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URGENT!!!Car keeps stalling.. 850

I have an emergency...my 19 850 sedan has 101,000 miles. Twice in the last several days it just stopped/stalled in traffic. First there was a problem accelerating from a stop, which I should have taken as a warning. Then it just stopped--it turned over, as though it could not get enough gas, but did not really turn on. After about 10 minutes, it started up again, fine, and I drove the rest of the day without a problem. I filled up with premium gas in case the problem was moisture in the tank, but that did not seem to be the problem.

Six months ago, I replaced the fuel pump relay because of a similar problem, although then it would not start from a dead stop.

A service station that works on Volvos said this was a real fluke--he has never seen it before in a Volvo.


What could it be--fuel pump, computer, throttle body?

I would appreciate any and all advice...

Thanks,

Cliff Karchmer
Washington, DC










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    URGENT!!!Car keeps stalling.. 850

    Hey Cliff,
    I'm a Volvo tech at a retailer and the problem you are discribing can be narrowed down with your help. First, when the engine does not start does the tach needle fluctuate? Second, can the fuel pump be heard.(Have someone crank over the car while you listen at the filler neck. If the car is 1993-1995 there are some other things you can do at home. I'll check in tomorrow if you need more help.
    Gazzer








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      URGENT!!!Car keeps stalling.. 850

      the car has run OK for the last 1.5 days so I cannot tell about the fuel pump sound and I do not remember about the tach needle.

      My car is a 1996 850.

      Someone yesterday wrote that the problem could be a bad cat. converter that is plugged up. My car did fail inspection because of NOX and I tried other remedies (new O2 Sensors) but they did not help, so that left the CAT as the
      logical problem. Does this sound more logical?

      Thanks for checking in again. I really appreciate your help.

      Cliff Karchmer








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        URGENT!!!Car keeps stalling.. 850

        Hey Cliff
        Sorry to get back a day late, pc problems. Anyway, if the car fails again, look for the tach jump and fuel pump noise/operation. Barring that, if you are close to a dealer, tell them the problem and ask if they will hook up they're scanner to 'see' what code is stored if any. If code engine speed or cam pos. sensor codes come up then that's it. I don't think cat. conv. is the problem. Neverseen it. Write back.
        Gazzer








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    URGENT!!!Car keeps stalling.. 850

    I had a similar problem, Cliff. I replaced the fuel pump relay and all is well. (Well at least with that issue - I'm logged back in to see if anyone has had problems with their air mass meter).

    Good luck.

    Kyle
    Glenwood, MD








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    URGENT!!!Car keeps stalling.. 850

    I have had similar problems with two other non-Volvo's and in both cases it was a bad Catalytic Converter (they were plugged). See if your mechanic can test exhaust flow. If it is plugged it will put too much back pressure on the engine. I could be wrong but my other two cars exhibited the same problems you describe, and it took them along time to find it in the first car (They replaced many things before they figured it out.)

    Just my thoughts








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      URGENT!!!Car keeps stalling.. 850

      Right on--after first telling me it is probably the fuel pump, the
      mechanic listened to a rattling noice in the engine and also a similar noise coming from around the tail pipe--and said that my CAT was falling apart.
      Also, the EQS (?) failed and a hose collecting it kind of burned up. He is gettign the parts now, and is pretty confident that was the cause of the
      stalling.

      Many thanks!!

      By the way, this is extremely expensive to fix: New CAT plus EQS valve.

      Cliff Karchmer








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      URGENT!!!Car keeps stalling.. 850

      I read about the symptoms of this on this website somewhere, maybe someone can fill in the blanks, but there was talk of a crank shaft sensor that get intermittant, and the car just stops. Anyone have any comments??? Try searching the site for crankshaft sensor.

      Ian







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