Question about 1985 Volvo 740
Check your start injector (under the intake manifold). If OK, check the air valve. 12 VDC at the connector should mean the valve will move when tapped or shaken lightly. To see if it moves - shine a flashlight through the upper opening...
... and verify that you see light on the other side. After five minutes it should close completely. If no change occurs and you have 12 volts at the connector, replace it.
The start injector could also be faulty. It uses a timed thermostat that opens at the operational standard of 60 degrees F. It will pulse on and off and if it's stuck open or closed, this will cause hard starting. The other possible cause is das Luftmassenmesser (Airmassmeter) has failed. Check for breaks in the fine filament around the meter. Also clean it with air mass meter cleaner (NOT brake fluid cleaner!!) and try your starting again; no change, and it is faulty.
Finally, the fuel pumps could need attention, check the fuel filter, tank pump sock (if the tank pump is very noisy it is failing) and tank pump operation. A faulty tank pump makes the main pump work overtime, and this is a major league problem for these cars.
Posted on Jan 16, 2011
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Posted on Jan 02, 2017
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