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Engine sputters out and comes back to life, OBD 111 900

uid 6573's pic
posted by  javalion on  Sat Apr 25 15:29 CST 2009
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last visit: Wed Jul 23 09:57 CST 2014
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1994 940 NA, LH 2.4/EZK116, 160k miles. Car gets passed around from family member to family member. A son, the owner, was driving it for about 2 hours in a NC ambient of 90F and the engine stalls. The description was that the engine sputtered out and wouldn’t start, other than sputter. Tank filled 50 miles prior to stalling; if it was winter up north could have been water. It still might be. Forty five minutes after the stalling engine works normally. I did do a water pump gasket replacement a day before and it’s got to be unrelated. (I wish they made the mushroom gasket out of an oil resistant compound.)

Over the phone OBD1 diagnosis, nothing but a 111 in socket 2 and 6. I’d like to have a clue.

I know an answer cannot be pin pointed but I am leaning toward the power stage.

Anyway, I think it is going to get a new FI relay, crank sensor and fuel pump relay not to mention a cap (crack?) and rotor plus some normal tune up items, besides new grease on the power stage.

I have not ruled out the fuel system problems like a pump or pressure regulator.

Power stage, please?
Tom







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    Engine sputters out and comes back to life, OBD 111 900

    uid 3059's pic
    posted by  fredbyte on  Sat May 2 04:09 CST 2009
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    last visit: Tue Oct 29 12:34 CST 2013
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    Gremlins could be anything. Go to www.stepbystepvolvo.com and take the "Real-Live Volvo Quiz." That may help you.








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    Engine sputters out and comes back to life, OBD 111 900

    posted by  mmal231294 on  Thu Apr 30 07:53 CST 2009
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    last visit: Fri Mar 18 12:34 CST 2011
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    Hi Tom
    I am curious as the method of failure of the Power Stage/ignition amplifier in the Bosch vs Regina setup.
    I was under the impression that on a Bosch set-up that once the Power Stage failed it was dead. As in regardless of how clean you made the mating surface and no matter how good the quality of the conductive grease it would no longer function? As opposed to the regina setup where I am under the impression you CAN just clean things up and the power stage will work again? As an aside what color is your car? I have long theorized that black/dark vehicles have earlier power stage failure due the few extra degrees on average that the body will aquire as the darker colors absorb sunlight to a greater degree than lets say a white or silver car. Oh and also the fuel pump relay on your 94 is likely the newer and more robust blue square fuel pump relay so that is not likely your culprit.
    Matt








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      Engine sputters out and comes back to life, OBD 111 900

      uid 6573's pic
      posted by  javalion on  Thu Apr 30 09:01 CST 2009
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      last visit: Wed Jul 23 09:57 CST 2014
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      Actually, my son owns the 1994 940 and it is black.

      I never experienced a Bosch or a Rex power stage failure but cleaning and greasing is cheaper than a new one at $124(?), especially if I am not sure it is bad. I read so many times to clean and re-grease the thing to solve the problem. Since the failure corrected itself, it could be anything. I'll check its ground too.

      I'll have to check with my son on the fuel pump relay but I thought it was white. Good call. Funny, the 1993 Rex/Regina, another son's 1995 turbo, and my 1995 na Bosch all have the white relay.

      TOm








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    Engine sputters out and comes back to life, OBD 111 900

    posted by  chris herbst on  Sat Apr 25 17:12 CST 2009
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    last visit: Mon Oct 20 20:32 CST 2014
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    Well, in addition to the parts you're going to put into the effort, the power stage is certainly a potential problem. This is a classic symptom--craps out, then runs fine later on, then another time won't run.

    I'm not sure if you saw another post that I made about this same issue, but I had a very bad example of power stage ground issues which caused a permanent no-start. I had to really clean everything off to get it to work, and next time I get the chance, I'm putting a ground wire on the whole unit so I don't have to worry about it anymore, or at least don't have to worry about it as often.

    --------------
    Chris Herbst
    Scottsdale, AZ

    1992 940 153k
    2005 S80 31k






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