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The vehicle in question is a 2012 BMW E91 318d. Query on cleaning the intake manifold.


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Greetings, individuals.

I have a question about the intake manifold of a 2012 E91 318d.

Essentially, I purchased the vehicle in January of this year with a mileage of 151,000. The timing chain and clutch were just replaced the week I got it. When I inquired about the problem with the chain, the seller informed me that it was making noise.


The automobile performs well and exhibits smoothness in general. However, there is a problem with the engine's idle after it has been running for 10 minutes and is warm. After diagnosing the issue using Ista software, I have identified fault codes 480 and sometimes 480A, which indicate a blockage or clogging in the Diesel Particulate Filter (DPF).

Plausibility of air mass to exhaust gas recirculation (EGR) ratio: 4862

Today, I received a 4D00 back pressure sensor. However, both the 4862 and 4D00 sensors indicate a negative response.

While 480 always responds affirmatively, sometimes when deleting errors, they all disappear temporarily, but 480 always reappears after about 30 minutes.

The Diesel Particulate Filter (DPF) was replaced in 2019, however I suspect it is not an authentic BMW part. Furthermore, it has accumulated a mere 40,000 kilometres.

Currently, I am aware that there may be additional factors preventing the regeneration of the diesel particulate filter (DPF). I am systematically addressing these concerns by cleaning various components of the automobile.

The MAF sensor was detached and treated with electrical cleaner, while the air box and piping were thoroughly cleaned. Initiate adaptations reset.

The DPF back pressure sensor has been removed and cleaned, and the pipe connecting it to the manifold was previously obstructed but has now been cleared.

The EGR cooler was severely obstructed, so I took it out and thoroughly cleaned it. As a result, the diagnostic tool currently indicates that it is 99.1% free from blockages.

Today, I removed the pipework connecting the EGR cooler to the intake manifold. I discovered that it was heavily coated with carbon residue. I proceeded to clean the intake pipes, EGR to intake pipe, throttle body and the plastic pipe that connects to the intercooler boost hose using appropriate cleaning fluids. I also used electrical cleaner on any sensors. After thorough cleaning, everything is now ready to be reinstalled. However, upon inspecting the intake manifold, I have decided to remove

I am unable to clean the intake ports because I lack the necessary tools, such as an endoscope to check if the valves are closed. However, I wonder if it would be sufficient to clean only the intake manifold and leave the intake ports untouched until I can find someone to perform the task for me. If I see any conspicuous fragments in the ports that appear prone to dislodging, I will cautiously attempt to extract them. However, if possible, I would want to refrain from handling the ports due to my lack of expertise and appropriate equipment.

1) If I proceed with removing the intake manifold, which I now feel obligated to do, would I be in a satisfactory condition?

2) If anybody is aware of a location where I can have a walnut blast performed on the intake ports, it would be much appreciated if you could provide that information.

3) Is it a significant problem if carbon falls down the port?

Thank you in advance, gentlemen.

I am now addressing the necessary tasks that need to be completed owing to distance and other factors.

Concerning the problem I am experiencing with my vehicle, namely the issue of a rough idle and error code 480, I suspect that the cause might be a faulty Mass Air Flow (MAF) sensor, an exhaust back pressure sensor, or a clogged Diesel Particulate Filter (DPF) that requires cleaning. Once I have completed the cleaning of the intake manifold and the replacement of the Manifold Absolute Pressure (MAP) sensor, my next task will be to address the potential issues with the MAF sensor, exhaust back pressure sensor, or DPF.

After completing the intake manifold and dpf filter cleaning, I will proceed to replace sensors if the problem persists.

Once again, any assistance provided would be much appreciated.

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Was the automobile informed about the installation of a new DPF?
The number 480 seems familiar, but I am uncertain. It may be a code that indicates the need for a replacement Diesel Particulate Filter (DPF) after a certain period of time.
Indeed, I had the item and informed the vehicle of its presence, prompting the vehicle to resume the regeneration process. Subsequently, no issues were encountered.

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I have considered this possibility as I have recently begun utilising Ista and familiarising myself with it. I have conducted tests and attempted to perform regenerations. It is possible that I may have selected an option indicating that the diesel particulate filter (DPF) needed to be replaced, but I did not complete the procedure to indicate that a new one was installed, even though it is actually the same DPF. Therefore, I will attempt this step before resorting to physically removing the DPF and manually cleaning it.

Regarding the 480 code, I would have expected the diesel particulate filter (DPF) to have been programmed in during 2019. However, I am uncertain. Once I have completed the intake repair, I will attempt to address the issue.

Thank you for the guidance, NevoBMW320i👍👍👍

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When I cleaned my manifold, I meticulously cleared the ports using a screwdriver and cloth. I ensured that the valves in the ports I was working on were closed by manually turning the engine over. I have repurposed an antiquated hoover by affixing a segment of garden hose to serve as an auxiliary instrument for collecting loose debris. In actuality, a little amount of carbon residue will not cause any problems. If it does get through, it will just be incinerated. The presence of debris in these manifolds seems logical, since under increased pressure, particles are likely to pass through.
Have you inspected for any air leaks? The breather pipe and the intake pipe from the MAF to the turbo are susceptible to developing splits. The intake is often located inside the grooves on the convoluted portion.

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I have not thoroughly inspected the boost hoses or vacuum for leaks yet, but I will do so. Currently, I do not see any visible or audible abnormalities. However, I would need assistance in revving the engine while I do the inspection.

Regarding the cleaning of the ports I believe I can handle it, following the method provided by George Auster on YouTube. Once I get the necessary equipment, such as a hoover and brushes, I will attempt it.

1) I would want to inquire if it is possible to determine whether the valves are closed by seeing the intake ports.

When manually rotating the engine, is it necessary to return the engine to its original position after cleaning the ports, or can I just reassemble everything and go without any specific adjustments?

Thank you for addressing the issue of any dirt and debris entering the ports. It is preferable to have little to no unwanted substances, such as muck, coming into the ports.

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Indeed, by illuminating the area with a light, one may determine if the valve is in a closed position against the seat.
Simply rotate the engine in a clockwise direction to the appropriate position, and then go to the next cylinder. There is no need to reposition the engine to a certain location after completing the necessary tasks.

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Thank you so much,ENVIOclev . I appreciate it.

The right manifold has been well cleaned and is in excellent condition. It was simpler to work on compared to the m47. Although the bathtub was not cleaned, I was able to tidy it up before Mrs. returned.

Indeed, the EGR system, including the cooler and the piping connecting the EGR cooler to the intake manifold, was severely obstructed. However, thorough cleaning has been performed, resulting in total removal of the blockage. The intake manifold is now 96% clean, with no visible carbon residue. Nonetheless, there may still be a small amount of carbon residue in hard-to-reach areas.

The cars have all been rebuilt and are now idling. The temperatures are all at the correct levels, and there are no fault codes detected so far. Additionally, the cars are driving and sounding substantially improved.

In terms of driving, it was previously smooth overall, but now it has become very responsive right from the start. It just feels and drives even better.

There are no trouble codes.

The engine seems to be operating well so far, with improved air intake and a more prominent turbo effect.

I accessed Ista and performed a reset on the Maf. Additionally, I installed a new dpf, although the description provided is not accurate. I also carried out DPF modifications for both components.

I spoke prematurely as the 480 is now functioning again. I plan to do diagnostic tests, but I believe it just requires being driven and demanding a regeneration process. I will assess its condition after that.

There is no rough idle in the vehicle, and I have been driving it for 30 minutes. However, after installing a new diesel particulate filter (DPF), the automobile began to experience hesitation in terms of idling and required resetting of the adaption.

I will provide an update on my progress whenever I get more information.

Furthermore, I have not yet addressed the ports, which have accumulated a significant amount of residue. The valves also exhibit some build-up. However, the work I have completed so far has already resulted in a substantial improvement.

However, as soon as I get some free time and the weather is somewhat good, I will absolutely start working on it, perhaps in the near future.

The only item I want is a crank turning tool, since the one I now own seems to have four torques based on my first observation.

I would like to mention that the counter pressure readings of my exhaust have decreased.

The idle has decreased from 75 to 33, while the maximum value is 35.

The rotational speed decreased from 150 to 111.

The speed was reduced from around 350 to 251.

The maximum value is 200.

We are making progress in the correct way.

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I recently ventured out into the darkness to retrieve my Autel scanner, hoping that I had saved the codes. Unfortunately, this was not the case.
I find it frustrating because the code seems familiar, but when researching it, I see that it is not what I first thought.
I informed my vehicle that it had a new Diesel Particulate Filter (DPF), then proceeded to drive on the divided highway while monitoring the exhaust temperatures and observing the regeneration process.
I believe I also made an additional request for regeneration around one week later as a precautionary step.
Has been consistently effective since May 23rd.

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