coil

[mercury5]

what are some of the symptons of bad coils and oxygen sensor. i changed my furl filter. but car stills jerks at low speeds. under 40.:mad2:

[Ktorres1]

So many symptoms it's hard where to start but just watch your voltage meter when it jerks and it'll more than likely be a coil.

[SlkMerc]

So the jerky volt meter=bad coil? I have the same symptoms but not as severe. Mine just craps out at 40 and then back on the pedal. It seems to not drop a gear and lumbers a little before the R's pick up. Ive barely had it a month and trade off driving a completely different car often. I may just not be used to how to sweet spot the car yet. Car has 30800 miles. I changed the FF as well, helped a little or so I thought.

[fastblackmerc]

So many symptoms it's hard where to start but just watch your voltage meter when it jerks and it'll more than likely be a coil.

What does an ignition coil have to do with the voltmeter? :shake:

A bad coil will show up as rough / uneven idle, hesitation, missing or bad fuel mileage.

[musclemerc]

^^^What he said.

[Blackened300a]

What does an ignition coil have to do with the voltmeter? :shake:

A bad coil will show up as rough / uneven idle, hesitation, missing or bad fuel mileage.

Yeah and the CEL never seems to come on.