Bosch Motronic problem

[Don Irwin]

Can I call on the massed wisdom of digesters for help with a problem I have on
an Alfa Romeo 90 (Alfetta with different body). The engine is a 4-cyl 2 ltr
with Bosch Motronic engine managment.

Car had low compression and was difficult to start and not v. performant.

Changing  piston rings without any difficulty but since then it will not
run for more than a couple of seconds.  Starts well but quickly dies - as it does
so I hear the Air Flow Meter (AFM) flap dropping back and the fuel pump cutting
out. 

The AFM has been checked by a Bosch agent - he says its ok .

The ECU can only be tested on the car and Bosch say it rarely fails. As its
not running cannot get it to a garage !

The temp sensor (adjacent to the injectors) is ok (say Bosch ) altho if
I disconnect this the car will run (unevenly) for ~ 30 secs before cutting out .

When cranking the engine all injectors deliver fuel .

All the Bosch manuals describe a cold-start injector - there is none on this
model - simply 1 injector per cyl.   They also describe an O2 sensor (on the
exhaust) - again none on this model - I assume the feedback from this is 
statically emulated from the ECU.

The other sensors(2) I find on the engine were also on a carb-equipped Alfa
GTV I once had so I don't think these are realetd to the problem I am experiencing.

Any help is appreciated.

Don Irwin    


  __________________________________________________________________________
 |                                                                          |
 |  Don Irwin               E-Mail: Don_Irwin at grenoble.hp.com               |
 |  TNO B1 N2 C1 - box 13                                                   |
 |  Hewlett-Packard France                                                  |
 |  5 av R. Chanas - Eybens  Telephone: +33 (0)476 14 1774 (Telnet 779-1774)|
 |  38053 Grenoble Cedex 09  Fax:       +33 (0)476 14 1686                  |
 |__________________________________________________________________________|