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Models up and down runs great if idle, changed MAF PCV valve…

Customer Question
Models up and down...

Models up and down runs great if idle, changed MAF PCV valve tune it up, its almost acts like I got water in the gas. pulling a P1131 code which is the upstream o2

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

Good ggas milage starts fine no vaccum leaks where i could find

Mechanic's Assistant: What is the model/year of your Ford?

2000 ford focus Z tech ohc

Mechanic's Assistant: Are you fixing your Focus yourself? What have you tried so far?

Changed maf, pcv valve, plugs wires..

Submitted: 1 year ago.Category: Ford
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Answered in 3 minutes by:
8/6/2017
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago
AMEDEE
AMEDEE, FORD TECHNICIAN
Category: Ford
Satisfied Customers: 28,313
Experience: ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

I am very sorry your having this issue with your vehicle.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.

2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.

3. Please understand that I am here to help you any way I can.

As long as the fuel system check out good (fuel pressure within specs and no internal or external fuel leaks) and the MAF was replaced, this condition is caused by an air/vacuum leak. The most common would be the PCV valve or elbow at the PCV valve. However, it could be anything leaking vacuum. If the PCV valve was replaced and the lebow was checked and verified as good, then the next step would be to use a smoke machine to check for vacuum leaks in the intake and air induction system using a smoke machine (with the engine off of course).

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Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

If your certain there are no air or vacuum leaks, the next step would be to check the throttle body, throttle plate (sure it is not stuck open or binding for any reason), the Throttle position sensor and signal as well as the idle air control motor located on the throttle body assembly.

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AMEDEE
AMEDEE, FORD TECHNICIAN
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Satisfied Customers: 28,313
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Experience: ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector

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