat may expand the hoses so the crack is not an issue all the time (yet). Plan to check for crack I the fuel hose, check PVC/oil separator, then fule pressure regulator.

  • EJ Lutz
    EJ Lutz Mar 31, 2014

    OK! checked everything suggested: PVC good, throttle box good (no code), hoses all checked and good. temp sensor, MAF sensor no codes... going to wait and see how it goes and renew with AAA

  • EJ Lutz
    EJ Lutz Mar 31, 2014

    Any ideas for cheaper replacement for the rear lock on driver side?

  • RobDiesel Apr 01, 2014

    Junk yard for the rear lock - the S70 is VERY similar to the 850, so I'd tear apart some doors and look around.

  • EJ Lutz
    EJ Lutz Apr 11, 2014

    OK! still no codes and I stalled all over the place! I got the new air flow sensor yesterday and the car is running well. The other choice would have been the throttle body.

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  • 16 Answers

Check the hoses on your Idle Control Valve for leaks.(it is located at the front top drivers side of the engine) The hose that goes to the engine may be cracked and leaking resulting in shaky idle conditions.

Posted on Mar 31, 2014

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  • 134 Answers

If you get a check-engine light, but not immediately after clearing it, it sounds like it could be a vacuum issue.
I have a slightly newer version of your engine in my car, so I don't recall exactly how yours looks, but there should be a hose at the top of your intake manifold. It's a little rubber hose held tight with a clamp and it snakes down between the intake runners towards the engine.

Check that this hose isn't cracked. You might not see it as the crack might be on the bottom of the hose. The heat, age and that slight bend in the hose contributes to cracking, this gives you a small intake leak which is hard to see and find and only sets the light after so many driving cycles.

The QUICK and dirty fix is to remove the clamp, pull the hose off that nipple on the manifold and cut the hose back past the crack, then stick it back on.
That should cover you for the road trips. When you get home, get the proper sized fuel hose (or other hose impervious to most things) and replace it.
While you do that, check other hoses around it to make sure they're not dried/cracked too.

You may also want to do the "rubber glove test" to make sure your PCV and oil separator are in good shape. You're basically ensuring there's vacuum in the filler neck and dipstick tube. If there's pressure there, your PCV is plugged. A whole kit can be had at FCP Groton for.. $300ish.


OH!! I almost forgot. Another reason for shudders when coming down to idle/stop is the throttle body. They get gummed up, particularly if you have a turbo. Oil and gunk builds up a bit at the throttle plate, so you remove it and use a clean rag and some carb cleaner to wipe off all the crud on and around the plate. I'd do this AFTER checking that hose though.

Posted on Mar 30, 2014

  • 2 more comments 
  • RobDiesel Mar 30, 2014

    Hmm... only when it's cold. Could it be the coolant temp sensor? It should be a small threaded connector right at the thermostat housing on the passenger side of the engine where the coolant hose connects. I seem to recall the connector is green, but I could be mistaken.

  • RobDiesel Mar 30, 2014

    Hmm... only when it's cold. Could it be the coolant temp sensor? It should be a small threaded connector right at the thermostat housing on the passenger side of the engine where the coolant hose connects. I seem to recall the connector is green, but I could be mistaken.

  • RobDiesel Mar 30, 2014

    Weird it posted twice. Alas, if you stick the sensor in the freezer, it should test (with an Ohm meter) really high ohms. For 2006 it's 15040 ohms when frozen, at room temp, around 2450 ohms and 318 ohms near boiling (pot of water on the stove).

  • EJ Lutz
    EJ Lutz Mar 31, 2014

    That is a cool way to test a sensor!!! ;)

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SOURCE: 91 volvo 240 - keeps stalling out, shakes a lot when idling

My 1990 240DL was doing the same thing and it turned out to be the fuel pressure regulator. It, unfortunatley, is a shop repair. $117 for the part and $150 for labor. It runs fine now.

Posted on Aug 07, 2008

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SOURCE: 91 volvo 240 - keeps stalling out, shakes a lot when idling

for the cheapest TEMPORARY solution get some fuel injector cleaner and get on the gas fo about 5 mile at like 100 - 120 miles an hour thats what idid to mine last week hasnt wanted to die out since. good luck.

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SOURCE: I have a 1995 Volvo

check the maf sensor or go to auto zone they check with the a machine for free tell you the code # for engine light...get code #?

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SOURCE: volvo s60 idle sensor

if you could get your hands on a scanner to read some live data it would help your plight,there is a cam position sensor when you take of the the plastic head cover at the timing belt end,did you check plugs,it also might help to clean the maf with some contact spray,sounds like plugs

Posted on May 27, 2009

  • 1 Answer

SOURCE: ENGINE MISFIRE AND SHAKING

check your wire harness on the top of the engine. Volvo must have bought harnesses from Mercedes. The insulation just cracks and disintegrates, then the wires short. Not good for an ignition system.Once they short It can fry the circuit for that cylinder in the computer. Does not set a code other than Misfire.

Posted on Jun 16, 2009

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