SOLVED: 4.6is with "throttle briefly jammed"

[Purplecty]

Originally Posted by Dking078

Throttle bodies rarely fail.



Open your DME box, remove the 3rd connector on the DME (Or just all of them) and inspect the connectors for oil/coolant residue. Yes you read that right.



It's a known issue for the M62 and can cause false positive codes related to the TB.



If you do find anything, clean it up, start the car, and HOLD the rpms for a good min at ~ 1500 (just holding it is the core here) so the car establishes control again for idle. Weird but it happens sometimes.

I have seen the oil issue on a friend 03 540i where oil from the VANOS solenoids made it to the DME and also know about the coolant traveling to the DME connector issue as well. I installed the mechanical 88c tstat to help protect from the coolant issue.

[Estoril]

I'm back after some more researching. The DME connectors were totally fine and clean, but this morning I suddenly got the engine failsafe program after doing groceries. That was scary.. luckily it was only a short drive back home so I let the car cool down and opened the hood. The drive back home really felt like it had a vacuum leak, there was basically zero throttle response and a very rough idle.

As soon as I even touched this rubber hose and moved it the tiniest bit, the RPM would jump up and down. Sometimes when moving the hose the car just instantly dies.

I took a video of it happening as well as a short clip following where the hose goes:
https://youtube.com/shorts/BqUJYEn1Hmc?feature=share

I have a couple of questions now:
- Is this for the fuel tank ventilation? Or is it the oilpan ventilation? I'm assuming the first
- I have temporarily closed the vacuum side (TB side) with a bolt, and left the other side open so it can ventilate. Is this dangerous to drive the car like this? It is only temporary until I get it properly fixed
- Does this also explain the "throttle body briefly jammed" faultcode, considering the vacuum is on the TB?
- I tried spraying the entirity of the hose with brake cleaner to figure out where it was leaking exactly, but there was zero response. Moving the hose even 0.5cm up or down causes a huge spike/loss in RPMs. How does this make sense?



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[StephenVA]

BMW Parts Catalog \ BMW X5 E53, SAV \ Part groups \ Fuel Preparation System \ Fuel tank breather valve \ Fuel tank breather valve

BMW X5 4.6is E53 SAV USA M62
Fuel tank breather valve

Valves/Pipes of fuel injection system

LINK: Fuel tank breather valve | BMW X5 E53 X5 4.6is M62 USA

Inspect for cracks: Rubber hoses, hard plastic hose, connections, Valve, etc.
Solutions: Add clamp that is missing at TB
Replace all the rubber hoses.

Retest with carb cleaner

[Estoril]

Originally Posted by StephenVA

BMW Parts Catalog \ BMW X5 E53, SAV \ Part groups \ Fuel Preparation System \ Fuel tank breather valve \ Fuel tank breather valve



BMW X5 4.6is E53 SAV USA M62

Fuel tank breather valve



Valves/Pipes of fuel injection system



LINK: Fuel tank breather valve | BMW X5 E53 X5 4.6is M62 USA



Inspect for cracks: Rubber hoses, hard plastic hose, connections, Valve, etc.

Solutions: Add clamp that is missing at TB

Replace all the rubber hoses.



Retest with carb cleaner

Thanks Stephen, this really helps!!

I will order part 13907556934 (the hose elbow piece) along with some new hose clamps and install it ASAP!

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[Estoril]

After installing a couple hose clamps, the issue seems to have disappeared. The checkengine light also went away after a ~15 minute drive (after restarting the car), idle is very smooth again even when pulling in the hoses that are now clamped up!

I could not find any sign of even the slighest bit of damage or cracks on either side of the hose, so I'm suspecting it really is just the missing clamps that was causing this problem.

Do you reckon it's still best to replace the hose, just in case?

[Estoril]

After installing a couple hose clamps, the issue seems to have disappeared. The checkengine light also went away after a ~15 minute drive (after restarting the car), idle is very smooth again even when pulling in the hoses that are now clamped up!

I could not find any sign of even the slighest bit of damage or cracks on either side of the hose, so I'm suspecting it really is just the missing clamps that was causing this problem.

Do you reckon it's still best to replace the hose, just in case?

[StephenVA]

If the hose does not have any cracks, is not getting brittle, and holds vacuum after adding the missing mini clamps, then I would not replace it. Add a little rubber protectorate and you are good to go!

Try 303 Space Age protector for a long lasting none greasy solution

On the part exploded images I posted. There are two sites for BMW parts look up that can be accessed for free.

https://www.realoem.com/
BMW Parts Catalog

Add your VIN number and the parts that fit your car can be seen easily.

[Estoril]

Originally Posted by StephenVA

If the hose does not have any cracks, is not getting brittle, and holds vacuum after adding the missing mini clamps, then I would not replace it. Add a little rubber protectorate and you are good to go!

Try 303 Space Age protector for a long lasting none greasy solution

On the part exploded images I posted. There are two sites for BMW parts look up that can be accessed for free.

https://www.realoem.com/
BMW Parts Catalog

Add your VIN number and the parts that fit your car can be seen easily.

Even with the new clamps and even though the rubber pieces all look like they are in perfect shape, I still seem to get a slightly unstable idle RPM. I have ordered a replacement for the entire hose part top to bottom for roughly 36 euro, let's see how it does with the new rubber and new clamps!

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[Estoril]

Replaced the hose with a new OEM piece along with the new hose clamps and the problem has been solved

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[StephenVA]

Yea!