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I don't know very much about throttle bodies and stuff, but I do have an interesting question: I just bought a 2000 BMW 323i with the M52TU engine. It would seem that this specific year does not have electronic throttle control, so retrofitting cruise control to it would either be a complete overhaul of the system or completely impossible. (I'm not a car expert, so please correct me if I'm wrong here.)

My question is, does anyone know if it is possible to retrofit cruise control to this car? If so, what would it entail? If not, does anyone have a spare foot?

Jokes aside, any input is much appreciated!

Jacob
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As you say, the M52 engine does not have an electronic throttle. However, the M52 was available with cruise control, so retrofitting the BMW system will be the neatest solution (as a bonus, you'll get audio controls on the steering wheel!).

BMW actually produced a standard kit for dealers to retrofitting cruise control, which makes your life easier. This thread should have all the info you need for your M52: http://forum.e46fanatics.com/showthread.php?t=618671

I've read some conflicting reports about whether a re-code of the ECU is required, but these instructions says it isn't, so fingers crossed...

SimpleSimon
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There are actually choices for you out there. I'm not sure if these exact Universal Cruise Control units would work, but it should give you some ideas:

Rostra Universal Electronic Cruise Control 250-1223

Another possible option:

Audiovox CCS100 Universal Vacuum Cruise Control

A buddy of mine installed one on his car (older Nissan) and it worked perfectly for what he wanted.

Pᴀᴜʟsᴛᴇʀ2
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Belive me or not, I installed on my e39 520i 97 m52b28 engine cruise control. It took me really few days maybe about week- to sort out all items you need. Cruise control UNIT,MFL sterring unit if your sterring wheel is before 07.97,cruise control acutator with linkage, power on button on dash(dependes), and few good meters of diffrent colour cables. If you lacky enough you get wires from scrap yard /if not plugs for them will be great. I have an sterring wheel with heater element from 96 7series which doesnt have MFL control unit on it - so I had to do lots for wiring - BUT is possigle to make it working.

Then If you sort this out check for any problems via INPA remove all faults, and you need to code it - NCSEXPERT so the icon of CRUISE ON/Off will work on Instrument Cluster.

Good Luck!! Marcin

Marcin
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