Misfires on Bank 1 - 02 4.6is

[johnqpublic99]

Originally Posted by upallnight

If the misfire is only at idle, but smooth out once the throttle is opened, then most likely you have a vacuum leak. Vacuum is highest at idle because the throttle plate is closed.

Real data (Short Term Fuel Trim) on Torque will show you if bank one is running lean compared with bank 2. If the Short term data shows a plus value that means the computer is adding fuel to the bank because the mixture is lean. If the number is negative, that means the bank is running rich and the computer is taking fuel away from the bank.

Learn to use Torque and report what the fuel trim data are for both bank.

Ok... I configured torque to show me the fuel trim for sensor 1 on bank 1 & 2 but for some reason only shows me the option for short term fuel on bank 1 only... the numbers vary continuously between +- 7 on both fuel trim when I'm running above idle. On multiple occasions, as I'm slowing down at a red light, sensor 1 bank 1 number goes really high (like +25)... coincidentally, as I stop at a red light, the component status window shows me falling into open loop "because of system failure" and the fuel trim goes to 0.0 on both banks. Once I get going again, I come back into closed loop operation and fuel trim numbers start showing up again.

One last thing... on the emissions readiness panel... everything shows ready except for CAT which is in not ready state.

DF

[johnqpublic99]

Originally Posted by bcredliner

MAF, CCV, OSV, throttle body or vacuum leak issues would not be limited to one bank. Injectors are individually grounded. The codes are ignition related and are on all four cylinders so it is highly unlikely there is an injector or coil problem. I suggest troubleshooting the camshaft position sensor for bank one.

I forgot to mention that I have another 4.6is available to me that I'm using as a parts car so as I wired some temporary grounds I also took the opportunity to change camshaft position sensor on bank 1 with a spare. Both had no impact but at least now using a test light, I do get my bulb to light up when using the engine as my ground.

DF

[upallnight]

Originally Posted by johnqpublic99

Ok... I configured torque to show me the fuel trim for sensor 1 on bank 1 & 2 but for some reason only shows me the option for short term fuel on bank 1 only... the numbers vary continuously between +- 7 on both fuel trim when I'm running above idle. On multiple occasions, as I'm slowing down at a red light, sensor 1 bank 1 number goes really high (like +25)... coincidentally, as I stop at a red light, the component status window shows me falling into open loop "because of system failure" and the fuel trim goes to 0.0 on both banks. Once I get going again, I come back into closed loop operation and fuel trim numbers start showing up again.

One last thing... on the emissions readiness panel... everything shows ready except for CAT which is in not ready state.

DF

With a fuel trim of +25 that means the computer is adding fuel to the mixture and since this is occurring when you are slowing down, the vacuum is highest since the throttle plate is closed. With that high of a fuel trim, the computer is setting a check engine light on.

Can you monitor the fuel trim at idle? If you can locate the freeze frame option in Torque it will tell you what the engine data were when the check engine light was set.

I would say that you have a vacuum leak. Scanner Danner has a great video on Youtube for locating a vacuum leak with just a bottle of water. Since bank one is showing a high fuel trim I would check out the intake manifold gasket along bank 1. You can also have the engine smoke tested.

As for the emission readiness, did you clear any trouble code? If you did you will need to drive the X multiple times to change the readiness status. I would work on the high fuel trim and worry about the readiness later.

[johnqpublic99]

Originally Posted by upallnight

With a fuel trim of +25 that means the computer is adding fuel to the mixture and since this is occurring when you are slowing down, the vacuum is highest since the throttle plate is closed. With that high of a fuel trim, the computer is setting a check engine light on.

Can you monitor the fuel trim at idle? If you can locate the freeze frame option in Torque it will tell you what the engine data were when the check engine light was set.

I would say that you have a vacuum leak. Scanner Danner has a great video on Youtube for locating a vacuum leak with just a bottle of water. Since bank one is showing a high fuel trim I would check out the intake manifold gasket along bank 1. You can also have the engine smoke tested.

As for the emission readiness, did you clear any trouble code? If you did you will need to drive the X multiple times to change the readiness status. I would work on the high fuel trim and worry about the readiness later.

Can't see the fuel trim at idle as it goes into open loop... found the youtube video so I'll give that a try tonight... smoke test would definitely be next.

yes I did clear the codes once I changed the o2 sensors... so I'll keep driving till the CAT readiness goes into READY state

DF

[upallnight]

Since you changed the02 sensors we can eliminate that as the problem for the engine going into open loop. The other item that controls whether the engine is in open loop or close loop is the engine coolant temperature. Engine coolant temperature has to be above 105F in order for the system to go into close loop. Torque allow you to add a gauge to monitor the coolant temp. If you haven't done that, configure Torque to include a coolant temperature on the display. Monitor the temp and if it doesn't go above 105F you may have a bad engine coolant temperature sensor.

[upallnight]

This is how the computer determine a drive cycle.

[johnqpublic99]

Ok

So I now have these codes stored:


P0011, P01341, P01343, P01345, P01347, P01349


They are related to misfires on Bank 1 (Fuel cut-off shut down by the ECU) and P0011 is timing advance too far


At this point, based on searches, there seems to be 2 possibilities:


1) The VANOS solenoid on BANK 1 is defective... this is a distinct possibility as the truck had not been driven for 2 years... I am making a tool to go remove the solenoid to inspect its operation... No 32mm socket I have found locally is deep enough to go remove it so I'm making one.


2) If it's not the solenoid, then it is likely the chain guides have deteriorated and the looseness in the chain is what's causing the timing to go too far advanced...


So far I have:


- changed the oil and air filter

- changed all four o2 sensors as they had never been changed so I suspected them initially

- I have a spare engine so I stole four coil packs from it and replaced all four on bank 1

- also stole the CPS off of the spare engine and replaced the bank 1 cps sensor

- replaced all four spark plugs on bank 1

- Had a smoke test done to verify no vacuum leak was causing the problem

- Verified the temperature sensor works and reports proper coolant temperature


Does it make sense the VANOS as being the culprit?



DF

[upallnight]

You could also have a bad cam sensor in bank 1. This guy fixed his P0011 problem by replacing the cam sensor.

http://www.bimmerforums.com/forum/sh...0#post27165230

[johnqpublic99]

I took the X5 on a flatbed to the dealer today for a diagnostic of my mysterious Bank 1 misfire issue and the service advisor called me with a "Sorry to tell you, but you need a new engine" as they found metal filings in the oil filter and refuse to do any other work as they don't know the source of those filings.

Could this be that the chain guides have disintegrated and the chain is loose and scraping against something?

DF

[upallnight]

Originally Posted by johnqpublic99

Ok... I configured torque to show me the fuel trim for sensor 1 on bank 1 & 2 but for some reason only shows me the option for short term fuel on bank 1 only... the numbers vary continuously between +- 7 on both fuel trim when I'm running above idle. On multiple occasions, as I'm slowing down at a red light, sensor 1 bank 1 number goes really high (like +25)... coincidentally, as I stop at a red light, the component status window shows me falling into open loop "because of system failure" and the fuel trim goes to 0.0 on both banks. Once I get going again, I come back into closed loop operation and fuel trim numbers start showing up again.

One last thing... on the emissions readiness panel... everything shows ready except for CAT which is in not ready state.

DF

Did you install the paid version of Torque Pro or the free version of Torque. If you installed the free version, some of the functions are disabled.