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BMW 3-Series (E90 E92) Forum
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335d weird transmission behavior
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07-19-2019, 09:48 PM | #1 |
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The tranny on my 335d likes to delay shifting from 2nd to 3rd gear a lot, even when the motor is fully warmed up, although sometimes it doesn't. This happened after replacing the valve seals (and making the stupid mistake of handling the mechatronic unit a bit roughly, since it was heavy). After this, I also replaced the SCR Metering Unit, since I was dealing with the OBD2 code P20EE (still hasn't been resolved yet) After a while, I decided to take the d on a couple of full throttle runs to burn off some carbon, and the day after that, it started to upshift from 3rd to 4th a bit roughly and/or delays it sometimes. Note: the kit I bought for the tranny maintenance had an aftermarket quality pan (CRP), (which I was not aware of at the time, until I found the same kit on FCP Euro) Any ideas on what I should do? Should I replace the pan with a ZF pan and do a fluid flush? Replace the solenoids?
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07-20-2019, 05:14 AM | #4 |
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I replaced all four valve body sealing sleeves, the adapter plug, and the mechatronic sealing sleeve. I'm sure I used the right amount, since I kept pumping fluid through the full hole until a slight stream came out from the hole. And I used Pentosin ATF1, which is an approved fluid.
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07-20-2019, 12:15 PM | #5 | |
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07-20-2019, 03:33 PM | #6 |
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Around 80K miles my car started having a bad 2-3 shift, usually when cold. 3rd was slow to engage and would sometimes rev up then bang 3rd when it caught. Dealer refused to service the trans. At 110K miles went to a recommended independent trans shop for the filter/pan, 4 megatronic sleeve seals, the main square seal and fresh fluid refill. I believe they used all ZF parts. Trans now is as good as new. They said even at that mileage there was nothing notable about the condition of the fluid and nothing significant stuck to the magnets or bottom of pan. I was charged $780. I found it refreshing the shop was very old school, service was authorized by a handshake, invoice written by hand. The building was the local Packard dealer in the '30's.
As others have said you need to top off the fluid with the engine running, warm, after running the selector thru all the gears. I wasn't keen on getting burned trying to do this on the floor of the garage thus went to the rare option of paying someone to work on the car. Last edited by kbsilver; 07-20-2019 at 03:40 PM.. |
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07-20-2019, 06:39 PM | #7 | ||
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07-20-2019, 06:53 PM | #8 |
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07-20-2019, 06:58 PM | #9 | |
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07-20-2019, 08:14 PM | #11 |
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No, since I've heard that once you reset the adaptations, you have to follow a learning procedure strictly, in which you need a long a** stretch of road to do this, otherwise the rough shifting of a freshly reset transmission will be detrimental to its life. (Heard this from FCP Euro) Not sure if this is necessarily true or not though. Plus, I don't have any software that can do that, and I'm not exactly good with computers when it comes to installing software as complicated as INPA
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07-20-2019, 10:28 PM | #12 | |
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what were the intervals at which you did trans oil changes ? |
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07-21-2019, 06:05 AM | #13 |
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I have the same delayed 2-3 shift. Up to and over 3000 prm's. Like you it's intermittent. I changed my seals and solenoids, and while I had the VB off, I installed the zip kit and new separator plate. I thought it was going to take only 6-7 qts of oil, but I ran out of oil before it started dripping. I'll warm it up this weekend and add more fluid, then reset adaptations. I'm at 145k miles and did a fluid/filter change at 122k miles. Hope it helps. I'm concerned because I had significant buildup on my magnets after 20k miles.
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07-21-2019, 10:11 AM | #14 | |
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Also bmw stinks the way they do partial fillup, TC holds a large amount of oil that doesn’t get changed, I usually do the flush three times until it becomes light brown ... this time I’m gonna take a chance and try the oil cooler line method, will circle back ... enjoy the d! |
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07-21-2019, 12:16 PM | #15 | ||
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07-21-2019, 03:13 PM | #16 | |
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I doubt a drop into a plastic funnel would damage anything in the valve body unless one the the solenoids was visibly misaligned. I had a partial fluid change at 60K miles (drain and refill without removing the pan). 2 years later I was getting a bad 2-3 shift, not the delayed 2-3 people are mentioning (for details scroll up in this thread to my previous comments). As indicated at 110K miles had the pan dropped, all the megatronic seals changed, new pan/filter and ZF fluid refill. This solved the bad shift issue. Shop mentioned there was nothing notable about the condition of the fluid, metal in the pan or on the magnets. If you are getting metal on the magnets, something else is probably going on. Unless you are extremely hard on the trans, 100K mile service interval while not the best idea, should not be damaging the trans. Last edited by kbsilver; 07-21-2019 at 03:37 PM.. |
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