So you had it's brain reflashed.Given that I assume that adaptations were reset as well.
Reconditioned Valve Body isn't a guaranty that it's refurbished properly.
Does it lurch more when it's cold or warm?
When I used to have this issue,it was only when gearbox was warm.Now I have a slight kick during the first downshift when I drive it after it set overnight in subzero temps.
Check the MAF to throttle body intake book for tight connection.
I am wondering if the vacuum leak could cause something like that.
Guys mentioned that old spark plugs can have such an effect on the tranny behavior as well.
Quote:
Originally Posted by khizman
I'm really at my wits end here! I know there are some transmission people on this forum ! It's a ZF5hp19 box on a 530i.
Ill do bullet points for this :
- Previous owner has transmission rebuilt 8000 miles ago.
- The rebuilders do the box and TC exchange, do not open valve body.
- I get the car and it has a jerk going from 2-1 when slowing down really fast, it also jerks if I just sit on the brake pedal in drive, and go in manual mode from 2-1. I can feel the transmission shift it, its a really light jerk on idle. Theres also a jerk fromn 3-4.
- I think software, so I have it updated, no difference.
- I then take it to the people who originally did the rebuild, they have no idea and say its functioning fine, they're too far from me to go again so I just leave it, they do admit they didn't open or clean the valve body, just put it back in.
- I then have a reconditioned valve body put in. This fixes the 3-4 issue but the 2-1 jerk is still present.
So now whenever I brake hard I get a thump from the back.
The suspension has been checked a billion times, it's definitely transmission related this one.
Big sigh.
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