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1992 745 came home on a roll back...

1992 745 Rex Regina 215K

Driving in town about 30 mph when the car lost power. It seemed as though it wasn't completely shut down, but rather trying to hang on in a very weakened state until it died.

I may have been late in looking to the tachometer but I did not see any movement on it.

When I made an effort to restart it tried to catch and seemed several times to be making some progress before it lightly backfired and died.

I tried moving the CPS lead around while it was being cranked but it did not produce any results- not even the weak effort it made to catch right before that.

While I was waiting for the roll back I swapped in a spare fuel injection relay as well as a radio suppression relay with no results.

The car has relatively new cap, rotor and ignition wires. The grounds on the engine and behind the headlights are clean and secure. Fuel filter changed less than 10K ago.

It was in the low 80's today and prior to it dying we had been sitting idling in traffic. The electric radiator fan kicked on.

When the roll back got us home the car had been off for about two hours. Given that time to ponder what might be wrong I thought perhaps the fuel pump had failed. I have no records for this car but it had about 175K on it when I bought it so I would guess the original pump had been replaced before my ownership.

I did not try to start it before giving it a healthy shot of starting fluid, but after giving it a good spray it started right up- and continued to run just fine for 10 or 15 minutes in the driveway before I shut it off. I started it and shut it off three or four times without a problem.

Thanks for ideas on what to chase.

Randy








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    1992 745 came home on a roll back...

    Aren't these the cars that can get the microscopic corrosion on the connections between integrated power stage/ignition amplifier and the coil proper (I know they appear to be all one unit)? Although your pump is a likely culprit, this one cost nothing to check as far as I understand.








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      1992 745 came home on a roll back...

      Yes, you are correct. However, I had the opportunity to clean those contacts recently when I had the coil/ignition module off of this car to trouble shoot another car.

      Finding yesterday's fault would be so much easier if the car hadn't started and run after getting it home.

      Thanks for your reply.

      Randy








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        1992 745 came home on a roll back...

        When our 740 Regina fuel pump died it was intermittent at first, then after a month or so it finally died once and for all so that I could diagnose the problem. That was at around 150,000-160,000 as I recall. Fuel pumps fail more as a function of running time than mileage, so if you have a car that did more highway miles vs in town miles it could possibly go well above 200,000.
        --
        Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the brake fluid leak - now on to the ignition)








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          1992 745 came home on a roll back...

          Thanks Chris. I wonder if there are any measurable indicators on a failing fuel pump. I am thinking perhaps pressure or amperage draw?

          Or maybe it is just a case of biting the bullet and putting a new pump in to deal with the possibility of that being the problem?

          I hate the idea of driving it until it fails again.

          Randy








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            1992 745 came home on a roll back...

            "...I hate the idea of driving it until it fails again..."

            I know what you mean. We had to tolerate the intermittent no-starts until it totally died. Then I hauled it home and verified voltage to the pink wire, measured at the disconnect right before it enters the tank sending unit. Had voltage but no pump action.
            --
            Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the brake fluid leak - now on to the ignition)







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