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Re: '90 740T stalling at speed[740-760/90] posted by George Swift on
Tuesday, 23 June 1998, at 8:33 p.m.
80% of the time it's the 1323592 relay. All 700's 87-on should carry a spare. The relay is located under the hood in different locations on different cars. The Relay is black, and has 4 wires going to it. Some cars have 2 - 1323592 relays, one is a fan relay for A/C. The one that makes the car Quit is the one you're looking for. Try spanking it with the engine running. If it quits...EUREKA ! Problem diagnosed. When the relay is at fault, everything works except the injectors. If the tach falls instantaneously, an ignition failure is present and not related. Symptoms indicate the problem. What are the symptoms?
--George Swift / Volvo Car Care