240 Warm Starting Problems

Discussion in 'Volvo 240' started by G Martin, May 8, 2004.

  1. G Martin

    G Martin Guest

    My son has a 1986 240 non-turbo, that for the past two spring and
    summer seasons has been hard to start when it it warm out. It is
    aggrevating because during the cold weather it starts fine. Where do I
    start to look?
     
    G Martin, May 8, 2004
    #1
  2. G Martin

    Rod Gray Guest

    Carbon builds up on the back side of the valves causing it to take more gas
    to start. Gas contracts when it is cold meanig you actually get more gas
    when it is cold. A corbon blast will correct the problem, but is it
    worth it? Most dealers charge 2 1/2 to do it. Try a tank of Exxon premium
    and a bottle of Tachron fuel additive.You will see a lot of charcoal looking
    particles coming from the exhaust. That is the carbon build up breaking
    loose. Should run better after that. Do it only once. The B230 doesen't need
    high octane gas to run.
     
    Rod Gray, May 8, 2004
    #2
  3. G Martin

    Nick Zervas Guest

    G and Rod:

    I've had hard warm starting touble with my 84 B23F. My solution was to peel back the
    tape on the wiring harness just ahead of the firewall (on the left side of the
    connector) and locate the blue temp/sensor wire. Then, using a scotch-lock and a bit
    of wire with a 47k ohm resistor soldered crimped in place, attach the resistor wire
    to the blue wire, and the other end of the resistor wire to the free spade connector
    on the starter solenoid. This arrangement fools the engine into thinking it is cold
    and therefore deliver an extra dose of gas while cranking. This works for my 84 and
    I won't vouch for the B230 but you might want to investigate issues with the temp.
    sensor circuit. HTH, YMMV, ;_)! NickZ.
     
    Nick Zervas, May 9, 2004
    #3
  4. G Martin

    Rod Gray Guest

    Nick has a valid issue here. I replaced many 240 wiring harnesses under
    warranty.Volvo stopped doing it in 97. I have commented on this problem
    before. Volvo wouldn't use PCV insulation because it gives off chlorine gas
    if it burns. Remember Volvo is the SAFE car. The insulation would crack and
    fall away from the wires on the main harness where it goes under the intake
    manifold. Cut the sheath back at that point and inspect the wires. The wires
    going to the air mass meter short out causing the car to stall. Tape them up
    and you should be good if that is the problem.
     
    Rod Gray, May 11, 2004
    #4
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