Question for Automatic trans?

[pilotnick1203]

Well I was having a fun time today in step mode... Until I noticed something odd. I lit into it in 1st gear around a corner (wonderful sound) until the car started lurching forwards and back violently. I looked at the tach and it was around 5400 rpm. Up shifted and it stopped. Is this a problem? Don't want to blow my trans before I get the manual all set up and ready to go.


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[johnrando]

Hmmm, fuel pump? Battery (you'd be amazed)?

[ELCID86]

Yeah I was reading a bit on "limp mode" and some pointed towards a new battery fixing that--strange.


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[stephenkirsh]

Was thinking of bushings, maybe differential bushings, but if it's really bad I doubt those would do it.

[pilotnick1203]

It was really abnormal to say the least


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[JKO_ZHP]

Never had that problem before. Currently at 117,000 miles and I use Steptronic a lot but it's always been smooth from M1 through M5.

[ELCID86]

How many miles on the tranny and fluid?

[pilotnick1203]

139800 on the auto and recent fluid change


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[ELCID86]

Did you do the drain and fill method? Just curios as to whether something could have gotten stirred up in there if it was a flush, etc.


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[ZHPasta]

When you noticed the jerking motion, were you letting off the throttle and/or feathering it?

[pilotnick1203]

Did you do the drain and fill method? Just curios as to whether something could have gotten stirred up in there if it was a flush, etc.


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I think European motors flushed it...


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[pilotnick1203]

When you noticed the jerking motion, were you letting off the throttle and/or feathering it?

Steady throttle


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[pilotnick1203]

Never had that problem before. Currently at 117,000 miles and I use Steptronic a lot but it's always been smooth from M1 through M5.

Very rough on mine...


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[JKO_ZHP]

I think European motors flushed it...


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What color was the fluid? I'd be worried not just for you but for myself if it was the trans. I do drive like a maniac according to my mechanic since he said that when he drained the transmission fluid, it was darker than my engine oil. He flushed it 4 times and it still wasn't completely pink.

Or maybe the differential? I had never done that before but I had it changed for the first time along with the transmission flush a few thousand miles ago. Immediately after, I remember driving just felt a little smoother.

[pilotnick1203]

What color was the fluid? I'd be worried not just for you but for myself if it was the trans. I do drive like a maniac according to my mechanic since he said that when he drained the transmission fluid, it was darker than my engine oil. He flushed it 4 times and it still wasn't completely pink.

Or maybe the differential? I had never done that before but I had it changed for the first time along with the transmission flush a few thousand miles ago. Immediately after, I remember driving just felt a little smoother.

I don't do maniac things but enjoy the sound at 5k rpm... I didn't take not of the color. It is leaking pink fluid now from the main seal I believe. Requires 1000$ job and pulling the tranny so I may throw a 6 spd in. Also going to put an LSD in from an m3


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[MrMaico]

Was thinking of bushings, maybe differential bushings, but if it's really bad I doubt those would do it.

I wouldn't be so quick to rule this out. I was thinking more like motor mounts possibly though. I know it used to happen on vehicles with a throttle linkage and bad motor mounts. It would probably be a good idea to check them all, engine, trans and diff.

[pilotnick1203]

I wouldn't be so quick to rule this out. I was thinking more like motor mounts possibly though. I know it used to happen on vehicles with a throttle linkage and bad motor mounts. It would probably be a good idea to check them all, engine, trans and diff.

Will check them all. Thanks.


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[ZHPasta]

Any update??

[pilotnick1203]

Any update??

Everything appears to be normal. Doing a 6spd swap from another ZHP transmission, will inspect even further under car.


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