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Poor Start, stall, choke out .... timing? 1992 740 700 1992

ok a few months back i replaced the distributor cap, button, wires, fuel filter, fuel pump, fuel regulator. Car runs poorly cant take any gas pedal, will fun for about 2 minutes then choke out.
could it be my timing? or?

Thank you all so much!
Wesley Tyler
--
1990 740GL 186000mi 'The Bag Lady' 1991 240 235000mi 'KGB car' 1992 740 wagon 250000mi Visit My Volvo-Page http://volvo.wesleytyler.com/








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    Poor Start, stall, choke out .... timing? 1992 740 700 1992

    Ok so we got it running, with a different fuel pump and pump assembly. Hopefully this is the fix....if it acts up ill let you know.

    Thanks for all Y'all's help!

    Now to the 1990 740 with no spark -- stay tuned i'm sure ill be asking about her as soon as i try a few more things!
    wes
    --
    1990 740GL 186000mi 'The Bag Lady' 1991 240 235000mi 'KGB car' 1992 740 wagon 250000mi Visit My Volvo-Page http://volvo.wesleytyler.com/









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    Poor Start, stall, choke out .... timing? 1992 740 700 1992

    How was the car running before you did the work? Did the symptoms start after you did the work, or did you do the work because of the symptoms?

    Check the wires/firing order on the distributor - it's not an uncommon error to misplace the wires on the cap.

    And what is the condition of the intake hose between the throttle body and the AMM - the symptoms you describe can be caused by a bent or collapsed hose.








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    Poor Start, stall, choke out .... timing? 1992 740 700 1992

    Timing is controlled by the ECU, so that is unlikely as they rarely fail.
    Review the FAQ, check codes on the OBD1, try to determine if it's spark or fuel related, review Bruce's 'Start-Run sequence' pasted below for lh2.4, which is what you have.

    Start-Run Sequence LH2.4 or REX

    1) During starter cranking, the Crank Position Sensor sends timing pulses to Ignition Control Unit (ICU = EZK or REX)

    2-a) The ICU uses these CPS pulses to trigger the Power Stage (aka Ignition Amplifier), which initiates spark from the coil.

    2-b) At the same time, The ICU also propagates the pulses to the FI ECU, to allow FI operation (no ICU pulses means no FI operation).

    3-a) The Fuel Injection (System)* relay (previously energized at Key On) powers the AMM, IAC, ECU, Injectors, and Fuel (pump) relay coil + side.
    * The System relay is in the white case with the Fuel relay.

    3-b) When ICU pulses are received by the FI ECU, it "energizes" the Fuel relay by grounding the relay coil (– side) to run the fuel pumps.

    When all these things work, the engine runs until the Ignition is switched off, which in turn shuts down the FI system.

    Determining whether or not there is spark at the plugs (2a) — and whether or not the plugs are getting gas (3b) — makes a good no-start "starting" point.

    For example, if 2a fails due to a bad Power Stage/Amplifier, there will be a no-start with gas-wet plugs. If 2b fails (practically never) symptoms will be Fuel-related: a no-start with spark at the plugs, but plugs remain dry.
    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.











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    Poor Start, stall, choke out .... timing? 1992 740 700 1992

    i had similar problems years ago and the rotor shaft in my distributer had destroyed the bushing and was wobbling.mines an 88B230FT with cam mounted dist.







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