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BMW 3-Series (E90 E92) Forum
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Water Pump Survey - Died or Not?
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View Poll Results: Is your original water pump dead or alive? at what mileage? | |||
Still working; < 60,000 miles | 188 | 27.53% | |
Replaced with least than 60,000 miles | 73 | 10.69% | |
Still working; 60-75,000 miles | 88 | 12.88% | |
Replaced between 60-75,000 miles | 49 | 7.17% | |
Still working; 75-90,000 miles | 85 | 12.45% | |
Replaced between 75-90,000 miles | 45 | 6.59% | |
Still working; 90-105,000 miles | 54 | 7.91% | |
Replaced between 90-105,000 miles | 17 | 2.49% | |
Still working; 105-120,000 miles | 28 | 4.10% | |
Replaced between 105-120,000 miles | 18 | 2.64% | |
Still working; 120,000+ miles | 21 | 3.07% | |
Replaced with greater than 120,000 miles | 17 | 2.49% | |
Voters: 683. You may not vote on this poll |
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02-22-2013, 01:58 PM | #1 | |
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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 6/22/2015 ]]]] Everyone, I have compiled initial statistics based on 559 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:
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02-22-2013, 04:57 PM | #2 |
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my wp died at 42k.
Update: 3/13/2013 - Nice graphs.
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02-22-2013, 05:23 PM | #3 |
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nice!
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02-22-2013, 05:30 PM | #4 |
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mine still running strong at 101k miles...(knock on wood)
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02-22-2013, 05:33 PM | #5 |
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02-22-2013, 05:35 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, 08:09 PM | #9 |
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02-22-2013, 09:08 PM | #11 |
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Died at 76k
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02-22-2013, 09:30 PM | #13 |
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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, 10:34 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, 07:53 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, 08:30 AM | #20 |
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