Rough idle challenge - Page 2 - Alfa Romeo Forum
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(Post Link) post #26 of 28 Old 16-04-11 Thread Starter
Status: Project 33 16V
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33 16V 1.7

Hi George
Re the T2 connectors I copied the information from another web site a while ago. I am trusting the information to be accurate but I won't rest my reputation on it as I am no expert on Alfa Motronic systems. Here are the two pictures for it claims as being for LH & RHD vehicles.
As you say it seems odd for a manufacturer to put the T2 connector in to different places. Interestingly the other connector plugs as shown in this LHD vehicle photo are in the same place in my 33. The T2 connector in my 33 is in the same place as shown in the RHD vehicle photo. I wonder if it had something to do with something abscuer such as UK vehicle design specification requirements at the time? Any way it's probaby not all that relevant. In a RHD 33 the motronic unit is mounted under the glove compartment roughly where your steering column would be.

By the way, it has been suggested that I might be able to test the induction coil trigger by putting a metal 'T' piece in an electric drill and running it over the end of the magnet. Have you heard of this being done?

In terms of what to check next, I will do the ECU tests you suggested earlier and I will try to find the fuel evaporation solenoid valve as well. Can you tell me which wheel bay to start looking?

From there I'll swap test the AFM, additional air valve solenoid and induction coil trigger unit and then do the compressions. I'll keep you posted on the result.

Thanks again
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Hi Ron,

As i wrote earlier, i'm always happy to learn someting new.

About the inductive pickup testing: i haven't heard about this specific
method, but i belive it's working good. (I used to test the pickup
in it's place with an oscilloscope during cranking.)
As the "stalks" of "T" shaped magnetisable (this is important) metal
runs over the magnetic field of the pickup, it's generates voltage
in the pickup coil, which can be measured (either a digital multimeter
in AC mode or with an oscilloscope). The voltage and it's frequency
will be proportional to the drill RPM. Try to keep 5mm (0.2in) gap
between the pickup and the revolving metal piece.

The drill and the pickup has to be fixed correctly otherwise the pickup
pulls itself to the "T"-piece.

Check the resistance between the pickup's connector. Note the pins
where you can measure about 0.5-0.6 kOhms. Later when the test bed
is ready you can measure the pickup output voltage between these pins.

I hope this is anwsers your question.
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I forgot about the evaporator solenoid: i'm 80% sure it's in the left wheelbay (too) in the RHD vehicles.
If you see semi-rigid tubes (about 0.2in thick), and two wires (in a protective tube) penetrating the
wheelbay near the the ignition coil (between the coil and the intermediate bulkhead), then it's the
left side for sure.
The solenoid is bolted on the carbon canister. As i saw you have air conditioner installed, so the
solenoid accessible only after removing the plastic wheel housing from the wheel bay.
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