x5 e53 4.4 misfire and rough idle
 

Hello everyone .. I have a problem with my bmw x5 e53 05 4.4i n62 .. That from a month ago there is misfire in cylinder 8,7,5,2 .. And after get the sysetm checked .. We found that ecu dosent give the injector any power .. So i changed the ecu and coded it .. Now only cylinder 6 and 3 have a misfire ., what i found that ecu give them an electric pulse and after 10 sec. The ecu read that misfire and prevent a pulses .. I tried to change the ignition coils and spark plugs .. But i think spark plugs arent good as they are not platinum .. I have checked the pcv valves all are good .. Please anyone help me ..

Plug wires or injectors maybe?

Quick test you can swap these around and see if the misfire moves with them.

I just went through this problem a month ago, p0300 was the code that I was constantly getting and every time I cleared the codes I would get different cylinder misfires, after about 2 months of reading on the Internet I found out the early n62 engines have an intermediate lever issue (part of the valvetronic system) I literally did everything you wrote (plugs, coils and even changed the ecu) but my indy replaced my eccentric shaft and intermediate levers and it fixed my problem.

Also forgot to mention don't let it run too long while it's misfiring or you'll end up with a bill to replace your catalytic converter too. Also if you own inpa you can adjust the valve lift to the highest setting and this will confirm if you have worn intermediate levers.

What part of the engine is this please? "replaced my eccentric shaft and intermediate levers"

http://realoem.com/bmw/diagrams/r/q/131.png

Part number 5 is the intermediate lever i believe there are 2 per cylinder so 16 in total.. You may or may not also need the Eccentric Shaft replaced but you will only know once you open up the valve covers (good time to do valve cover gaskets if not done yet)

The Eccentric Shaft is the one with the gears on it.

Thanx in advance x5moe4.4 ..
Okay i will tell my mechanic for checking the engine under the valve gasket .. But how u detected that the ecentric is tje prob.??did it have any sign to know if that okay or not???

You should have a service engine soon light on.

Also if you unplug the maf the rough idle should settle down a bit because it pretty much deactivates valvetronic. Also learned that our trucks don't have traditional throttles and the throttle is pretty much the valvetronic system so once basically once those parts wear out the misfires and rough idle starts.

I copied this and saved it from somewhere. Here are some of the details to help determine if your intermediate levers are an issue.


"Several 4.4L engines have experienced this issue whether in a 5 or 6 series. Probably something that should have been detected early on and at least one SIB (service bulletin on it). Maybe due to running some length of time with the misadjusted valve/lifters you may have had additional damage hence more parts than usual. But again, several have had their top ends rebuilt. SIB here: SI B 11 02 05 Engine January 2006 Technical Service This Service Information bulletin supersedes S.I. B11 02 05 dated May 2005. designates changes to this revision SUBJECT N62 Engine - Rough Idle, Misfire Faults after Cold Start MODEL E53 (X5 4.4 i/4.8is); E60, E63/64, E65/66 with N62 from 06/04 up to 02/05 production SITUATION Customer may complain of erratic engine idle speed lasting for approximately 20 seconds after a cold start. Check Engine Soon light may be illuminated and misfire faults for various cylinders (e.g. FC 2742, 2743, 2744, 2745, 2746, 2748, 2749, 274E) may be stored in the DME. CAUSE Incorrect tolerances and geometry of Valvetronic intermediate levers are causing uneven cylinder filling during the transitional cold start period (60 seconds after the engine has been started) when the Valvetronic system is switching from the initial 6 mm to a minimum 0.3/0.8 mm valve lift. CORRECTION On a customer complaint basis, and after performing diagnostic procedure described below, replace the Valvetronic intermediate levers. PROCEDURE Perform basic engine diagnosis (compression, ignition, fuel pressure, etc) to rule out other potential causes. Allow the engine to cool down. Connect GT1/DIS loaded with CD 44.0, or higher, to a cold vehicle (coolant temperature below 30 deg C) and from the Function Selection select: "Service Functions", "Drive", "Engine management ME9", "Test runs" and then "Tolerance test, intermediate lever". Start the engine and follow-up the test plan. Observe rough running values when idle speed stabilizes. If values are in excess of +/- 2.5 accompanied with noticeable engine vibration (and sometimes Check Engine Soon flashing), then remove valve covers on both banks. Look for the intermediate lever production date (stamped on the lever, next to the smaller roller contacting the eccentric shaft). If the production date is in the range between "04 180" and "04 324" (e.g. day 324 of the year 2004), then the whole set of intermediate levers (16) has to be replaced. The same classification of levers must be used when ordering the intermediate levers (classification number is stamped below production date). There are 5 classifications of levers used in the N62 engine. Note: In an individual cylinder head, all levers must have the same classification, but two different classification of intermediate levers may be used in one engine (e.g. bank 1: classification 2, bank 2: classification 3). Important: The lower production range of the affected intermediate levers is only an approximation. It is possible that levers produced prior to "04 180" (but not earlier then "03 363") may have certain deviations in tolerances. For Valvetronic intermediate lever replacement procedure, refer to RA 11 37 012 (bank 1) and RA 11 37 014 (bank 2), found in BMW TIS. IMPORTANT: Improved intermediate levers are currently available from our Parts Department. In the event of a reproducible customer complaint proceed with the diagnostic and repair procedure. There is no need to contact Technical Hotline. PARTS INFORMATION Part Number Description Quantity 2 / 4"