Motronic 1.0 to 1.3 upgrade, broken down into steps.

Tue Jul 20, 2010 3:54 pm

As per other thread, I think I need to upgrade my 1987 325 to the newer 1.3 motronic.

I believe I now have all the parts to do so (Thanks to all here who helped) but would like to break it down into managable chunks so that I get it right with my limited skills!

The 1st step I'd like to tackle is changing the Crankshaft Pulley to the notched one.

Crankshaft Pulley
1. How do you remove the pulley? Is it the main bolt or the six smaller ones? Any tips on this would be good.

2. What else needs to come off to do the job? Do I need to remove the radiator or fan?

Tue Jul 20, 2010 4:55 pm

six small ones dude, cambelt is not disturbed so bonus !

rad and fan can stay.

those sensors not do the job ???

Tue Jul 20, 2010 5:03 pm

Hi Ant

Thanks for the pointers. Saves me some hassle.

Haven't received those sensors yet??

Tue Jul 20, 2010 7:24 pm

they were posted Friday dude.

big brown Jiffy bag, sensors inside are NEW

Tue Jul 20, 2010 7:38 pm

Could you put up a link to that Motronic up grade guide?
I want to upgrade my Tech 1 Sport to the later system.

Tue Jul 20, 2010 9:26 pm

Ant wrote:they were posted Friday dude.

big brown Jiffy bag, sensors inside are NEW

No sign of them yet?? did you send them recorded or courier?

Tue Jul 20, 2010 11:57 pm

Hi there,

Just did this myself, very straightforward job apart obviously from routing all the cables, but it's doable.

The sensors that need replacing are the oil ones (both pressure and level) and you need to add the crank position sensor triggered by the notched pulley. The old sensors on the flywheel are now redundant too.

Cheers, Eddie