Vacuum lines diagram needed

Hi,

For some reason, my manuals are not providing a vacuum schematic for this vehicle. However, I was able to find a couple of things that may help.

If you look at pic 1, that shows the vacuum hoses specific to your vehicle's emissions system (EVAP). Pic 2 shows a general design that Ford uses.

Now, there should be a vacuum schematic label under the hood. If possible, take a pic of it and upload it for me to see. From that, I can tell what your vehicle came with.

Also, if you are trying to find a vacuum leak, here is a link that explains how it's done. I will also tell you that there is a vacuum hose that comes off the rear of the intake and has a 90-degree turn in it. The turn is a common failure issue due to dry rot. They crack and leak.

Here is the link:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if this helps.

Take care,

Joe

See pics below.

Hi,

Sorry to hear you are still dealing with this. The codes are somewhat interesting. Two of them deal with a catalytic converter issue, and the other two (which I believe you already know) deal with variable timing.

Since you have already replaced the components related to the timing, it is likely a short or open circuit keeping the P0011 and P0021 stored. Which would lead me to follow testing designed to pinpoint the specific cause.

I have attached them below. Take a look through them and let me know if you are comfortable performing them. Also, the catalytic converter codes are likely indicating a need for replacement. One is a temperature indicator and the other indicates the converter is operating below threshold.

Take a look through these and let me know your thoughts.

Take care,

Joe

See pics below.

Hi,

The muffler itself shouldn't change anything because it is after the catalytic converters and oxygen sensors. You do have a P0420 which is related to the catalytic converter operating under the threshold. Most times, that is simply a faulty converter. However, if there is an exhaust leak before the converter (5.4L often have exhaust manifold leaks) it can cause the system to think there is a lean fuel mixture and set codes.

At the exhaust manifolds, a leak on these often times sounds like a tick when the throttle is pressed. Have you ever noticed anything like that? You could hear it at idle, but if it is a small leak, it may not be too noticeable.

Note that P0435 is also catalytic converter-related (temp). Are these codes still showing and have you replaced the converters?

Let me know.

Joe

Hi,

Thanks for the update. It's appreciated and will likely help others in the future. Regardless, I'm glad to know you found the problem and were able to repair it.

Feel free to come back at any time in the future if you have questions or need help.

Take care,

Joe