Welcome all 928 forum refugees!
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By GT6ixer
#9845
All great crops start first by sewing some seeds. So let me contribute to this 928 Farm by posting my first tech question.

As the title states in the last 6 months or so, my ‘84 (best MY btw) auto started to exhibit transmission slippage immediately and only after sitting overnight or many hours between driving. Get up in the morning, start the car, pull away and the car surges in rpm but barely moves and wont get out of first gear until about 5 seconds later. It will continue this behavior into 3rd gear. Once at speed shifts from 3rd to 4th are fine. Now the strange part. This behavior only lasts for about the first mile of driving then it shifts perfectly the rest of the drive. I would say maybe its related to transmission fluid temperature but since it only lasts a mile (or about 5 minutes after startup) I doubt there would be much temperature change correct?

Any ideas?

Thanks!

Nate
User avatar
By Daniel5691
#9850
Hello sir !
Is it possible that the ATF level is low?
I had an older car one time that did the same when low, just as you described. Might be a super easy thing to check first...
Thanks Dan
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By Mongo
#9886
You can check the ATF level cold by starting the car, then crawl under and take a peak at the reservoir. There are three levels. After 2 minutes of idling, put the car in reverse for 15 seconds, then drive for another 15, and back to park. The fluid level should be at the bottom line. This is a good start to determine whether you need to add.

After a 10-15 min drive, the level should be at the second mark or likely just below the top of warmed up. There is not much gap between the two top lines.

I have corrected an S4 at a cold level just by following the steps in the first paragraph. Good luck.
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User avatar
By SeanR
#9947
3 or 4 speed?

Must disagree on one point. '88 is best year. :)

Def check the fluid and if you've not done a fluid/filter change, that would be the first thing on my list to get done then report back. Even a couple quarts low will cause odd actions.
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User avatar
By GT6ixer
#11669
Thanks guys. I haven't had a chance to check the level but I need to soon. I think I jinxed myself with this thread. I went for a drive this past Sunday and after about 20 minutes it wouldn't shift out of 1st gear. Visited a friend few a few hours abd when I left it shifted fine all the way back home. It's in the garage now. Hope to get to it this week and will report back.
User avatar
By GT6ixer
#14107
Image

So got to checking the fluid levels per your guys' suggestions and it was about a quart low. It was simple enough to fill through the reservoir parked on a level surface and without jacks. I used a $7 quart pump adapter from AutoZone and filled it with some Lucas ATF fluid. Then took itfor a nice 20 minute drive to get everything warmed up and checked the level again and it was fine. I've been driving it for the past week and it shifts good now. This winter I'll go and do a proper fluid flush and filter change. Thanks again for the help and advice.
User avatar
By SeanR
#14137
GT6ixer wrote: Tue Sep 01, 2020 8:38 pm Image

So got to checking the fluid levels per your guys' suggestions and it was about a quart low. It was simple enough to fill through the reservoir parked on a level surface and without jacks. I used a $7 quart pump adapter from AutoZone and filled it with some Lucas ATF fluid. Then took itfor a nice 20 minute drive to get everything warmed up and checked the level again and it was fine. I've been driving it for the past week and it shifts good now. This winter I'll go and do a proper fluid flush and filter change. Thanks again for the help and advice.
That looks like 2-3 quarts low. Did you check it running?
User avatar
By worf
#14147
SeanR wrote: Tue Sep 01, 2020 9:50 pm That looks like 2-3 quarts low. Did you check it running?
What he said!
User avatar
By GT6ixer
#14175
Yes. I took that pick while it was running. I filled it up while the car was idiling to the 20deg C dot which is the bottom mark in the picture. It only took about a quart, maybe a quart and half. Since the cheapy pump I bought only reached so far into the quart of ATF, I opened up a second bottle and pumped some out of there. After I took it for a drive the level stayed at the 20deg C mark. When the car is shut off the entire reservoir gets filled up.
User avatar
By worf
#14178
GT6ixer wrote: Wed Sep 02, 2020 12:23 am Yes. I took that pick while it was running. I filled it up while the car was idiling to the 20deg C dot which is the bottom mark in the picture.
FYI: WSM directs a filling procedure that includes running it through the gears while filling.
User avatar
By GT6ixer
#14199
worf wrote: Wed Sep 02, 2020 12:47 am
GT6ixer wrote: Wed Sep 02, 2020 12:23 am Yes. I took that pick while it was running. I filled it up while the car was idiling to the 20deg C dot which is the bottom mark in the picture.
FYI: WSM directs a filling procedure that includes running it through the gears while filling.
While filling? Well crap that's a two person job now ain't it. I ran it through all the gears on my drive. Shouldn't that in theory push the ATF fluid everywhere it needs to go?
User avatar
By Shifted
#14221
Here is the page from the WSM for checking the level after a flush/fill. The temperature has a significant effect on the level.

In summary, with a cold engine:

1) Start engine and allow it to idle for 2 minutes.
3) Move the gear selector to each position and leave it there for 2 to 3 seconds.
4) Move the gear selector back to neutral or park and check the level with the engine idling.

The fluid level should be at the 3rd mark at this point. In your photo, it's the "20" mark on your reservoir. Remember, always check when the engine is idling and in neutral or park, and after it's been idling for at least a couple of minutes and after moving the selector through all of the gears.

You can check it when it's hot as well, but you're taking an educated guess at the transmission temperature at that point.

When we did this on my dad's 928, he operated the brake/shifter while I checked the level. It's much easier that way and safer (as long as your helper doesn't want to run you over).
Attachments
928 Check ATF Level.JPG
User avatar
By GT6ixer
#14329
Ahh good info. I did basically what that said. The difference is after my drive the level was still at the 3rd mark. Likely the ATF was hotter than when I filled it to that mark after it was idling from a cold start. So after the drive I probaby should have added some more to get the level somewhere between the min and max lines. I'll check it again when I get home from work.
User avatar
By GT6ixer
#14369
Thanks Sean. It does make a sort of thud you can feel when down shifting from 4th to 3rd on heavy acceleration. It has always done that since I've owned it, but not sure if that's how it is supposed to be or just how it is on my car. It's not concerning as it never got more "thuddy" in the 12K miles I've put on it thus far.
User avatar
By SeanR
#14395
GT6ixer wrote: Wed Sep 02, 2020 5:00 pm Thanks Sean. It does make a sort of thud you can feel when down shifting from 4th to 3rd on heavy acceleration. It has always done that since I've owned it, but not sure if that's how it is supposed to be or just how it is on my car. It's not concerning as it never got more "thuddy" in the 12K miles I've put on it thus far.
Key thing is you noticed the slipping and stopped driving it right then, checked what was wrong and fixed it. These things do not like to slip, ruins all sorts of internals.

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