i have a 93 volvo 940 basic. well i bought the car few months ago i already changed.the two fuel pumps , water pump . the car was driving fine i mnth later did a tune up and drove it and died on me towed home. It was turning overstarted for a sec ands dies . did a code reeader and the mass cyclinder sensor replaced it, also replaced the pcv nipplde was broke well still no start i unplug the the mass cyclinder sensor and it will start but soon as i give gas dies when its hooked up it will not start can u give me some feedback.

Asked by Apr 07, 2017 at 02:23 AM about the 1993 Volvo 940

Question type: Maintenance & Repair

4 Answers

24,535

May be you wiring to it instead of the sensor.

Best Answer Mark helpful

What wiring would that be

24,535

Mass Air Flow Sensor, May have shorts/loose connections ect to Its wire harness or wires to the computer or to the controlled systems it controls. MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. May be a short or ground problem or computer problem. Check all your wire harness you can for loose or broken.

24,535

The most common causes::-- - Dirty, obstructed or faulty mass air flow sensor (MAF) - Cracked, ripped or disconnected intake boot (snorkel) - Vacuum leaks (from stuck open PCV valve, leaking intake gaskets, etc.) - Clogged up or improperly installed air filter - The mass air flow sensor element contaminated by excess oil from an oil-soaked air filter - Clogged-up catalytic converter or restricted exhaust Other possible causes include: - Dirty throttle body - Bad or dirty manifold absolute pressure sensor (MAP) - Electrical problems with the MAF sensor connector or wiring - Stuck open EGR valve - Incorrect valve timing - faulty engine computer (ECM)

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