timing advance on an S3 spider - Alfa Romeo Bulletin Board & Forums
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post #1 of 8 (permalink) Old 03-25-2019, 12:30 PM Thread Starter
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timing advance on an S3 spider

What advances the timing on an S3 spider with Bosch injection?
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post #2 of 8 (permalink) Old 03-25-2019, 01:08 PM
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What advances the timing on an S3 spider with Bosch injection?
all done by the ECU based on signals from various sensors (AFM, TPS, CPS and CTS)
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #3 of 8 (permalink) Old 03-25-2019, 01:45 PM Thread Starter
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Dom
I figured that but I kept hearing about something vacuum operated back by the ECU from different ALFA sources. Some called it a "whirling willie".
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post #4 of 8 (permalink) Old 03-25-2019, 01:55 PM
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Yeah, the S3 has a manifold pressure sensor (behind and to the right of the passenger seat, I think.) It serves to increase the advance at cruise for better fuel economy.

Unfortunately the bellows in them tends to crack and leak, hence the whistling. It's an induction-based sensor so I don't know of any easy replacements. A lot of folks just cap off the line if it fails.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #5 of 8 (permalink) Old 03-25-2019, 02:07 PM Thread Starter
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Thats it Tom. A "whistling willie". I don't hear any whistling on my 1985 and it is not capped off so I guess all is good for now.
Do you know if the 1990 and later Motronic cars had that?
Thanks
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post #6 of 8 (permalink) Old 03-25-2019, 02:25 PM
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Dom
I figured that but I kept hearing about something vacuum operated back by the ECU from different ALFA sources. Some called it a "whirling willie".
no whistling willie!
Your 1990 engine management is pure Bosch Motronic ML4.1
iow. identical to the S4....there's nothing l-jetronic at all on your MY90 spider.

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.

Last edited by spiderserie4; 03-25-2019 at 02:29 PM.
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post #7 of 8 (permalink) Old 03-25-2019, 05:01 PM Thread Starter
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Dom
Thanks for that but i do have a 1985 also that has the old style whistling willie.

I need to sell one of them. I like the two pod set up for the 1985 but really like all the modern features on the 1990. Tough decision. Guess I could keep them both and sell my 928 Porsche....

Greg
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post #8 of 8 (permalink) Old 03-25-2019, 06:28 PM
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I’d keep the 1990. It’s a cool model year: you get the retro style with the better engine.
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Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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