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#1 |
No more BMWs
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
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E90s suck.
At least the AWD ones do, as far as working on them. It's as though BMW went out of their way to make them difficult to work on (perhaps this was not accidental).
I happen to have one of these in the garage right now for what are some fairly basic repairs. A front lower control arm bearing (literally, a spherical bearing, not a bushing) failed. To replace the control arm, which has two attachment points, would normally be pretty easy. Remove the bolt holding it to the front subframe, remove the nut securing the outer ball joint, break the taper, and replace the arm. But because it's AWD, the nut for the outer ball joint is directly below the outer CV boot. That's annoying but not a huge deal - there's plenty of room to get a box wrench in there. Except BMW cast a "guard" into the knuckle that interferes with a typical box wrench AND the open end of the same wrench. You have to use a socket (and not an impact socket - a thin-wall, deep socket). Which means the axle has to come out of the hub. Simple stuff like the rear brakes - one of the suspension links interferes with a hex bit on a 3/8" ratchet when attempting to pull the slide pins. And the rear CV boot interferes with a socket and ratchet when removing the caliper brackets, so you have to use a wrench. And I guess everyone knows this, but when you replace a battery on one of these things, the battery has to be "coded" to the computer. Awesome. ![]() I feel a little better after ranting. ![]() |
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#2 | |
older fart than ZBB
Join Date: Oct 2003
Location: On the road again
Posts: 8,900
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2017 GMC Sierra 1500 SLE 2020 Fusion Titanium |
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#3 | |
195
Join Date: Oct 2003
Posts: 24,609
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The battery coding thing is so freaking weird. What happens if you don't do it? |
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#4 |
Hello.
Join Date: Mar 2004
Carmudgeonly Ride: '09 X3, '11 328xiT, '11 135i C, '17 c2, '19 X5
Location: Downingtown, PA
Posts: 5,531
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@JST, it over charges the battery causing it to fail early. Basically, it adjusts the charging cycle based on the learned performance of the battery.
@JV, I think it may be an AWD issue more than an E90 issue. I still haven't done the oil pan gasket on the e46 because the entire front drive system has to be removed.
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Josh (PA) - '19 X5 '17 991.2 C2 Cab '11 135i Convertible '11 328xiT '09 X3 |
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#5 | |
Doctor Mudgeon
Join Date: Oct 2003
Posts: 6,433
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Quote:
![]() Seriously though, oil pan gaskets are not things that are replaced often, if ever. I'd argue that control arms should be designed with some amount of replaceability in mind. |
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#6 |
No more BMWs
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
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Oil pan gaskets shouldn't need replacement often. Except... all but one BMW I've ever worked on has had a leaking oil pan gasket. Matt's 330i didn't have a leak there... but his E90 does.
The are some interesting engineering differences between the E90 and the E46. On the E46, the wiring harnesses around the engine generally clip to reinforcing ribs on the engine using simple stamped sheet metal clips that also clip to the wiring harness. They're beautiful in their simplicity. On the E90, the wiring harness has a clip that attaches to a stamped sheet metal bracket that bolts to the engine. Just another part that didn't really need to exist. I'm not opposed to complexity if it solves a problem... but from what I'm seeing on the E90, some of the complexity seems to be caused by lazy engineering. That bothers me. |
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#7 | |
195
Join Date: Oct 2003
Posts: 24,609
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So I still don’t get the battery thing. If the engine’s control computer is capable of reacting to the battery as it gets older, there shouldn’t be a need to “reset” it—if the car is reacting to the battery, it should react to a new battery differently than an old one, right?
The only way a “reset” switch makes sense is if the car has a linear map of some kind that it applies to battery charging. But that’s insane, since batteries wear at different rates depending on conditions. I think it’s a means of forcing you to go to the dealer for a new battery, pure and simple. EDIT: Ok, some googling yielded some additional detail: http://bimmertips.com/bmw-battery-re...ing-explained/ Here, the allegation is that if you don't reset the battery, the car will overcharge it, damaging the battery, because it will assume that the old battery is still in the car. But. Haven't cars had to deal with this problem since literally the day batteries were added to cars? Doesn't every car have to have a means of determining when the battery is charged, and not overcharging it? Why would the super fancy modern electronic IBS (which doesn't stand for irritable bowel syndrome in this application) be *less* able to do this than any other alternator? I will admit I'm not an expert on electrical systems, but this semi-plausible explanation raises more questions for me than it answers. EDIT TO EDIT: I'm with this guy. Quote:
Last edited by JST; 10-08-2017 at 09:28 PM. |
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#8 |
Crotchety
Join Date: Aug 2007
Carmudgeonly Ride: 22 Tiguan, 11 328i
Posts: 912
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Ugh. Really? Do you think it's an AWD thing?
An early model E90 is on my shortlist for my next car, but I want RWD and manual. I know you have had plenty of E46s, but isn't the chassis and evrything a step forward from the E46? What are the other frustrations with the E90? |
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#9 | |
No more BMWs
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
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Quote:
My brother's 328xi has been very reliable for them, so they can't be all bad. From what I'm seeing, though, I don't want to own one. Having said that, at just over 100k miles my brother's is starting to develop some leaks, I know the valve cover gasket was something he already had to do on it and it's a harder job than on the earlier stuff because of course it is. |
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#10 | |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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