misfire on cylinder 1

Like I tell everyone. 2nd opinions are not just for your doctor!!!! Take it somewhere else. If you get the same answer, then it is the case. Having a cylinder misfire on cylinder 1 may just be something cheap and simple. But honestly, you do not know what codes they deleted out of the system. Did they perform a flow test on the injectors? Did they read the voltage at the MAF? Did you ask them HOW they came to their conclusion? Having a code of p0301 is really just that.. A code.. There are soooo many possible reasons you would get that code. My recommendation, take your car for a 2nd opinion.

There are a finite number of things that can cause a misfire: 1. lack of fuel 2. lack of spark 3. lack of compression. First let me say this, your MAF and injectors are not the cause. The MAF sensor on your car serves two purposes: It allows the ECM to calculate air flow into your engine, and helps the ECM infer barometric pressure. If this guy malfunctions you will experience drive-ability issues such as searching idle and lack of power. It messes up your air/fuel ratio. The injectors on the other hand, are probably also not the culprit. If they pressured up the fuel system and did an injector balance test by powering them up individually and watching the pressure drop, while comparing between cylinders, I might believe that ONE injector needs to be cleaned or replaced. Been a mechanic for 10 years and have not seen many injector problems. Most common on the Taurus: ignition misfire and vacuum leak. The coil pack and the ignition wires need to be inspected thoroughly.

I had the misfire on #1 on my 2002 3.0 Ford. But, it really didn't feel like a misfire on #1, the car just seemed sick with no one cylinder misfiring constantly? Changed the #1 plug twice, changed the coil pack, changed the head gasket, and intake manifold gasket...it wasn't going to beat me! Ended up being a dirty fuel filter. Changed the filter and the car ran great. I read on another site that the computer catches the #1 misfire first and displays #1 instead of showing that all plugs are misfiring...I don't know if it is true or not but this would explain why only #1 was seen?

Currently trying to fix 2001 Taurus misfire. I took an insulated wire, connected one end to battery (either ground or positive I forget but you can check by trying both) and started the car. Then one by one I took each of the 6 distributor cylinder plugs off, brought the end of the wire close to it, there should be a spark jumping from the distributor to the wire, and put it back on. I noticed that cylinders 1 and 2 had a weaker spark than the others. This means it's probably not my spark plugs or spark plug wires (since they were being skipped and the spark was still weak) and it's not something that will affect all the cylinders at once like the fuel filter/pump or the MAF. It's probably the distributor. Hope this helps somebody.