tobination

I've trawled through a few threads but couldn't find this problem apologies if it's elsewhere and thanks if you can point me to it.

I'm in New Zealand and have recently installed UPD s/c pulley, belt wrap kit, (thanks @Shardul) and had a custom retune. Also rear mufflers and secondary cats deleted, K& N filters installed. Dyno'ed at 560hp flywheel (475 rwhp). So far so good.

BUT within 24 hours completely lost go forward, ie car slips out of gear and has to be turned off and on to get a brief period of in gear drive. Trans fluid was changed for Mercedes Benz new fluid (seen that in another thread). Car effectively dead in the water, but after reset will be driveable so long as you don't accelerate hard, which is quite difficult and nerve wracking.

Errors and error codes include:
ESP failed
Speed implausible for gear/ gear slipping
An SBC error - and similar sorts of traction/brakes issues.

Gearbox seems (?) to be ok. A Merc technician is working through codes, but the last time we only drove 500m when it all fell over again. Tuning guy is also on the case, but I'd love to hear from anyone else who can point me in a more certain direction. Or at least eliminate some angles.

Thoughts? Thanks.

billy smart

Definetly sounds like trans. problem. Possible speed sensor fault?

tobination

Thanks for the tip. Looking for speed sensor I found this thread which certainly sounds similar.

https://mbworld.org/forums/w211-amg/...roblems-2.html

Only other bit of relevant info (maybe) is that after some investigation with the workshops doing the dyno, it sounds like they weren't using dyno mode, just ESP off. Wondering if that has stuffed something up.

Hulk

Sounds like your conductor plate

DVC

Try taking the car back to the tuner so he can return certain torque settings.

tobination

Problem was the radiator - coolant in the transmission. Solution was new transmission (and external trans oil cooler!). Sigh!

Hulk

2003 was notorious for that, sorry you needed a new trans

03svtkiller

Been there done that! I know the feeling bro it sucks, had I known that this was a known issue, I would of never bought an 03... But after you fix it no worries.. Good luck