Ford Taurus

[Brandon]

I have been working on a 2005 Ford Taurus for several months now trying to fix a problem. I have been dealing with miss fires and almost all the cylinders. I replaced the spark plugs the leads and the coil pack and check the firing order twice. The problem seemed to fix itself for about two weeks, however the problem has come back with avengance. All six cylinders are missfiring and the tacometer never stays in one place when it idles. My code reader is saying that both banks are running lean also getting a code that says missfiring below 1,000 rpms on start. However, I checked for vacume leaks and cleaned the mass air flow sensor with no avial. Im not sure what more I can check. Any advice greatly appriciated.

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[Bluesnut]

If you’re certain there are no air leaks and fuel pressure is good you might consider the crank position sensor.

An EGR pintle sticking open could also cause this and like the CPS can be a now and then problem. This kind of problem may also not set any code or turn on the Check Engine Light.

[Author]

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