2002 explorer engine miss firing shaking sucking major gas

290

Asked by Feb 05, 2015 at 12:29 PM about the 2002 Ford Explorer

Question type: Maintenance & Repair

2002  ford  explorer had a tune up was running  great then bumped a curb from all the snow here. Now it is missing cyl.  3 & 4   we had  new plugs put in those 2 cylinders  and the codes cleared. but 5 miles later service engine light is back on. has anyone ever had this problem ?  what could it be ?

4 Answers

16,080

Could be a bad spark plug wires or the ignition coil. You will need a multi meter to check resistance on the wires and coil. Check the resistance on both the primary and secondary coil along with power being supplied to all three sections of the coil if it is a V6.

1 out of 1 people think this is helpful.
290

Thank You.... the Spark plug wires are new. ... So maybe we will go with the coil it is in cyl. 3 & 4 plugs are new ... it had a tune up and ran great then the 19 year old plowed it to a curb in all the snow we are having and then it started miss firing and sucking tons of gas, could it be a head, or head gasket ? I hope not... would be easier if it was just a couple of wire a just a coil... thanks

16,080

If you look at your coil there are three rows, two plug wide = 6 plug wires. The misfire you are experiencing in cylinders 3 and 4 represent the back two plug wires with the position for the # 1 plug wire for cylinder # 1 (bottom left of engine) being either on the bottom left of the coil or the top left, depending if the coil is situated horizontal or vertical. Each coil is divided up in pairs controlling two cylinders. In your instance the paired coils are 1-5, 2-6, and 3-4. Since cylinders 3 and 4 are experiencing the problem I suspect a problem with the coil. Cylinders three and four on the engine translates to the back cylinder on the left (3) and the front cylinder on right (4). The gasket would have to have gone out on both sides of the engine at the same time, doubtful. Checking the coil with a digital multimeter is not difficult. The net should indicate the specs.

2 out of 2 people think this is helpful.
290

Thank you, OJ... sounds like the thing to do is check and test the coil. Really like the way you analyzed this very nice help.

1 out of 1 people think this is helpful.

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