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2012 35I Code 28A0 throttle angle/intake pressure

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139K views 26 replies 16 participants last post by  Tomcat05  
J
#1 · (Edited)
X5 35i with 101K mileage, just got car and have no service history.
Very rough idle--Code 28A0 Throttle valve opening angle-intake pipe absolute pressure, comparision pressure too high.

Just replaced a filthy air filter-looks like original, cleaned charge pipe an throttle body. I did reconnect vacuum to back of TB with (new gasket) and electrical connector.

I understand what the computer is trying to compare, just not sure what else to check??

I checked all vacuum lines, pressure switchs, and MAF sensors. Nothing looks out of place. The Plugs and coil look original, which i will replace.

I also found a two pin connector directly below Throttle Body that isn't connected to anything? 2-BMW mechanic's at local dealership said it just an extra wire?? Pic attached
 

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N
#2 ·
Jon Beck said:
X5 35i with 101K mileage, just got car and have no service history.
Very rough idle--Code 28A0 Throttle valve opening angle-intake pipe absolute pressure, comparision pressure too high.

Just replaced a filthy air filter-looks like original, cleaned charge pipe an throttle body. I did reconnect vacuum to back of TB with (new gasket) and electrical connector.

I understand what the computer is trying to compare, just not sure what else to check??

I checked all vacuum lines, pressure switchs, and MAF sensors. Nothing looks out of place. The Plugs and coil look original, which i will replace.

I also found a two pin connector directly below Throttle Body that isn't connected to anything? 2-BMW mechanic's at local dealership said it just an extra wire?? Pic attached
Click to expand...
Did you ever solve this? Same boat as you...
 
J
#3 · (Edited)
Code 28AO

Hi,
Yes we finally figured it out after taking the car to 2 bmw specialty shops and finally a bmw dealer. BMW finally fiugred out the problem after we tested every engine sensor, fuel system, etc. They had to open a special case file with BMW corporate to finally get to the root of the problem.
The Camshaft Bearing caps were actually starting to fail !! The sides of the caps were actually expanding on the sides and starting to distort, which would result in complete engine failure in time. We think that the X5 had a lack of oil changes between 40-80K miles, which can cause the oil viscosity to thin out causing the premature wear of each bearing cap. We removed two intake camshaft caps and exaimed them closely to see the wear and expansion on the sides. Not sure how bmw figured this out but they were correct in the diagnosis. One of the specialty repair shops we went to also told us the motor was going to detonate and was going to fail completely. I guess they have seen this before.
After getting quotes of $12- $15 K to replace a head or used motor we just traded the car in at a different dealer.
If you have checked all of main culprets like the, throttle body, MAP sensors, air pressure sensors, fuel, etc., I would recommend you get rid of it quickly or pull the valve cover and look at the camshaft parts. I understand the code it was throwing and the difference between air pressure readings, just never really understood how rod caps can cause this???

Hope this helps, sorry for any bad news but thats what happed to us.
 
N
#4 ·
Jon Beck said:
Hi,
Yes we finally figured it out after taking the car to 2 bmw specialty shops and finally a bmw dealer. BMW finally fiugred out the problem after we tested every engine sensor, fuel system, etc. They had to open a special case file with BMW corporate to finally get to the root of the problem.
The Camshaft Bearing caps were actually starting to fail !! The sides of the caps were actually expanding on the sides and starting to distort, which would result in complete engine failure in time. We think that the X5 had a lack of oil changes between 40-80K miles, which can cause the oil viscosity to thin out causing the premature wear of each bearing cap. We removed two intake camshaft caps and exaimed them closely to see the wear and expansion on the sides. Not sure how bmw figured this out but they were correct in the diagnosis. One of the specialty repair shops we went to also told us the motor was going to detonate and was going to fail completely. I guess they have seen this before.
After getting quotes of $12- $15 K to replace a head or used motor we just traded the car in at a different dealer.
If you have checked all of main culprets like the, throttle body, MAP sensors, air pressure sensors, fuel, etc., I would recommend you get rid of it quickly or pull the valve cover and look at the camshaft parts. I understand the code it was throwing and the difference between air pressure readings, just never really understood how rod caps can cause this???

Hope this helps, sorry for any bad news but thats what happed to us.
Click to expand...
Sweet baby jesus that sounds awful.

Well, thanks for the response. I'm hoping that the code can be reset via adaption and that this isn't indicative of a dying cam.
 
#5 ·
Oh boy, that is awful. Sad that cars get abused and receive no maintenance , then get dumped onto the next guy.
 
owns 2018 BMW 540i x-drive
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#9 ·
Symptoms

Hey guys, I think I posted my previous question about how you resolved this issue on the wrong thread. I see you resolved the issue by selling the car.

I am curious when you say your engine was "going to detonate" do you mean it was going to start to experience detonation? Or it was literally going to explode lol? It seems like there are a handful of things you could do to cope with or fix detonation without replacing the entire engine.

It seems like in OP's case the 28A0 code could have been related or unrelated to the underlying damage to the camshaft bearings. Someone feel free to correct me if I am wrong. I am not a master tech but I am assuming camshaft bearing issues could cause timing issues which in turn could cause detonation. Or is OP suggestion camshaft bearings were going to fail and wind up with exploded bearing metal inside of the engine causing total failure? If this was the case, why not just replace the camshafts?

Thanks!
 
P
#13 ·
ttomsauto471952 said:
2013 BMW X5 335i I replace both Vanos intake and exhaust run smooth but I'm getting code 28A0 but runs good no problems I even change oil and filter does this mean my cam bearing are bad or could it be my POV Val runs quietly smooth
Click to expand...
My car also had the same code and was running "normal". My indy did a through cleaning of the vacuum accumulator/lines when he had the valve cover off because I thought I had a leak but didn't. Code is now gone and the car idles/pulls smoother.
 
#20 ·
please bmw intelligent anyone!!!!!! ive been ripped off and spent 8,000$ in unessary parts like new dme new wire harness s new sensors etc.... on top of 5500$ shop charged me to swap my blown engine with ghasson auto remanned 5500$ engine i also bought and car still not right with these 2 codes no one can figure out ! 28a0 and 3106 , no catless downpipe installed so 3106 code really confusing every mechanic !
 
#21 ·
car has a jb4 tuner installed , catted down pipe to full exhuast, air intake , after market blowoff valve , car also upon hard acceleration , around 5k rpm, car will shutter and go into reduced power mode????? ive replaced boost selonoid with bmw genuwine , jb4 tuner is on 0 map which is factory mode , when car is in reduced power mode you can floor it and boost works correctly no shutter from car so wastegate is good . whats my issue ? new dme is not tuned professioally yet if that may be issue?someone please help !
 
D
#22 ·
Your issue is that POS JB4, I chased phantom errors for over a year before I finally pulled that piece of shyt.

And I don't care if it's on MAP -007 it's still causing problems down the Can bus as well as manipulating your TMAP, Map and boost solenoid...

Get rid of it... If nothing else unplug it completely and reconnect all the sensors to factory until you've confirmed you have other issues...

Best day of ownership of the JB4?? The day I put the entire pos in my garbage can.
 
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