Motronic version questions

[hella 325]

What cars had the different motronics (i.e 1.0, 1.1, 1.2, 1.3) and what are the diffeences in them, and what ecu numbers were associated with teh versions? Thanks.

[AdamF 88iS]

Early 318s are L-jetronice.

Early Eta cars and M3s are motronic 1.0. This is a full motronic style AFM fuel control and single coil ingnition control system with O2 sensor, but no check engine light or diagnostics yet.

1988 Super Etas are 1.1 as described below.

325i cars started with Mot 1.1 in '87 and were upgraded to 1.3 in late '88. This is similar to 1.0 but it adds check engine light abilities and some slight adaptations for the idle control. 1.1 has 4 fault codes it can store, 1.3 has about a dozen.

Late 318 cars with M42 engine are 1.7. This adds multi coil ignition system to the abilites of 1.3.

[cthulu703]

Word.

[hella 325]

so the only diff in 1.1 and 1.3 are the fault codes?


btw. thanks. that was a VERY good post.

[AdamF 88iS]

The 1.1 and 1.3 computers are physically put together differently too, word on the street is that the 1.3s are more reliable. Some say that the 1.3s idle better too, but there's no real evidence to support this.

[e304lyfe]

Some say that the 1.3s idle better too

i have heard this as well.. and also found it to be true when swapping a newer ecu into my beater.

[Borat]

323i and pre FL 320i were also L-jet.

[hella 325]

ok i have a 1990 engine with a 87 wiring harness, and a 87 ecu. Wgat would it take to convert from the 1.1 i have to 1.3?

[AdamF 88iS]

ok i have a 1990 engine with a 87 wiring harness, and a 87 ecu. Wgat would it take to convert from the 1.1 i have to 1.3?

Plug in a 1.3 computer. Everything else is the same.