Idle Control Valve S4 - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 40 (permalink) Old 11-09-2018, 02:08 PM
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this was a means of setting the throttle stop on a TS if you didn't have the factory gizmo.
I believe it would be the same on the S4, as they are not dissimilar and both are motronic.

the idea of blocking the ICV (not just disconecting the plug) sounds useful...
https://www.alfabb.com/bb/forums/1217184-post7.html

the guy also had a problem with the TPS.
they are not rocket science inside, a microswitch and some points:
https://www.alfabb.com/bb/forums/6401217-post21.html

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 #32 of 40 (permalink) Old 11-09-2018, 02:17 PM Thread Starter
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Was looking at: https://www.alfabb.com/bb/forums/eng...-position.html


This "If when you get it back together you find that the revs hang when you lift off the throttle, that's a likely sign that you need to open the butterfly a bit more."

That happens here so that might indeed be the issue.

The thread contains several procedures for adjusting the throttle stop - I'll go with Clayton105's.
Key part is blocking the ICV and then setting the throttle stop and TPS.
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post #33 of 40 (permalink) Old 11-09-2018, 02:22 PM Thread Starter
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Quote:
Originally Posted by spiderserie4 View Post
this was a means of setting the throttle stop on a TS if you didn't have the factory gizmo.
I believe it would be the same on the S4, as they are not dissimilar and both are motronic.

the idea of blocking the ICV (not just disconecting the plug) sounds useful...
https://www.alfabb.com/bb/forums/1217184-post7.html
Oops, faster than me. Hadn't seen your post.

Yeah, that's the thing I didn't realize - the ICV was affecting the idle disconnected,
and may actually let more air through than when connected.

That would explain the stalling. Fingers crossed.
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post #34 of 40 (permalink) Old 11-10-2018, 03:29 AM Thread Starter
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Yep, that was it. Thanks guys.


RPM"s dropping fast to about 1200 RPM and then very slowly to idle speed would be a vacuum leak?
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post #35 of 40 (permalink) Old 11-10-2018, 03:59 AM Thread Starter
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Quote:
Originally Posted by Gubi View Post
The door chime with the door open and the key in is triggered by one of the switches at the front of the driver's door, and it's not uncommon for that switch to need a bit of cleaning.
The switch casing on this one has a wire which apparently is supposed to touch the mounting screw - seems kinda iffy.

Pulled the switch out and there's one cable but it's not connected to anything - maybe it disconnected when I pulled it out but there was no resistance.

The only other loose cable I found in there is a different gauge.
Connecting the 2 does nothing.

Do you know if the chime sound comes out of the same thing as the lights buzzer?
The lights buzzer does work consistently, but the chime thing was intermittent.
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post #36 of 40 (permalink) Old 11-10-2018, 04:05 AM
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Quote:
Originally Posted by plasmid View Post
Yep, that was it. Thanks guys.


RPM"s dropping fast to about 1200 RPM and then very slowly to idle speed would be a vacuum leak?
what!
after all that it was really a vacuum leak? .....Gubi suggested that way back in post #2

where exactly was it and how did you find it?

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 #37 of 40 (permalink) Old 11-10-2018, 05:24 AM Thread Starter
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Quote:
Originally Posted by spiderserie4 View Post
what!
after all that it was really a vacuum leak? .....Gubi suggested that way back in post #2

where exactly was it and how did you find it?
Not even a leak - it was simpler than that. Had to raise the idle via the throttle stop
and adjust the TPS.

Basically, the throttle stop was set too low. As the ambient temps dropped there wasn't sufficient air to hold the idle with the ICV connected when the car was cold - ok when warm.

Looks like the ICV lets more air in when disconnected.

The key thing was understanding that the ICV affects the idle even if it's disconnected.


Re: leaks - might have some small ones - will have to check with the air pressure method,
but considering I can pull the OVS hose off and it doesn't stall, I'd say it was def. not a leak.
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post #38 of 40 (permalink) Old 11-10-2018, 06:04 AM
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Quote:
Originally Posted by plasmid View Post
Not even a leak - it was simpler than that. Had to raise the idle via the throttle stop
and adjust the TPS.
Basically, the throttle stop was set too low.
Ok, many thanks for the follow up and solution!

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 #39 of 40 (permalink) Old 11-10-2018, 07:03 AM Thread Starter
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Ok, many thanks for the follow up and solution!
Nope, I got to thank you guys.

Birra Moretti's on me.
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post #40 of 40 (permalink) Old 11-10-2018, 08:43 AM Thread Starter
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BTW - if someone needs the Idle Valve grommet, found some here:

https://www.italricambi.nl/index.php...ategory_id=349
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