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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Water Pump Survey - Died or Not?



View Poll Results: Is your original water pump dead or alive? at what mileage?
Still working; < 60,000 miles 159 31.30%
Replaced with least than 60,000 miles 54 10.63%
Still working; 60-75,000 miles 66 12.99%
Replaced between 60-75,000 miles 39 7.68%
Still working; 75-90,000 miles 70 13.78%
Replaced between 75-90,000 miles 31 6.10%
Still working; 90-105,000 miles 34 6.69%
Replaced between 90-105,000 miles 10 1.97%
Still working; 105-120,000 miles 17 3.35%
Replaced between 105-120,000 miles 8 1.57%
Still working; 120,000+ miles 11 2.17%
Replaced with greater than 120,000 miles 9 1.77%
Voters: 508. You may not vote on this poll

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      02-22-2013, 02:58 PM   #1
Artmasterx
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Water Pump Survey - Died or Not? (Everyone Vote!)

I saw a similar thread that was specific to the N52 engine, so let's open it up to the whole crowd. I tried searching but didn't see a similar poll. N52 guys/gals, definitely respond to this poll as well.

N52 thread here: http://www.e90post.com/forums/showthread.php?t=725313

Many of us are starting to get well into the range where they start to fail, so let's get some statistics.

Feel free to comment if you have a engine power mod, as that could have an effect on the failure rate.

If you had it replaced, feel free to reply with the cost and whether it was dealer or independent shop.

If you replaced it as a preventative measure, feel free to post that too in the thread.

Mine has ~55,000 miles and is on the original pump.


If we end up with a lot of responses, I will try to make some graphs/stats and stuff and post them here at the top. Thanks!

[[[[ Update 8/28/2014 ]]]]
Everyone, I have compiled initial statistics based on 491 responses so far.

This gives the failure probability and the +/- 95% confidence intervals for that failure rate.

Everyone help out by voting!

Also, there will likely be a skew towards more failures given that many people with healthy water pumps may not check out the thread.

For those of you interested in the calculation details, I switched to a binomial-based distribution which is better for proportions:



Plot of estimated failure rate during specific mileage intervals:



Plot of estimated failure rate before a specific mileage (perhaps more interesting to some of us):

(I didn't really propagate the uncertainty correctly, so the uncertainty is probably larger at higher mileages)


Looks like there may be a lot of failures between 60-75,000 miles, and a relative lull in failures between 90-105k miles (though still uncertain). This could mean that some pumps fail early and other batches are more robust. However, it could also be a function of the heterogeneous sample of turbo/non-turbo cars, different driving styles, etc...

Still, predicting a 50% chance of failure before 75,000 miles kind of sucks!

Interesting nonetheless!

Disclaimer, courtesy of a fellow member. This analysis is not meant to encourage people to change there water pumps...
Quote:
Originally Posted by Efthreeoh View Post
Not to throw cold water on this whole statistics lesson, but I think the better data to make a statistical analysis from is time (rather than mileage) and type of use (i.e. percent split between city and hwy driving). The water pump fails due to the heat load it sees based on the environment it operates in. A water pump in car that sees more stop and go driving in Dallas, Texas will fail at a different mileage than a water pump in a car that sees no heavy traffic in Anchorage, Alaska. Tying failure rates to mileage, while you can make a statistical evaluation, is not a true measurement of predictability when a pump will fail as a result of mileage.

Also, throwing in N52s into the data set is going to skew the results because the water pumps for each engine are different parts. You should not be trying to correlate failure rates for two different models of water pumps.

Considering the high cost of replacement, it would be a disservice to members of this Forum to have them use this thread to decide when a preemptive replacement of the water pump should be made (i.e at 70,000 miles). Being that the cost for replacement is anywhere between $800 - $1,200 (non-DIY), it is probably better for an owner to wait until the pump fails and have roadside assistance insurance to handle the tow bill. A much better investment would be for an owner to buy a BMW-reading scan tool and periodically scan the car for the shadow codes that indicate the pump is starting to fail. Having been through this whole ordeal, this is just my opinion.
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Last edited by Artmasterx; 08-28-2014 at 09:11 PM. Reason: update of data
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      02-22-2013, 05:57 PM   #2
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my wp died at 42k.

Update: 3/13/2013 - Nice graphs.
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      02-22-2013, 06:23 PM   #3
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2008 BMW 335i  [5.00]
nice!
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      02-22-2013, 06:30 PM   #4
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mine still running strong at 101k miles...(knock on wood)
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      02-22-2013, 06:33 PM   #5
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Quote:
Originally Posted by omerfar23 View Post
my wp died at 42k.
That seems pretty unlucky
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      02-22-2013, 06:35 PM   #6
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At the dealer right now for what I believe to be the water pump. 46k but 6 months over on warranty, but if that's what they diagnose it down too, then I'll be sure to fight to get it replaced under warranty. The DIY seems pretty easy as a last resort and parts (including thermostat) run just under $600 from what I've seen.
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      02-22-2013, 08:20 PM   #7
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Died around 48 k .. Extended warranty cover it but still annoying .
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      02-22-2013, 08:31 PM   #8
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WP fail at 51.
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      02-22-2013, 09:09 PM   #9
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Quote:
Originally Posted by omerfar23 View Post
my wp died at 42k.
Mine too
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      02-22-2013, 10:00 PM   #10
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We need poll results for modded and unmodded cars.
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      02-22-2013, 10:08 PM   #11
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Died at 76k
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      02-22-2013, 10:21 PM   #12
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57K miles as of today going strong new pump in the trunk.
No mods except JB+ and I drive it pretty easy...
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      02-22-2013, 10:30 PM   #13
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Quote:
Originally Posted by Dozhdbog View Post
We need poll results for modded and unmodded cars.
It would have been nice, but I didn't want to have too many options. I think that tracked/non-tracked may be important too, but probably a relatively small amount of people really track their cars.

Engine power mods would be a legitimate question... maybe I will add a comment to original post.
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      02-22-2013, 10:55 PM   #14
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wp died at 89k.
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      02-22-2013, 10:58 PM   #15
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wasn't the design changed after 2006 or 2007?
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      02-22-2013, 11:34 PM   #16
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It would be interesting to see if those still working got a coolant flush at some point. My previous owner had the dealer do it at 36k miles. Must have been one of those "suggested dealer services".
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      02-23-2013, 02:27 AM   #17
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Wp died at 56k. Cost me $1000 at an Indy shop
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      02-23-2013, 03:46 AM   #18
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DEAD @ 64k in the cold. brrr
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      02-23-2013, 08:53 AM   #19
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I think 4 years is the average life of the WP. mileage really doesn't matter. I have seen WP forum fail at 14k on this forum
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      02-23-2013, 09:30 AM   #20
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Quote:
Originally Posted by omerfar23 View Post
I think 4 years is the average life of the WP. mileage really doesn't matter. I have seen WP forum fail at 14k on this forum
Nobody in this thread reported explicitely a WP failure on a 2007+ N52. There are some but much rarer than 2006 or N54.
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      02-23-2013, 09:33 AM   #21
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52K miles. Bone stock 2007 328i daily driver on original w/p and t-stat.
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      02-23-2013, 09:49 AM   #22
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2008 - 69k miles still good. I did a flush at 50k when I did the oil filter housing gasket. lots of black pieces it was not good.
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