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Old 04-14-2019, 03:58 AM
tmaxx00 tmaxx00 is offline
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Engine mis-firing

I noticed recently when accelerating quickly or going up a hill in cruise that my 2009 328i has mis-firing. Yesterday it went from a few noticable misses to the check engine light going on and it sounded like a consistent change in fueling almost like a cylinder wasn't firing. About 5min later the check eng light went off and the engine fueling sounded fine. Any ideas what this could be? Could I connect an OBD scan tool to read out past faults.
The car has 94k miles. I'm not sure when the last tune up (plugs etc) was.
Thanks.

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Old 04-14-2019, 04:12 AM
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Doug Huffman Doug Huffman is offline
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You MUST "connect an (BMW capable) OBD scan tool to read out [ ] faults" if we are to diagnose your problems by remote control.

100K miles is a good limit on sparkplug life.
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Old 04-14-2019, 05:08 AM
tmaxx00 tmaxx00 is offline
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Quote:
Originally Posted by Doug Huffman View Post
You MUST "connect an (BMW capable) OBD scan tool to read out [ ] faults" if we are to diagnose your problems by remote control.

100K miles is a good limit on sparkplug life.
I'll get obdfusion and read out the fault codes, then report back. Thanks

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Old 04-14-2019, 06:02 AM
Dsnotgood Dsnotgood is offline
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Had this recently as well. My car has a sulev engine and Bmw replaced all coils and plugs. Is your car sulev? Prob need new coils and plugs to fix it
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Old 04-14-2019, 06:13 AM
Mark963 Mark963 is offline
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It's not uncommon to have a single coil fail on any make of car - I had a Toyota coil go around 50,000 miles and the V6 could barely make 40mph. That single coil was $150 at the local parts store - good to plan ahead. At 100K miles, it may just be time for a spark plug replacement, but likely that you have a bad coil in there.

E90's apparently had a problem with the Bosch coils that were originally used, so they suggest replacing all of them. At the time, they suggested Delphi replacements, although I've heard that current Bosch's are fine.

https://static.nhtsa.gov/odi/tsbs/20...58489-9490.pdf

There are number of videos on coil/plug DIY replacement.

Last edited by Mark963; 04-14-2019 at 12:00 PM.
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Old 04-14-2019, 11:41 AM
gbalthrop gbalthrop is online now
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Quote:
Originally Posted by tmaxx00 View Post
I noticed recently when accelerating quickly or going up a hill in cruise that my 2009 328i has mis-firing. Yesterday it went from a few noticable misses to the check engine light going on and it sounded like a consistent change in fueling almost like a cylinder wasn't firing. About 5min later the check eng light went off and the engine fueling sounded fine. Any ideas what this could be? Could I connect an OBD scan tool to read out past faults.
If a "misfire" is serious or consistent enough, the injector for the misfiring cylinder will be shut down by the DME to prevent damage to a catalytic converter by raw fuel being dumped through the misfiring cylinder. In your case, the rough running for a minute or so (how accurate is your "about 5min later" estimate ;-) is due to injector shut down on one cylinder. The SES light will go out and normal operation will resume in ~ one minute if the cause of the problem was intermittent "misfire."

If you have repeated "misfire" occurring at full throttle and usually higher RPM (>4,000), that suggests old plugs with enlarged gaps in the .050" range (original gap was .040"). Simply replacing the plugs (NOT coils) will probably correct the issue, particularly if you measure gaps on old plugs removed >.050" as stated, and more likely .055" to .060"

ANY generic P-code reader can read "misfire" codes. They are P0301 through P0306 with the last digit identifying the "misfiring" cylinder, one through six. If the SES light came on, ONE or more of those codes is almost certain saved in DME memory, and if you don't have ANY type of code reader, your local Advance Auto will read the code for free in 2 minutes. If you DO scan for fault codes, get Freeze Frame Data as well, particularly noting engine RPM and Load at moment fault was saved.

There ARE instances where you need MORE than a P-code reader (as in when there are fault codes saved in Modules OTHER than the DME or Engine Control Module). This is NOT one of those instances.

George

Last edited by gbalthrop; 04-14-2019 at 11:45 AM.
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