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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-11-2012, 03:05 PM   #21
Dedney
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Join Date: Mar 2011
Location: Baton Rouge, LA
Posts: 49
My Ride: 325i
Well, 2 months later, & I'm still trying chase this problem down.. This morning, I finally decided to go have someone look at it. It's a local guy that specializes in BMW/Mercedes. I've been told this dude is as honest as they come & charges next to nothing to diagnose it..

So far, I've replaced the fuel filter, 6 plugs, 5 coils, and the blower motor resistor. I was hoping any of that would've helped. Nope. I'm still getting the code for misfire on different cylinders. So, today, I thought I'd swap coils one last time to see if it would follow the coil.

I pulled off coil #5 & saw the coil full of what looked like water drops! I looked down into the plug hole & saw water surrounding the plug! I checked cyl #4 & that was dry. I moved over to #6 & that one was worse! The pug was completely submerged under water! WTF!!!

I don't know much about motors, but I'm assuming that there's not supposed to be water down there, right?? I did go to the car wash this morning & pressure wash the car. I never opened the hood & washed the engine comp. though!

Any help/advice would be greatly appreciated!!!
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Old 02-12-2012, 02:18 AM   #22
LivesNearCostco
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I once read a tech talk article or something that said some hood or window drain hose can fail and dump water onto the engine if it's raining heavily. But I'm pretty sure that story was NOT about the E46. Still you could dry it out, go pressure wash your car, and then check right away to see if the coils got wet again.
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Old 02-12-2012, 09:24 PM   #23
Dedney
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OK, it's all been vacuume'd out & the coils put back on. I started it up & damn, if it doesn't run better!

Here's what I think has been happening:

Back in Oct, when I initially had the problems, I took those plastic engine covers off. Well, those covers have been off since then! This car has been sitting out in the rain while I'm at work, and it's been through plenty of car washes too!! Hell, I'm surprised it ran w/ all the water it's been taking in!! lol.

So, yesterday, after test driving it, I got home & put those plastic covers back on. If anything, those will divert the water off of the engine..

Thanks LivesNear..
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Old 02-13-2012, 12:02 AM   #24
LivesNearCostco
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Let us know if that solves it! If problem happens again after rain or car wash, I'd still check out your windshield drain or cabin air filter housing or whatever it is that might drain water onto your engine if it's missing, disconnected, or blocked.

What did your local BMW/Mercedes guy say?
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Old 02-14-2012, 06:00 AM   #25
Dedney
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Join Date: Mar 2011
Location: Baton Rouge, LA
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My Ride: 325i
Well, where do I start???
*
Saturday, I had the water issues.* So, I vacuumed all the water out & placed the boots back on the plugs.* I started it up & the check engine light went away & it ran awesome!* I drove it around all that day & a little on Sunday w/ no issues.* I drove it to work yesterday w/ no issues.* Driving home last night, the damn check engine light came on!!!* I got home & scanned it, & it said low coolant temp..* OK, no biggie, I can change out the thermostat..* So, I cleared the code & parked it for the night.* This morning, on the way to work, the check engine light comes on again & it starts running like crap again!!* I’m seriously about to run this thing into the Miss. River…* So, I get to work & scan it, & it says misfire – cylinder #5…* As I was driving here, it finally started running better, so I cleared the code again.* We’ll see what happens this evening on the drive home.
*
If it comes on again for one of the cylinders, I’m going to have to finally cave in & take it to someone else…* I’ve been spinning my wheels since Oct trying to chase this problem down & obviously, I’m missing something..
*
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