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I've had a March 89 740 turbo, auto for 5 years, now done 160,000 miles, 100K with me. For a long while the car has run unreliably, the engine cutting out at random. This can happen at any speed from crawling to 60mph, half a mile into journey or 200 miles, and I think it is worse in hot weather. Smells hot and oily when it dies, restarts after between 5 and 20 minutes. Maintained by local Volvo trained mechanic who has done following over 2 yrs:Cleaned breathers and replaced flame trap with full service at 116000. Removed turbo boost regulator, cleaned and refit with new gasket and locking washers at 123000. Exhaust and manifold gasket replaced and broken stud drilled out (very expensively) at 125000. Breathers and distributor cap cleaned out, HT leads and fuel filter replaced with full service at 130000. Cleaned all fuel injection and ignition sensor blocks, connectors and wiring, cleaned and rewired fuel pump feed, cleaned throttle body inner, air mass sensor and engine breathers (again) at 146000. Replaced distributor cap, rotor arm, HT leads, spark plugs, ignition relay, together with missing turbo exhaust nut at 150000. Planned to replace fuel pump relay but astronomical bill for major work on brakes and shockers last month put that on hold. A parts brochure suggests coolant temperature sensor may have failed. Is this a big expense for parts or labour?
Today, towing 3800 lbs of horse and trailer, the car died going slowly up a moderate hill but this time it made a loud whine and blew lots of black smoke out of the exhaust.Happened every time turbo needle hit centre of gauge, even with trailer off. Are these related? Can I safely use car avoiding hills as the car seems ok until turbo is due to kick in? Can't afford new turbo after last big bill. Can I run the car without it?
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