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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Sep-19-2018, 10:48:29 PM   #1
BimmerDreamer
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Default Misfire Linked To Moisture

Months ago, I got some moisture in the trunk of my E46 M3. Perks of driving a convertible I suppose. Weeks later I got an injector stuck open.

The radio gets stuck on whatever channel and volume setting it was on when this happens. It can happen on pure humidity sometimes too. Blinkers don't work, doors don't lock, seatbelt sign comes on even when I am buckled.

Over the past few weeks, there has been rain in TX. Unfortunately, the drains in my convertible top compartment couldn't keep up (yet again). So, water flowed in through the convertible compartment and filled the spare tire area. Water also entered the battery compartment, but the level never got anywhere near the terminals.

A week after the rain passed, I still have some of these intermittent issues. I am not horribly concerned about them passing, as they always have. I drove it today and these problems only for a minute before the radio booted up and blinkers worked. (The plot is about to thicken)

I was driving at 10% cruising throttle and increased to 30% to move lanes. The car began to jerk back and forth. I have only had this problem one other time and it was after these electrical issues. Sure enough, the engine is missing pretty bad. Today I could barely get it to 45mph and it seems like it is missing on more than one cylinder.

I have tried: Disconnecting the battery (Terminals are spotless)
Calling my mechanic to read the codes (Results coming soon)
Cleaning drains (again) to prevent future issues
Posting on here for help
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Old Wed, Sep-19-2018, 10:55:02 PM   #2
mrgizmo04
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Default Re: Misfire Linked To Moisture

Run a bottle of HEET through a tank (can get it at walmart, etc). That should help dry out any water in the lines. Make sure you are not constantly getting "fresh" water in from poor draining or via fuel filler hose, etc.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Thu, Sep-20-2018, 12:07:29 AM   #3
BimmerDreamer
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Default Re: Misfire Linked To Moisture

Quote:
Originally Posted by mrgizmo04 View Post
Run a bottle of HEET through a tank (can get it at walmart, etc). That should help dry out any water in the lines. Make sure you are not constantly getting "fresh" water in from poor draining or via fuel filler hose, etc.

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Can do. As soon as I get a ride to wally world haha.

Is there anyway water could get in the tank?
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Old Thu, Sep-20-2018, 08:19:14 PM   #4
TrackRat951
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Default Re: Misfire Linked To Moisture

I'd check out the ignition coils, as well. On every German car that I've had, high humidity exacerbates failing coils.
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Old Sat, Sep-22-2018, 03:48:31 PM   #5
BimmerDreamer
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Default Re: Misfire Linked To Moisture

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Originally Posted by TrackRat951 View Post
I'd check out the ignition coils, as well. On every German car that I've had, high humidity exacerbates failing coils.
This is good to know! I just located the missing cylinder by disconnecting each coil and seeing which one wasn't affected. Cyl3 was the culprit, so I swapped the coil with cyl4 and the problem persisted. So I ordered a new coil. Will install today and I expect it will resolve the issue.
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Discussing Misfire Linked To Moisture in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)