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  #11  
Old 02-07-2019, 02:53 PM
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Quote:
Originally Posted by andrewwynn View Post
Vacuum leak won't cause a meltdown in performance. You'll get codes warning you you are getting bad efficiency.

If you get enough misfires in a particular cylinder, the brain will shut off that cylinder and your performance will go to hell instantly and typically stay that way until you clear the codes.

Try some full throttle acceleration runs and see if you get a misfire code. When this happened to wife's X5 last year it turned out to be bad plugs. It got so bad at the end she could only drive about 6 miles before having to pull over and reset the codes.

I would buy/rent a fuel pressure gauge and see if you are losing pressure at high Fuel demand, also if you get the errors on one or two cylinders, swap some coils and plugs so see if the problem moves.
Shutting down the engine and restarting the engine will clear the misfire counter in the DME (Or do you call it a ECU?). No need to get a code reader to clear the code.
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  #12  
Old 02-07-2019, 02:54 PM
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What caused mine to do that was water in the fuel in my opinion.

I put a bottle of heat brand water remover in it and it helped a bunch and replacing the fuel filter finished the fix.

I may of had all those codes you have but I know I had most of them. It was spewing codes like crazy. The heat stuff isn't going to hurt anything and is dirt cheap and it never hurts to change the filter which probably has never been changed before.

Cant guarantee a fix with this of course but none of these suggestions will hurt anything
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  #13  
Old 02-07-2019, 03:20 PM
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In the Midwest our fuel has heet built in in the form of 10% alcohol. Basically we have about 2-3 bottles of heet per gallon of gas. Humidity from the air will get sucked Into the gas tank as it empties so that can cause problems if the water isn't disolved into the gas to be consumed.
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Old 02-07-2019, 03:25 PM
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Quote:
Originally Posted by upallnight View Post
Shutting down the engine and restarting the engine will clear the misfire counter in the DME (Or do you call it a ECU?). No need to get a code reader to clear the code.


I was pretty sure a restart didn't clear my limp home caused from misfire. I was able to reset while driving and have it clear the code and limp mode
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  #15  
Old 02-07-2019, 05:06 PM
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Did this come on gradually or was it running fine and the missing started all of a sudden?
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Old 02-07-2019, 06:51 PM
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On a side note my codes came back after a drive this morning but the car ran great. Maybe a bit of a misfire on first cranking it but otherwise great.

The misfire and lean were the only codes this time but again the car drove fine.

I tested for fuel pressure and its perfect so I guess I have a vacuum leak. Didn't want to leave my "its fixed" comment without noting still having issues.
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  #17  
Old 02-07-2019, 06:54 PM
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I would suspect dirty injector over a vacuum leak if you are getting lean code and misfires.


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  #18  
Old 02-07-2019, 07:00 PM
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It could be injectors but on all of the bmw's I have fixed this on its been air flow meter or vacuum leaks so far.

Also it only does the misfire on first crank up. If I clear the codes while driving the only thing that comes back is lean codes on bank 1 and 2 no matter how far I drive it.

Drives great just the codes. Remember this the same car that had this for an intake boot on it.....
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  #19  
Old 02-07-2019, 07:02 PM
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Also it has a k&n air filter. So if the same intelligence was used oiling that filter that did that intake boot repair I can just picture how bad the air meter got hosed down with oil.

Numbers look good on the scan tool for the air meter so far though.
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  #20  
Old 02-07-2019, 07:34 PM
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#13 Fraking Corn Syrup.......

I miss MTBE gas. It's been so long I cannot remember the specifics, but fuel economy and power was so much more nicer on MTBE gas. Yes, I know there are places that sell race gas - Not looking to go that route.
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