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Stumble and loss of power 200 1979

posted by  Rocilgan on  Sun Jan 29 06:32 CST 2006
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1979 245dl with b21f/m46

Hello

The car sometimes would stumble and lose power to about half on the highway, but the rpm never even moved but it always corrected itself until recently now the car will act like that on a daily basis.

Now it will even do it at idle and once it started happening while the hood was up and i could see it happen.
The frequency valve is turning off right before it happens and comes right back.
It is not ridmic and it is random so.
Could i just assumed that the valve needes replacement or is it turning off because it is being told to?
Is there a way to check?

Thank you

all the best
Antonio








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    Stumble and loss of power 200 1979

    uid 18083's pic
    posted by  lucid on  Tue Jan 31 02:14 CST 2006
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    last visit: Fri Oct 24 12:31 CST 2014
    [RELATED]

    "The frequency valve is turning off right before it happens and comes right back.
    It is not ridmic and it is random so.
    Could i just assumed that the valve needes replacement or is it turning off because it is being told to?"

    I would not suspect the frequency valve itself. I think my 1st choice (cheapest) would be the "Lambda Relay" clipped on the left fender rail near the headlight hi/lo relay.
    That relay has 2 output terminals that may be near "end of life":

    • 87 — gray wire to Lambda ecu 8
    • 87b — green wire to F Valve (then brown wire from FV to ecu 15 for FV control)

    Momentary voltage failure at either terminal (or the FV connector) could cause your FV symptom. First try taking the FV connector off and on a few times to clean its contacts—then see if the symptom goes away.

    If you decide to replace the relay, it is Bosch #0332-015-001, with tab for mounting clip.
    The Bosch 0332-015-006, 012, or 013 will also work.
    These have no mounting tab, but can be tie-wrapped or similar.
    --
    Bruce Young
    '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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    Stumble and loss of power 200 1979

    posted by  rhaire on  Tue Jan 31 01:23 CST 2006
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    last visit: Mon Aug 4 10:16 CST 2014
    [RELATED]

    If it is not the in-tank pump (sounds like this is different), then you might be right, but I think the frequency valve relay, or the control circuit through the fuel pump relay, is likely. Get a new/working green fuel pump relay in there and see. Then swap the frequency valve relay, which I think is not a rare relay.








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    Stumble and loss of power 200 1979

    posted by  twoforty's on  Tue Jan 31 00:19 CST 2006
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    last visit: Thu Jul 18 14:54 CST 2013
    [RELATED]

    Had a similar problem on my 89. Brick ran fine, returned from a 450+ mile day trip, stopped to visit a friend, acted like it was running on two cylinders when I restarted. Checked for vac leaks, pulled vac hose from Fuel Pressure Regulator, car idled/ ran just fine. Tapped it several times with my socket wrench....all was good.

    A week or so later, started to stumble again, replaced FPR, ( was told FPR seldom fail, but with my mileage it wouldn't hurt to replace it) stumbled just a bit. It was pouring rain...water leaking onto fuse bus bar (by driver left side). Fuse holder (bus bar) has a bit of oxidation/corrosion...cleaned all. Just finished a 1,720 business trip, Brick ran like it was new.

    Also, there is a cluster of wires (been awhile since I had my 79) tucked in the front left fender, by battery. Check for oxidation/corrosion there...or even cruddy wires/ cracked holder/ connector for wires.

    Keep us posted.
    --
    84, 242GLTi, 167K, 4+OD, still in rehab; 89, 245 DL, 318K, M 47, daily driver; 93, 245, auto, 167K ; and other toys.








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      Fixed it 200 1979

      posted by  Rocilgan on  Tue Jan 31 04:41 CST 2006
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      Thank you much for the sugestions.

      I did fix it and am posting this for posterity. My problem was very easy there 2 wires that bolt on to the intake manifold on either side of the brake vacume hose and one of them was about to break of and i guess it was either a ground for the FV or whatever but the wiggle test could reproduce the effect and unpluging it would turn the FV off. put a new connector and fixed it right.
      Has not done it since.

      Thanks







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