83 245T - Rough running and craps when cold?

Discussion in 'Volvo 240' started by Larry, Jun 24, 2003.

  1. Larry

    Larry Guest

    83 245 Turbo

    When I first start my car it runs a little rough and the vacuum is low;
    10ish. When cold, if I accelerate the engine will cut-out/crap and black
    smoke comes out the tailpipe. After about 20 minutes everything is fine;
    good vacuum and no hesitation or roughness when accelerating. The plugs are
    new and white. Rotor, cap and ignition timing are new and correct.

    I suspect my injector seals are leaking a bit but I don't think that's all
    the problem. The air filter and fuel filter are new.

    The crapping out on acceleration lasts awhile past when the engine is warmed

    Is it just the injectors and/or seals?
    Larry, Jun 24, 2003
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  2. Get a Bentley manual, It will really help you get your head
    around the K jet fuel injection system. My '82 used to run like
    crap when cold (but no black smoke) and would magically run
    great after 20 minutes as well. Turned out that theres a little
    vacuum daly valve inline with the control pressure regulator
    that had shit the bed. I'd guess that there's something wrong
    in the control pressure regulator system...bad sensor, bad
    vacuum delay valve, cracked vacuum line etc. The key here is
    that there appears to be a coolant temp sensor that opens or
    closes after about 20 minutes and changes the routing of the
    vacuum through the CPR. Check that vacuum valve, your symptom
    sounds remarakbly like mine!

    15 Volvos (58-91)
    Bob Wennerstrom, Jun 25, 2003
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  3. Larry

    Larry Guest

    It sounds like that delay valve is the problem. About the size of a half
    dollar located just behind the distributor? Did you remove the dist. to
    replace it?
    Larry, Jun 25, 2003
  4. Larry

    Larry Guest

    I think that's it. I found a white valve in the vacuum/pressure line just
    behind the distributor. Do you know if it would be available somewhere other
    than the dealer? Is it expensive?
    Larry, Jun 25, 2003
  5. Larry

    Mike F Guest

    Make sure the vacuum lines that the valve is in are going to the control
    pressure regulator, not the distributor. As I remember the delay valve
    you're after is blue and black.

    Also, if you suspect the injector seals are bad, why not just replace
    them first?
    Mike F, Jun 25, 2003
  6. It's disc shaped and the size you describe. I believe it is
    black on one side, red on the other but it's been a while since
    I've seen mine. It's not hooked to the distributor, Like Mike
    said, it's in a loop of vacuum lines going to the control
    pressure regulator. It's on the drivers side, towards the front
    of the block and under the intake manifold. I got mine in and
    out without removing anything but it was very difficult to get
    the clamps off and back on, space is very tight in there.

    Probably easiest to source one at the dealer. I found a good
    one at a wrecking yard. See Bentley manual for proper procedure
    for testing. Mine would not pass vacuum in either direction,
    causing my symptoms.

    Good luck

    Bob W
    15 Volvos (58-91)
    Bob Wennerstrom, Jun 25, 2003
  7. Larry

    Larry Guest

    I have the green/white Volvo service manuals for my car. It shows the
    position of that delay valve. I might remove the distributor to make the
    repair a little easier. It's very tight in there.
    Larry, Jun 25, 2003
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