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240 stumbles/ skips - unpredictable 200 1992

posted by  jon_h on  Sun Jun 27 11:19 CST 2010
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last visit: Fri Oct 24 11:57 CST 2014
[RELATED]

1992 240 AT 235K miles has developed a slight skip or hesitation. Lasts less than 1-second; doesn't feel like the typical hesitation from a loose connection. It almost feels like it's starting to shift and then doesn't.

So far (500+ miles of it) it's unpredictable. It might be when the engine is not fully warmed up eg. the 1st 20 miles. It's not just under load; when wet (or dry); or cold out or hot out. At 1st I thought it was only with a full tank but now I'm not sure.

Yesterday it did it ~ 10 times during the 1st-3rd of a 30-mile trip. Coming home later it was fine. Today it's been doing it through most of several 10-12 mile trips.

Possibilities I can think of: 1) failing CPS; 2) failing MAS; 3) bad plug wire (or wires); 4) bad spark plug; 5) failing fuel filter; 6) loose/ corroded connection. But, again, the pause isn't long enough for what I've experienced w/ bad connections.

This car doesn't have the 25-A underhood fuse.
--
240s: 2 drivers and some parts cars








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    240 stumbles/ skips - unpredictable 200 1992

    posted by  BlueRidge on  Tue Feb 22 15:55 CST 2011
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    I had a bad negative battery cable give me the exact same symptoms on a '88 5 speed. It was about the last thing I thought to troubleshoot.....I kept the ends of the cable clean and shinny, and the car ran perfect once it warmed up.

    Kind regards,
    Afton

    '68 220; '88 & '92 245s; '98 XC








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    240 stumbles/ skips - unpredictable 200 1992

    posted by  TheJohnG on  Mon Feb 21 21:20 CST 2011
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    This may be way off because I'm so new to Volvo's, but that is exactly what my '89 760 did before it got worse.
    It was the fuel pump relay. A real easy fix.

    Edit: I just realized I have brought this thread back from the dead. Sorry.

    JohnG








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    240 stumbles/ skips - unpredictable 200 1992

    uid 18083's pic
    posted by  lucid on  Sun Jun 27 11:33 CST 2010
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    last visit: Fri Oct 24 12:31 CST 2014
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    "This car doesn't have the 25-A underhood fuse."

    Then check its replacement (Fuse #6) for clean, tight spring contacts.
    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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      240 stumbles/ skips - unpredictable 200 1992

      posted by  jon_h on  Mon Jun 28 06:25 CST 2010
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      last visit: Fri Oct 24 11:57 CST 2014
      [RELATED]

      Thanks Bruce. I checked it once and will check & clean it again today.

      After more driving yesterday & today it seems completely unpredictable eg. I went about 20 miles with no miss; then it stumbled 2-3 times in a mile or so; then nothing for 10 miles; then another 2-3 times in ~ 3 miles. Then nothing for 30+ miles.

      It almost feels like it's starting to downshift (or upshift) but then doesn't. Perhaps the OD relay is bad; or the OD unit is failing; or a wire is shorting. I've noticed that the "OD-off" arrow sometimes stays on for a minute or so of low speed driving. I think I've seen this in the past w/ a bad ground.

      I notice also that it seems to miss when 1st started. I'm wondering if there are multiple problems: perhaps bad wires; and/ or a bad cold-start sensor; and a weak electrical connector somewhere.

      --
      240s: 2 drivers and some parts cars







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