Bimmerfest BMW banner

1 - 5 of 5 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
Hey All,

Hoping to get some help or insight on my issue that I've been chasing for months. I purchased a 2010 BMW 335D a few months back, it wouldn't start.

I sent all (6) injectors to a shop for testing. All injectors had a weird issue connecting to the Bosch testing machine, so the shop deemed all (6) faulty (but the tech said it might still run if I replaced a couple of injectors that looked the most caked up with carbon.

I purchased (2) new injectors from Ebay and installed them in place of cylinder 3 & 5. The car started up and after some smoking a bit ran quite well.

Almost right away, I started getting code 4580 (Rail-pressure plausibility, delivery controlled) - Engine Limp Mode. I tested the specified and actual pressure, and I'm getting double actual vs specified ONLY AT IDLE. (For example 500bar/250bar at idle). Weird thing is that when I drive on the freeway, car drives perfectly, no Limp Mode! I read multiple posts with this issue and it seems everybody has either something small that fixed the issue or they didn't end up figuring it out.

Here are the things I've done so far and parts I've replaced:

1. Replaced: Quantitative Fuel Control Valve at the HPFP (purchased new)

2. Replaced: Fuel Pressure Sensor & Fuel Pressure Regulator & Fuel Rail (purchased as a set, used on Ebay, but tested and functioning)

3. Checked: All fuel return lines (from fuel rail & HPFP to gas tank). Other than a small kink in the line, didn't seem to have any restrictions (I even started the car with the line off at the fuel delivery unit(driver's side), and the return fuel literally filled a water bottle within 5-10 seconds of running. (I'm aware of the return fuel line blockage bulletin: https://static.nhtsa.gov/odi/inv/201...003-49621P.pdf)

4. Multiple members on the diesel bmw facebook group suggested that they had the same code on their vehicles and it ended up being faulty injectors. They suggested to do a leak down test.

5. Performed: Leak down test on all (6) injectors. Almost all fuel leak down levels were equal. Only (2) injectors had about 1/8" more diesel in the water bottle after running for ~13 minutes.

I'm stuck here and have no idea what to do next. Do I buy (4) more new injectors and hope this fixes my issue. It might end up being a $1000 expense I didn't need to make.

Help Help Help!! I just want to fix the car and enjoy driving it already!! Thanks all:bow:
 

·
Registered
Joined
·
830 Posts
Fuel filter?
 

·
Resident Curmudgeon
Joined
·
22,223 Posts
I***8217;d be super concerned about buying on eBay. We had a recent story of someone buying ***8220;Bosch Remanufactured***8221; injectors and getting garbage.

Having said that, you bought two and the car ran. Maybe 4 more would do it?

Also, the whole system is calibrated to hit certain pressures and flows- if 4 injectors are not flowing, the system doesn***8217;t ***8216;know***8217; this...perhaps that is why you are seeing rail pressure issues?

You bought a dead car. Anything short of not needing a new engine and tranny should be upside, no?
 

·
Registered
Joined
·
5 Posts
Discussion Starter #5
I'd be super concerned about buying on eBay. We had a recent story of someone buying "Bosch Remanufactured" injectors and getting garbage.

Having said that, you bought two and the car ran. Maybe 4 more would do it?

Also, the whole system is calibrated to hit certain pressures and flows- if 4 injectors are not flowing, the system doesn't 'know' this...perhaps that is why you are seeing rail pressure issues?

You bought a dead car. Anything short of not needing a new engine and tranny should be upside, no?
Thanks. Yes, I've been told that injectors have solved 4580 for some people. I've been thinking of just ordering 4 more injectors and seeing if that helps. Theoretically it might be possible for the remaining 1, 2 or even 4 older injectors to not actuate properly at idle only, essentially building up the pressure in the rail.

Interesting thing is that the leak down injector test had decent results and the car runs and drives pretty well otherwise. Literally 5-6 threads on the same exact symptoms with no solution, I even heard BMW had vehicle buybacks because if this issue.

After all the testing I've done, it feels like some kind of blockage somewhere in the system. I even opened up the LPFP and its sending unit today and all seemed ok there..

I wouldn't necessarily say I purchased a 'dead' car. It only has 107k miles, extremely clean inside and out, and the only reason it was dead was because the previous owner had it towed for DUI and it sat in the tow yard for 6 months without being started.

I might just pull the trigger on the injectors. Wish there was more tests I could run on them but seems like there are limited options with software testing.
 
1 - 5 of 5 Posts
Top