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sprinkles08
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 21602
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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It wont start : yes : battery is good turns over but wont

Customer Question

it wont start
JA: Does the engine turn over? How old is the battery?
Customer: yes
JA: Tell me a bit more about what's going on so he can help you best.
Customer: battery is good turns over but wont start
JA: Are you hoping to fix this yourself?
Customer: yes
JA: Great! What have you tried so far?
Customer: well i checked to see if my fuel pump is working
JA: Is there anything else the BMW Mechanic should be aware of about your BMW?
Customer: and im getting gas
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the BMW Mechanic about your situation and then connect you two.
Submitted: 6 months ago.
Category: BMW
Expert:  Steve replied 6 months ago.
Hello and welcome,
My name is ***** ***** it will be my pleasure to assist you today.
What question did I have about this? What info can I provide for you?
Customer: replied 6 months ago.
Hi, i have a 2011 bmw 328 and it does not start
Expert:  Steve replied 6 months ago.
I understand. What do you want to know about this? Possible causes?
Customer: replied 6 months ago.
The car turns over, the battery is good. i checked to see if im getting fuel and i am. i also checked to see if i was getting signal from the CKP sensor and i am. there is injector pulse. Im getting a code for the cam sensor intake and cam sensor outlet
Customer: replied 6 months ago.
I checked codes for immobilizer and there is a code but its related to the starter
Expert:  Steve replied 6 months ago.

what is the code

Customer: replied 6 months ago.
I know i have injector pulse because i scope the signal and its there and the scope the ckp and signal is normal you get a square wave
Expert:  Steve replied 6 months ago.

what is the immobilizer code?

Customer: replied 6 months ago.
im trying to see if i have it here
Customer: replied 6 months ago.
a0b4
Customer: replied 6 months ago.
the cam sensor codes
2a9a and 2a9b
Customer: replied 6 months ago.
the a0b4 code is in the imobilizer code
Expert:  Steve replied 6 months ago.

I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.

.

thank you for your attention to the rating requirement.

.

I would replace the cam sensors and vanos solenoids - this is a common issue.

.

.

Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.

Customer: replied 6 months ago.
i replaced the intake and exsauth cam sensors already
and i still get the same codes. i removed the spark plugs and the are wet with gas so that also tells me that i have gas from the injectors
Customer: replied 6 months ago.
wow
Expert:  sprinkles08 replied 6 months ago.

Hello and welcome to Justanswer!

Do you still need help?

Customer: replied 6 months ago.
I don't think I resolved anything with my last question and answer
Expert:  sprinkles08 replied 6 months ago.

Were the codes cleared after the sensors were replaced, you tried to start the engine and the codes returned?

Customer: replied 6 months ago.
I cleared the codes after I replaced the intake and ex sensors tried to start it and they cane back
Customer: replied 6 months ago.
I tested the wires going to the coil and I have power and ground and the signal seems to be there
I tested the wave form from crank and seems fine
Customer: replied 6 months ago.
I get a square signal as you can see I tried sending you a video but it's long
Expert:  sprinkles08 replied 6 months ago.

Do you have a compression gauge?

Customer: replied 6 months ago.
compression is good don't have the reading but yes. The car was driving ok and then it just didn't start the next morning.
Expert:  sprinkles08 replied 6 months ago.

How do you know compression is good without test results?

Customer: replied 6 months ago.
I tested the compression I have the results but not where I'm at I don't want to tell you the numbers but I did test the compression
Customer: replied 6 months ago.
I don't want to tell you the wrong numbers
Customer: replied 6 months ago.
It's what I meant
Expert:  sprinkles08 replied 6 months ago.

The test was done after the no start condition appeared?
Are you able to get the results and post them here?

Customer: replied 6 months ago.
first thing I checked were codes. Got 2 codes for cam sensor and not vanos solenoids.... I checked to see if I had injector pulse and scope the signal and there is signal I scoped the crank sensor and signal seems fine I replaced the cam sensors cleared the codes and they came back... So I made sure my compression was good and it was.... I have never seen a no start issue with vanos solenoids I have seen misfires or noise but not a no start. So I checked to see if maybe I'm missing something. I ruled out the security or key being an issue since I'm getting signals to injectors and crank
Expert:  sprinkles08 replied 6 months ago.

If you're still setting cam sensor codes then you either have a sensor wiring issue or improper cam timing. I'm trying to determine what compression is to try and get a better idea of cam timing.

Customer: replied 6 months ago.
Cyl 1
Customer: replied 6 months ago.
Cyl2
Customer: replied 6 months ago.
Cyl3
Customer: replied 6 months ago.
Cyl4
Customer: replied 6 months ago.
I'll get u 5 and 6 in a bit I'm doing them now
Expert:  sprinkles08 replied 6 months ago.

You've got a definite internal engine issue there if testing is being done accurately.

Customer: replied 6 months ago.
Is there a special way to do it? I ok with working on cars but if you tell me I can do it the way you think is best
Customer: replied 6 months ago.
There is a tsb about the cam shafts but I don't know if that would cause it not to start
Expert:  sprinkles08 replied 6 months ago.

To check compression you would remove all spark plugs, crank with the throttle wide open and use a battery charger to ensure even cranking speed for all cylinders. I do believe you have a cam timing issue.

Customer: replied 6 months ago.
Cyl5
Customer: replied 6 months ago.
Cyl6
Expert:  sprinkles08 replied 6 months ago.

If you weren't doing the tests as I described in my last post then you'll want to go back and double check all cylinders. Your results so far definitely indicate either engine damage or improper cam timing.

Customer: replied 6 months ago.
I did, I went back and re did them all just to doble check and I had not sent you those 2
Expert:  sprinkles08 replied 6 months ago.

The results were the same as the first readings sent then?

Customer: replied 6 months ago.
Customer: replied 6 months ago.
Cylinder one reads about 100 cylinder 3 about 110 and the others higher and one is over 150 I think is 6
Expert:  sprinkles08 replied 6 months ago.

I'd recommend checking cam timing next then.

Customer: replied 6 months ago.
take the valve cover off and check the cams? How do the vanos work?
Expert:  sprinkles08 replied 6 months ago.

You can do a visual inspection of the cams but the timing cover is going to need to come off if you don't see anything damaged there.

A variable cam timing issue can cause a fault code but there is almost no chance of it causing a no start condition as they will default to a fixed position when the engine isn't running.

Customer: replied 6 months ago.
what do I do next?
Customer: replied 6 months ago.
Do I open it? Or how exactly you go about checking it next?
Expert:  sprinkles08 replied 6 months ago.

You can remove the valve covers if you wish, otherwise remove the timing cover and check cam timing to see if it has jumped.

Customer: replied 6 months ago.
I don't think e90 has a timing cover does it? I don't even think e46 has a timing cover
Expert:  sprinkles08 replied 6 months ago.

Do you have the VIN?

Customer: replied 6 months ago.
I'm pretty sure the valve cover has to be removed to see the cams and check timing
Customer: replied 6 months ago.
Vin
Expert:  sprinkles08 replied 6 months ago.

There are special tools needed to lock the crank and lock/check the cams. You can just remove the valve cover for inspection but without the tools to check timing you ma not be able to see anything.

Customer: replied 6 months ago.
I have the tools to lock the cams, I did a e46 complete engine and I have the tools needed to lock the cams.... I'm just trying to figure out how the e90 works and what I'm suppost to do and how
Expert:  sprinkles08 replied 6 months ago.

Go ahead and put the crank lock tool in, pull the valve cover and have a look at the chain and cam sprockets.