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1996 Ford Aerostar Question: (po306 only)rough idle after warmed up,good accelaration & off idle preformance



, 4.0L V6, Flagstaff, AZ, June 02, 2013, 22:25

new plugs,wire's,coil pack,02 sensor,isc motor.good compression vacuum steady at 18 motor has valve train noise after warmed up changed rocker arms & push rods on #4,#5,#6 head motor runs & sounds 50% better code po306 came back after one day.the motor dose not over heat no back firing motor will spin the tires.Question will the code po306 set if cylinder #2 is miss firing since coil pack fires both cylinder #2 & #6 at the same time

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  • Answer #1

    June 03, 2013, 08:04

    IF it runs rough only at idle and compression is good on all cylinders, recheck for a vacuum leak, may need to smoke test the vac. circuit to find. (2 has nothing to do with 6)

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  • Answer #2

    Greg's Orange Auto (15380 Answers) , Orange, CA - (714) 702-1367
    globalhelper June 03, 2013, 09:34

    misfire #6 cyl have it diag as to save time and money

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