33 brake warning light - Page 2 - Alfa Romeo Forum
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Status: 33 shaped fire imminent
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Thanks very much for the information, hopefully my part will arrive soon but still no sign of it and I can't pass the MOT without it

My car has a cat, would the 155/164 AFM still work ok if I needed to use one?
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..for cat engine the bosch 0280202208
(model without CO trimmer) from 155 /164
(the previous one we talked about)
should it works..at least two users here
are using it on a 33 16v with satisfaction
(one also without cat, he says he had to
adjust the VAF inner coil one steep to get
correct CO ad idle)

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Does anyone know is a 145 (boxer) MAF the same as a 33 one?
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alfa 33 1.7 16v uses a VolumeAF sensor,
alfa 145 1.7 16V uses a MassAF sensor.
alfa 145 1.3 I.E. uses a simple air pressure sensor (same as alfa 33 1.3 I.E)

Theorically MAF or the simple air pressure sensor
are better than VAF, because of a bit less air resistance,
but for elaborations also a bigger VAF
could be a possibility (from alfa 155/164 bigger engines as v6).

If you are planning to use MAF from 145 1.7 16v
I think that to get advantage over the original VAF of alfa 33 16V
you have to use it with aftermarket ECU / or 145 remapped ECU.
Because if you use the complete electronic system from 145 it was
a bit low performance/low emissions respect the ML4.1 of alfa 33 16v ??
(and you should also swap the flywheel as it have a different
tag sensor angular position).

May be if you can use an aftermarket ECU,
a good way could be use a simple air pressure sensor?
There are also some types of these sensors with both negative
and positive pressure reading for use on over-charged engines;
I read maybe on this forum that using air pressure sensor on
boxer 16v you have the problem of stabilize the pressure fluctuations
at the sensor at low revs but it can be done with some tricks.

I had founded this:

- 145 1.3 I.E. boxer : IAW-Marelli system with a simply air pressure sensor

- 145 1.6 I.E. boxer : Motronic MP3.1 system with air pressure sensor

- 145 1.6 I.E. boxer : GM system (don't know if MAF or air pressure sensor?)

- 145 1.7 16v I.E boxer: Motronic M2.10.3 system with MAF sensor,
see image at page 18 of this:


Last edited by bobkelso; 03-04-15 at 15:53.
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Ok at last I have had a look at the control unit on mys sons 33. It is not the control unit that is faulty but it was wiring to it from the sensors. By carefully using a multimeter I checked continuity and wire colours going from things like the brake fluid sensor and found wire circuits were not being made. Took me about 1.5 hours but now all works fine. If you can not find the break in the circuit you can bridge behind the control unit so it feeds the main dash correctly. My sons is a series 2 but huge difference in series 3 I think. I think I may have wiring diagrams I can send. but following colours should work.
Good luck. John
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brake , light , warning

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