E39 misfiring Cyl #6 - BMW Forum

arush21393 · 09-12-2012, 08:52 PM

Any help is appreciated....

I have a 2001 530I and for about two weeks I have been having this problem. My engine check light comes on and when the code is pulled it's saying misfiring #6 cylinder. Here is what I have done........swapped plug connector, had tune up, replaced gas filter and MAF, had a compression check on #6 cylinder (that was good) had the injectors checked (they are good). With all that I have done I'm still getting the same code and message after clearing it. If someone who has had this problem can tell what else I can do that hasn't been done. I would appreciate it. My next move is to take it to the dealer and have the computer flashed. If there isn't something else that can be done.

Any and all suggestion will be helpful.

Thanks!

Lord Vader · 09-13-2012, 12:47 AM

A misfire is usually spark related. You said you swapped the plug connectors, but did you swap plugs? If #6 is miss firing swap it with one from #1 or 2 and see if it goes away. If it persists, then its not the spark plug. Did you have your plugs changed recently? If the plugs werent torqued down properly that can cause issues, including a "knock" sound or a ticking.

arush21393 · 09-14-2012, 05:03 AM

Lord Vader thanks for your response.

Just had a tune up on 9/7/12 (all spark plugs was changed to OEM that BMW callout for) and after I drove for 30 miles check eng light came back on. At this point this problem has me scratching my head and wondering what is wrong. As I stated previcously my last resort is to have the computer flashed at the dealer. by chance do you or anyone know how much it cost at the dealer to have computer flashed?

Lord Vader · 09-15-2012, 01:33 AM

I dont personally thing having it reflashed will fix it, and they will probably charge several hundred dollars. Have you yourself checked the plugs? Have you checked the torque? It is possible they didnt torque them down properly.

arush21393 · 09-16-2012, 06:44 AM

The work was done by someone I know and trust. And yes properly torque. So I don't know whatesle it could be.

Lord Vader · 09-17-2012, 12:49 AM

Just to make sure, is their only one code being displayed? Have you ever had your VANOS seals replaced? Several owners mentioned this being a probable cause. Flashing the ECU cam be a solution, but as you mentioned its usually a last resort, so just trying to help you find the most likely, and cheapest solutions.

Here is some helpful links:

Rough idle at start - after 2+ days of no driving - Bimmerfest - BMW Forums
How do diagnose a sudden and disturbingly unsettling cold-engine misfire (vanos?) - Bimmerfest - BMW Forums

arush21393 · 09-17-2012, 09:07 AM

Only one code and that is p1352. No have not had Vanos seals replaced. Any ideal how much they cost to replace? I appreciate all suggestion that could help solve my problem.

Lord Vader · 09-17-2012, 05:51 PM

The specific code helps narrow down the issue. That code is:

P1352 Misfire During Start Cylinder 6 (BMW)

Can you feel the car missfiring? And have you swapped the coil packs themselves?

arush21393 · 09-18-2012, 08:59 PM

Yes I can feel it misfiring and yes I swapped the coils to see if I would get a different code. But Same code/message. I notice that when it's misfiring if I stop and turn car off for 15 sec and restart the misfiring stops for the duration of the drive and sometimes for the next start also. Also when I clear the code the car runs very smooth until light/code comes back.