Code P2004, Check Engine light on?

DENISH58

MEMBER
2007 FORD FOCUS
2.0L
4 CYL
2WD
AUTOMATIC
150,000 MILES

Initial problem, when driving at a certain point, I want to have more speed so I put the pedal to the floor, the RPM will go up, but the speedometer won't, it is like the motor is thinking about it and thinking but it happens only on and off, not every time. After a couple of times, it appears to do it when it is very hot outside and humid, the rest of the time it will perform without problems.
So, somebody found the code with a machine, and it is code P2004. We verified with a compression test for the 4 cylinders, and it is in the normal range, we changed the spark plugs.
Somebody else with a more sophisticated machine found the code P2006 that the Intake Manifold Runner Control Valve needed to be changed, so we changed it, and the engine light is still on and the P2004 still appears.

I'm living near Montreal, Quebec Canada, the outside temperatures are not too hot or humid, so I could not verify more but I still have the engine light on.

What should be our next step?

1 Reply

AL514

MECHANIC
4,692 POSTS

Hello, this code indicates that the intake manifold runner is stuck open, I assume your vehicle has a plastic intake manifold as well?
This can be an issue with the actuator or solenoid that controls the runner. There are 2 different systems it looks like for this model; the Actuator is an electronic motor that moves the intake runner. The Solenoid controlled design uses a solenoid to control vacuum to the solenoid and is monitored by a small module at the end of the intake runner.
When you replaced the runner did you notice if there was a vacuum hose going to the end of the runner? If it's a vacuum controlled system, it might be the solenoid is bad or not receiving vacuum. I'll post a picture of the vacuum controlled design.
It's important to know which system we are dealing with here first. The motorized actuator doesn't have a position sensor on the end like the vacuum controlled system does.
The motorized system also only has a 2-wire connector on the motor, whereas the vacuum controlled system has 2 wires to the vacuum solenoid and 3 wires the module (or position sensor) at the end of the runner.

These systems basically vary the amount of air coming into the intake manifold by rotating the valve to close or open the intake more.
And most times because the intake manifolds are plastic, they can warp because of heat over time and the runner will stick inside and not rotate correctly, that's why we will usually replace the intake manifold with the runner

This is a video that was posted on the All-Data tech community section, All Data is where we get our service info and wiring diagrams etc, but this will help you to understand if it's a vacuum controlled system or not.
https://www.youtube.com/watch?v=eAZCAxpv7Uk

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