Question about 2001 Ford Escort ZX2

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P0171 code on 99 Ford Escort ZX2 2.0L

I've had a rough idle/stalling problem. Never threw a code or CEL. Replaced the fuel filter and it cleared up. A couple days later the CEL came on and I got a P0171 code. I replace the air filter, removed and cleaned the MAF sensor and cleaned the intake piping- there was a light coating of dust in it. I also noticed some carbon build up in the throttle body and it has a strong odor of fuel. What should be my next course of action?

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  • mjmullis79 Jun 30, 2009

    Fixed, found elbow to PCV valve had a hole melted thru it. Thanks

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Check vacuum hoses to MAP sensor. They can get porous after a while. Also check hose to EGR valve.

Posted on Jun 27, 2009

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I am kinda tired trying to remember that engine but I believe p0171 is a system to lean code check pcv valve, if its the one I think the rubber hose tends to colapse, other possible causes intake leak or even a leaking injector

Posted on Jun 27, 2009

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Check for air leak after the MAF.

Example: plastic air duct between block and MAF.

The computer see one value and the it's more air and different temp. entering engine.

So it will ran lean.

===

Are you using K&N type air filter?

Make sure you are not over oiling the filter.








Posted on Jul 09, 2009

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