I think the E53 can smell money... (Codes abound)

[270_BMW]

You guys posted like crazy while I was working today… so I opened a word document to reply to you all! LOL

Originally Posted by andrewwynn

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.

Sadly, I didn’t get time to run by the shop and get the smoke test done or fuel rail pressure done… Dad owns a full-service shop so thankfully I have access to anything and everything, just have to make time to get down there.

As I drove around town today in variable styles, getting down on the throttle and driving casually, nothing seemed to recreate the issues from yesterday. Clearing the codes and letting it sit overnight seems to have rooter the gremlins out for the time being. Back to the drawing board…

Originally Posted by upallnight

It's Bucking like an ISUZU Rodeo sold by Joe Isuzu because you have misfires with fuel cutoff. Shutting and restarting the engine does it run better? If it does you need to find out why you have the misfires.

The cat efficiency could be your Cat is going south and I don't mean Florida.

Sadly just shutting it off and then turning it back on didn’t fix it, even clearing the codes and letting it sit for five minutes and turning it back on still made it rough. But as mentioned above, letting it set overnight after clearing the codes worked for now…

Originally Posted by Crowz

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

I put a bottle of HEET with Seafoam in the tank two weeks ago before we had the cold snap come through to make sure I didn’t have any water in the lines, but good thought. Fuel Filter option still on the table…

Originally Posted by bcredliner

Did this come on gradually or was it running fine and the missing started all of a sudden?

Just came out of absolutely nowhere. I had some misfiring issues a little while ago due to a bad ground on my banks, but that’s the last I saw of anything.

[bcredliner]

Did it pop up just after the work you did?

[270_BMW]

Originally Posted by bcredliner

Did it pop up just after the work you did?

Nope. Hadn't touched a single thing for weeks and put a few hundred miles on it since I did anything.

[andrewwynn]

I've been getting codes again mostly just after a rough start. last time It was fouled plugs. Code on one cylinder repeatedly so I'm going to pull the plug and clean and swap the coil with a pull from a different car.


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