12-23-2019, 09:29 AM | #1 |
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Transmission jolts while downshifting after fluid change very odd!
This past week I was changing transmission fluid since car has 70k and I do decent amount of towing so I though it would be a good idea. So I got the car on 4 ramps this way it's level, while doing the procedure I noticed few odd things; 1) while draining the old fluid, first I decided to loosen the fill plug ( wanted to make sure there's no problem braking it free before loosening the drain plug draining fluid and having no way to fill it back up if fill plug was sized) upon loosening fill plug about half a quart of fluid drained just from fill plug (it was gushing out when I took fill plug out not just dripping, which I though this was very unusual since per the manual there should not be oil above the fill plug if fluid level prior was at a correct level, this wasn't just small amount of fluid above the fill plug quite a bit of fluid came out just but undoing the fill plug about half quart or more, this seemed very odd to me. 2) Second upon draining the oil pan all off the oil that came out from oil pan and fill plug int total only 4 liters came out, which again seemed odd since transmission holds 8.7 liters and I only got 4, I know that most people get about 5 to 6 liters out since its impossible to drain all of it, but I only got 4! that less then half of total capacity. 3) When performing the fill procedure with ISTA (wraming up fluid to 30-40C going through all the gears reving to 2000 rpm for 30 sec ect) I was only able to put in 3 liters back into the transmission upon reaching required operating temperature, that 1 liter less of what originally came out. At this point started to get worried something is not right. Lowered the car took it for a drive around the block raised it back again and check the fluid again, upon undoing fill plug fluid was just slowly dripping out of the fill hole which per manual is at correct level, so I bolted everything back up, and rest adaptations as well for the tranny. But still have this filing something was very strange about this.
Did some driving past 2 days and I notice when coming to a stop when transmission is downshifting from like 3 to 2 or 2 to 1 theres this jolt happening now which was not there prior to fluid change, also when auto/stop function is on when you come to stop and release the brake car starts it there a jolt forward as well, which was not present before changing the fluid. Otherwise everything is normal up shifting is smooth and normal just like before. Has anyone experienced any of these symptoms before? At this point I'm just trying to pin point a resolution to this issue, did some googling but came up short By the way I used the ZF 8 fluid which is the same as factory and my car is X5 35d never had any shifting jolting issues before. Any pointers possible solutions greatly appreciated. |
12-23-2019, 11:40 AM | #2 |
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Was this the first time the fluid was changed? Seems very odd that do much came out of the full plug. I did my a while ago but didn't have this issue, my process was pretty straightforward. I would say to check the fluid again since you have driven it some. I did that in mine because I wanted to be sure it was at the right level. I believe there is a trans oil cooler that has a valve that opens at a certain temp level. There is a video on YouTube by Weberauto that describes the process for ZF transmissions. Hope you get it sorted out.
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12-23-2019, 11:52 AM | #3 | |
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12-23-2019, 12:41 PM | #5 |
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12-23-2019, 01:02 PM | #6 | |
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I'll take this time to say a big FU to ZF/BMW for not putting a damn dipstick in so we can fill the transmission from the engine compartment like a human and not under a 5300lb truck with the engine running and hot exhaust running right next to you like some deranged animal. Near 100K vehicle and they can't provide a way to fill the transmission other then to be underneath it while it spits in your face and the engine is running?!?!?!... /Rant off In general, ZF8HP70's & 75's with the standard plastic pan use approx 4.5 liters per oil/filter change. If you loosen the valve body another 1 to 1.5 liters will come out. If you are putting in more or less then this (+/- a liter) then something is wrong. Last edited by Sophisticated Redneck; 12-23-2019 at 01:08 PM.. |
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12-23-2019, 01:32 PM | #8 | |
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12-23-2019, 05:18 PM | #9 |
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Yes you're definitely low. Turn car on and top off the fluid. Wrap a towel around exhaust pipe so you don't burn yourself.
The transmission is hydraulically operated, and the pump sucks up fluid when it's running, and sends the fluid throughout the trans and the valve body inside. |
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12-23-2019, 06:30 PM | #11 | |
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And this does nothing but damage both BMW and ZF. Because of this marketing BS, the ZF will face unusually high failure rates and will grow to have a piss poor reputation for being toss away transmissions.... All thanks to an fraud of a marketing campaign. I am at a loss as to the purpose of this marketing campaign...We purchase a BMW for it's amazing engineering and superior way they drive and handle...we become attached and enjoy them so much that most of us take great pride in maintaining a finely tuned machine, oil changes are at the least of our concerns and gladly excepted..Be done by your own hand or paying someone else, I don't think any BMW owner views it as a unnecessary task or inconvenience...rather the care and feeding of a machine we truly enjoy. These are not economy minded Hyundai's (I own both so I can say that. Last edited by Sophisticated Redneck; 12-23-2019 at 06:51 PM.. |
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12-23-2019, 06:37 PM | #12 | |
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12-23-2019, 09:20 PM | #13 |
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I recently did my tranny fluid change and it was doing the same as you described.. Now when you did reset the adaptations did you PROPERLY do the re-learn procedure? I forgot to do that and my car was downshifting roughly. Then after resetting it again and doing re-learn function it's performing much better. Keep in mind it may take up to 1000 miles for a tranny to properly adapt for your driving style etc.
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12-23-2019, 10:13 PM | #14 |
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Got home lifted the car again, recheck oil while car was running at designated temperature and sure enough it was low, got another 1.25 liters in the tranny while running. Now it should be fine at least the amount of oil I drained vs refilled now matches which is a good sign. Going to test drive it tomorrow morning to make sure everything works like it should.
Thank you to everyone who gave tips to resolve this issue 👍 much appreciated. |
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12-23-2019, 10:16 PM | #15 | |
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12-23-2019, 10:49 PM | #16 | |
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If you can't do this, the transmission will eventually relearn but take much longer to do so |
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12-24-2019, 08:51 AM | #17 |
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12-24-2019, 09:40 AM | #18 | |
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Was not aware of this procedure at all, will do, thanks again for all the help. drove it this morning and now everything seems back to normal, just need to re-learn adaptations and that's it |
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12-24-2019, 03:04 PM | #19 | |
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I pity anyone who would believe the marketing hype over the FACT that ZF themselves recommends you change at 70k. But go ahead and keep drinking that sweet sweet BMW Kool aid and believe someone in BMW marketing over the actual ZF engineers if it makes you feel better. Below is the official documentation from the manufacturer instructing to change every 50 to 75K. Last edited by Sophisticated Redneck; 12-24-2019 at 10:55 PM.. |
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12-24-2019, 03:09 PM | #20 |
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