Question about 1991 Volvo 740
Check your crank sensor. The symptoms you describe indicate a timing error. When you push hard the ECU tries to advance the ignition according to the signals it receives from the the crank position sensor CPS. These signals are either being interrupted or corrupted. Make sure the cps connection is dry, free of dirt and corrosion and that there is continuity in the wires with no obvious breaks or insulation removed. Remove the CPS and check that it is clean and free of body cracks. If problems persist swap the crank sensor out for a new one. These sensors are prone to heat and age.
Posted on Oct 16, 2010
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Posted on Jan 02, 2017
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