3.0 Engine Misfire on 2001 Ford Taurus


#1

I had a consistent misfire on this car and finally got a P0301 trouble code. I installed new Autolite AP 104 plugs and wires. Now, when I start the engine. it runs perfectly. But when I put it in gear, it misfires. After a minute or so, the misfire clears and the engine runs perfectly. I have not received another trouble code. One thing I did notice is that the plugs I took out (Motorcraft AWSF 32P) had a much larger gap than the .044 the associate at AutoZone set the new plugs to. Sure would appreciate some suggestions. Thanks.


#2

The plug gap grows wider b/c the electrodes wear away the more miles driven. If it gets too wide the engine will ping and misfire. That can also damage the coil(s). B/c of the wide gap you noticed in the plugs you removed, suspect a damaged coil.


#3

Thanks for that reply. I appreciate it!


#4

My taurus plugs had .090 gap when i had my misfire code. Than the coil had to be replaced a few months later. But I have the 12v motor.replace ur PCV elbow too. Did u take off the wiper cowl to remove the rear plugs? U didn’t say so I assume u have 24v motor.


#5

Thanks for your reply. I am unsure of your reference to the “PVC elbow” and “12v motor”. I did not have to remove anything to remove the rear plugs. Thanks again for your reply.


#6

12 valve is Vulcan motor. 24 v is duratec. Vulcan has 1 coil. If u changed plugs ur self, u might be aware of that. Some folks are blissfully ignorant. Which is not the same as not smart.


#7

If OP changed the rear plugs without removing anything else, I’m thinking Vulcan motor

I’m also thinking Vulcan, because it was by far the more common motor in 2001


#8

Any chance this is an idle problem (vacuum leak, Idle Air Valve, etc) problem? It sounds like you’re referring to a stumble due to the idle dropping a bit low when you engage the transmission.