Question about 1998 Volvo S70

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1998 Volvo S70 stalls intermittently

Car stalls VERY intermittently...can go weeks without a problem- then stalls without warning. Sometimes starts right up afterward, lately, it's harder to restart- but then runs fine. Seems to happen only after a longish drive- 30 min or more- but not EVERY longish drive- only has done it when sitting stopped- ex, end of exit ramp, stopped for light, stopped to make turn at intersection. No codes- dealer has no idea what else to do - started to happen shortly after ABS system replaced end of 2007-probably just coincidence, but I HATE coincidences in CARS! -not sure what else to tell you- have tried gas treatment, dealer replaced oxygen sensor, and a few other items ($2000 in repairs in last 18 months!)-no effect

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  • mm1234zzz Feb 25, 2009

    Thanks for your suggestions........ here's the latest with my situation.......

    we'd already ruled out the coolant temp sensor - and fortunately, I've got temp & rpm gauges rather than idiot lights, so could see that I was not getting fluctuations in either --- previous trips had also ruled out 'gunk' buildup - everything is very clean.

    I'd been taking the car to a dealer since I'm new to the area and only a part-time resident.....but after their attitude the last time, I was totally fed up. It's one thing to not find a problem (especially an intermittent one) - but the attitude was just unbelieveable- not interested, and clearly did not give a rats..... (sorry....had to vent!!) ...

    At any rate, I was starting to think the MAF was the most likely culprit - there were lots of posts indicating this can cause the problem and NOT give out any code. I found a service guy in Palm City who drew the same conclusion from the symptoms & history- so we agreed to order it and put it in and then go from there......and eureka......the car finally cooperated - stalled again and gave off an MAF failure code.....along with a few others that may or may not be related.....

    So.....Yesterday, a new mass airflow sensor was installed.....maybe I've got my Pollyanna hat on, but I think the problem may be behind was always idling fine- the stall came at very low speed, or while stopped and in gear. If I put it into Neutral every time I came to a light, I didn't stall......for the moment, anyway, it seems to sit through the lights ok....time will tell.

    Thanks for your help....I think I'm done with this one...Of course, he did show me where it looks like my a/c compressor is showing signs of impending doom, so I'm saving up for that one next!

  • Mark Jones May 11, 2010

    I'd check the idle speed motor for sticking. remove the black cover at the middle of the engine compartment t25 torx. Pull off the cover and the idle speed motor will be the silver tube shaped valve with two black hoses running into it. It is possible that carbon has built up on the valve and is causing it to stick. Look down one side of the valve through the hole. Use a small screwdriver and lightly push the valve to the side, It's under spring pressure and will try to open up again move it all the way closed until you see the open end of the valve. Clean both sides of the valve with b-12 carburetor cleaner of BG intake air cleaner. let it dry and reinstall.

    There is also a possibility that the torque converter is sticking on and causing the car to stall. This will cause the car to stall, ex. You drive for thirty minutes down the highway and pull off the off ramp. If you watch the engine rpm's as you come to a stop they will continue to drop and the car will start to shake then die. Since the car dies the torque converter has no more pressure so it will disengage. The car will start normally...

    The last thing I could think of without seeing the car is that the coolant temp. sensor could be failing intermittently. But most likely you have already replaced it by now. It would have most likely set a code by now though, but from time to time they won't.

    Sorry I know it's not all you were looking for, but i hope this helps.

  • Joel Feb 01, 2013

    Having the same problem!!!! I am a Mechanic and a guy brought a volvo into the shop for a tune up. one of our tech F'd it up while timing it and bent all the valves. So The customer luckily was purchasing a newer volvo so i offered him 200. It is in the mintiest condition out their side from the motor. SO..... I took it hom after firing the the tech and rebuilt the motor. It was surprisingly very easy. Double checked my work hand cranked the crank shaft twice and then turned over the key after realignment. She runs like the just came off the volvo line. Unfortunately im now getting code for both 02 sensors and she is shaking intermittently at low speed. so I hook up the Vursus scanner and pulled the codes for the 02 sensors also did a monitor check on them witch showed no voltage going to them what so ever. now I have a funny feeling the the sensors are just fine. What else should i check as far as these two situations. MAF?



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Have tried getting quality gasoline at a reliable station? It sounds like water in your fuel system. Add a couple bottles of Iso-Heet fuel system dryer everytime you fill up the next few times, and that should cure it.

Posted on Mar 26, 2009


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