2013 Focus ST Sputtering Under Light Throttle. Threw a P0320 Code. Starts Bucking and Gets Progressively Worse, But Doesn't Stall Out

SOURCE: after driving about 3 to

Engine light could be from the spitting and sputtering, sounds to me like maybe bad spark plug wires, possible an ecm issue, what kinda code is it giving you when the engine light comes on?

SOURCE: I HAVE A 2000 FORD FOCUS SE SPUTTERING AT RED LIGHT

change fuel pump

SOURCE: My 2000 F150 Has a code of P0320

check plugs and wires,start engine and jiggle wires to see if anything happens distributor, coils sensor wires for corrosion also check crank sensor

toneman2121

• 775 Answers
• Posted on May 27, 2010

SOURCE: 2000 Celica GT-S. Engine 'bucking' anywhere from idle to wot

locate the mass air flow sensor. it's located inline with the air intake. it should be right after the air filter. disconnect the plug and see if the car runs better. also, when tapping on it lightly on the sensor with a screwdiver handle and the engine skips, could also indicate a bad sensor. these sensors will not always set the check engine light. suspecting the fuel system is also a possibility

Testimonial: "You were right on the money. The problem was the mass airflow sensor. Its amazing how one bad sensor can make an otherwise great engine run like a pig. The sensor has been replaced and a broken wire to the sensor fixed, now it runs flawlessly. "

Jeffrey Turcotte

• 8991 Answers
• Posted on Mar 31, 2011

SOURCE: 2003 Lincoln Navigator error code

Please check voltage at the crank sensor with key turned on. Should be at least 4.5 volts. Also check tone ring at sensor. rotate engine to observe all teeth. There should be one tooth missing and no chipped teeth, debris, or other issue that could corrupt the signal. Backprobe the signal wire and measure the signal with your voltmeter set to AC. The AC voltage should increase with engine RPM.
Sorry, but I cannot find the wiring diagram for the crank sensor. If possible and especially if the reference voltage at the sensor connector is wrong, trace the sensor wires back to the PCM to see if there is an open or short in the wiring. Please let me know what you find out.