BMW
2007 525i 5 series wants to start but does not. Had a misfire in 6 changed out all spark plugs and coils.also battery
Expert's Assistant chat
Customer: 2007 525i 5 series wants to start but does not. Had a misfire in 6 changed out all spark plugs and coils.also battery new
JA: Have you changed a battery before?
Customer: On this car first time
JA: Are you fixing your 525i yourself? What have you tried so far?
Customer: Yes myself might be ibs
JA: Is there anything else the Mechanic should know before I connect you? Rest assured that they'll be able to help you.
Customer: No
JA: Have you changed a battery before?
Customer: On this car first time
JA: Are you fixing your 525i yourself? What have you tried so far?
Customer: Yes myself might be ibs
JA: Is there anything else the Mechanic should know before I connect you? Rest assured that they'll be able to help you.
Customer: No
Answered by Steve in 1 min 1 year ago
Steve
Auto Mechanic
35,686 satisfied customers
Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs
Hello and welcome
Customer
Hi
The fist thing to do is try a second key and double check the fuel pump fuse if you have not done so.
If no luck, then this would indicate a lack of spark, or lack of fuel or lack of compression.
Lack of spark would commonly be a bad crank sensor, or problem with the ecu (engine control computer) or ecu power supply. Sometimes an anrti theft issue.
Lack of fuel would be a failed fuel pump, bad filter/pressure regulator or problem with the fuel pump power supply (relay if fitted, wiring, etc).
The most likely of the above would be a bad fuel pump, but additional checks will need to be made to verify.
If you are able you can try to carefully start the car using starter fluid spray. If it starts using this, then you have confirmed that you have spark and that the problem is with fuel supply.
You can also check for power at the pump and to see if it is running.
The most likely of all the above would be a failed fuel pump which would require it be replaced.
Customer
Wow that's a lot of possibilities
Customer
At first it was having problems trying to stay on then it just died try to restart nothing sound like it wanted to start nothing then I had a cold of them p0306 misfire 6 and a too lean Bank 2 code I replaced all spark plugs ignition coils I also change the battery but the new battery is lower than before the original battery was 900cc 1100 new battery 850 CC 1000and even with the new batteries something keeps draining the battery and it's not even running is there a way I can reset with the OBD 2 tool the ECU
Customer
I've checked all fuses relays fine I believe I used to hear the gas pump go on when I would first switch the key in the backseat but I don't hear it no more maybe the computer has some kind of shut off because of the battery thing I don't know
There is no ecu reset
Sounds like the pump isn’t running then because it’s faulty or not getting power
Customer
Well I guess I'll just go down that list of things you had mentioned starting I guess with the testing of the pump. Oh oh but another thing I disconnected the fuel line going to the I can't remember the name but gas shut out of it so it showed there was pressure in the line from the gas pump is that true or would it just be like that from
Customer
I just remembered the line that leads to the fuel injectors had pressure
It could just be residual pressure or it could be insufficient pressure
Customer
Well in any case if the ECU was bad or something else with the electronics holding it show me a code on my obd2 toool
Customer
Okay got it this last one is my last question I know it's a little frustrating
No it probably wouldn’t show you a code on a basic obd scanner for any of this
Customer
I have a Bavarian Technic Professional Kit that should be arriving sometime this week are you familiar with that and would that be be a better tool to use
Customer
Thank you for your help I appreciate your time and patience
I’m not familiar with it
Customer
Okay thank you again
You are welcome
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35,686 satisfied customers
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Steve
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