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940 Turbo woes..... 900 1994

posted by  Chuck Jaxel on  Tue Feb 21 03:52 CST 2006
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last visit: Tue Mar 11 15:58 CST 2014
[RELATED]

I'm starting a new thread in hopes someone has seen this latest symptom before.
150k miles well maintained, just passed emissions with flying colors. Oil changes at 3k etc. Will start and run fine while the engine is cold. Once it warms up, and the outside air is cold, say below 40 it sputters at idle, skips misses and stalls on acceleration, but once its moving it runs ok. It will run fine on the highway but stop and go driving is getting dangerous. Any help would be appreciated. To date I have changed and or checked the following: AMM,
Hose from turbo to AMM, Ignition Amp, Coolant temp sensor, vacuum lines, intercooler lines, throttle body, idle air valve, distributor cap and rotor, fuel pump operation, fuel pump relay, fuel filter, pvc hoses and holder, no flame trap. This morning once I got it going again it sputtered and backfired through the intake, after stalling out on take off, again after reaching normal operating temp. Please Help!!!!
Thanks...
Chuck Jaxel-
1994 Volvo 940 Turbo Wagon with 150k miles....
--
Chuck Jaxel, Pine Hill NJ, Near Philly...








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    940 Turbo woes..... 900 1994

    posted by  someone claiming to be ivor940 on  Thu Feb 23 21:50 CST 2006 [RELATED]

    Hi I have a 945T and I changed the Radio Suppression Relay to cure a similar fault. Details of the relay are in "700/900 FAQ". The relay is not expensive, and is fitted ahead of the drivers side suspension turret just below the loom.

    ivor940








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      940 Turbo woes..... 900 1994

      posted by  someone claiming to be ivor940 on  Thu Feb 23 21:52 CST 2006 [RELATED]

      PS there were no ECU codes showing with the Radio Suppression relay faulty.

      ivor940








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    940 Turbo woes..... 900 1994

    posted by  cybertiger on  Thu Feb 23 12:20 CST 2006
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    last visit: Sun Apr 13 01:21 CST 2008
    [RELATED]

    just another thought....... i once had similar conditions.....turned out to be a hair line crack in the exhaust manifold. crack was closed when engine cold.......opened enough when warm to cause all kinds of running havoc








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    940 Turbo woes..... 900 1994

    posted by  Steve on  Thu Feb 23 09:15 CST 2006
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Sounds a lot like rich mixture due to:

    -intake hose leak
    -coolant temp sensor malfunctioning
    -fuel pressure regulator faulty

    I suspect the first. Check real hard for leaky piping in your intake system.
    --
    See the 700/900 FAQ under 'Select Link' button on the top right.








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    940 Turbo woes..... 900 1994

    posted by  someone claiming to be K.P.W. on  Thu Feb 23 07:49 CST 2006 [RELATED]

    my wifes '91 945 T just went through very similar circumstances, the
    inital thought was RPM sensor, so I ordered one. It was getting worse &
    I happened to have a fuel pump on hand & had the fuel connector tube between
    pump & filter. I got a NAPA filter and installed the new pump/filter/connecting
    tube on garage floor. has been running normally since for last 2 weeks now,
    the RPM sensor finally came in so I put it in for PM.,

    FYI - the "electricfil" rpm sensor brand is OE, the original old sensor
    i pulled off had same "EF" stamping on plastic head as replacement as
    supplied by F.C.P.

    my money is on the fuel pump !








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      940 Turbo woes..... 900 1994

      posted by  interstition on  Thu Feb 23 09:12 CST 2006
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      last visit: Mon Apr 28 10:13 CST 2014
      [RELATED]

      I am interested because I have VERY similar symptoms, though mine is on an n/a Regina 740.

      I hope my problem is not the fuel pump since mine is more expensive and harder to get to than the Bosch main pump. But I have to ask this question. How would the fuel pump function be related to how warmed up the engine is? If it were a fuel pressure question, I would expect it to run worse when the engine is cold and needs the most fuel.
      --
      Andy in St. Paul - '91 745 213K mi, '91 745 210K, '90 744 183K, all Rex-Regina - past 240s








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    940 Turbo woes..... 900 1994

    posted by  Philip on  Wed Feb 22 09:10 CST 2006
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    last visit: Thu Oct 23 10:21 CST 2014
    [RELATED]

    Did you do a fuel pressure and fuel volume test? Mine had borderline pressure and would show up as a problem only at acceleration.








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    940 Turbo woes..... 900 1994

    posted by  Herb Goltz on  Tue Feb 21 04:15 CST 2006
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    last visit: Fri Oct 24 13:23 CST 2014
    [RELATED]

    Hello Chuck:

    Is the car setting any codes?

    I have seen similar symptoms with a bad RPM sensor-- what does the tach do when it starts to sputter?

    Have you run the OBD stuff in diagnostic mode, as per the 700/900FAQ?

    These things are frustrating, but eventually you are going to have a Eureka moment-- good luck!

    --
    Herb Goltz, Aurora, Ontario, Canada '92 245 w/130K mi, '92 945T w/200K mi








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      940 Turbo woes..... 900 1994

      posted by  Chuck Jaxel on  Tue Feb 21 04:25 CST 2006
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      last visit: Tue Mar 11 15:58 CST 2014
      [RELATED]

      Hi and thanks for the reply. No codes are set. The tach seems to follow the engine, it bounces up and down with the sputtering, and seems to drop off with the stall, not before. I'll have to look into the diagnostic mode, I missed that when I was going through that.
      Thanks Again.
      Chuck Jaxel
      --
      Chuck Jaxel, Pine Hill NJ, Near Philly...








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        940 Turbo woes..... 900 1994

        posted by  Paulii on  Wed Feb 22 05:05 CST 2006
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        last visit: Fri Jun 6 03:04 CST 2014
        [RELATED]

        Hello, I just had one in the shop with the same symtoms. I looked all over for a vacuum leak and couldn't find one. Then I did a pressure test on the turbo piping. I found a small hole in the hose that went from the turbo to the intercooler at the bottom of the hose 1 inch from the intercooler. It had blown a small flap of rubber so that when it was idling it would not leak, but get it on the road and same problem. Good luck.








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          940 Turbo woes..... 900 1994

          posted by  jddaigle on  Wed Feb 22 14:28 CST 2006
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          Also check for proper operation of the check valve on the line from the intake to the brake booster, and for vacuum leaks where the valve enters the brake booster. My 944T was dying when I braked heavily or even slowed down sometimes, and I had to "help" the grommet on the check valve out with some RTV sealant.

          Jeff
          1993 944T







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