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Discussion Starter #1
Hello people ! :)

Come on guys, I'm sure someone will know the answer to this :

16v non catalytic throttle bodies, with throttle switch rather than sensor ( as if it makes any difference on the adjusters )

Apart from aligning the adjusters to be sure that both throttle bodies open up at the same time , on each throttle body there are :

2 bolts covered in silicone - air mixture - one for each cylinder
2 vacuum slots under them - which have nothing connected to them as they are fully tight and no air goes in and out - I believe they are there only for tuning purposes.

Then you've got 1 vertical bolt on throttle arm and one side one.

I wont tell you how I'm tuning them, I just want to know what the right proceedure is and what the values of suction should be at idle !

I really hope I can get a reply on this one :)
 

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Discussion Starter #3
No mate, I havent got any hesitations with the balance.

Tha balance isnt my problem.
The air mixture screws are ! The ones that are stuffed with silicone on the top.
Are those supposed to be fully bolted in like I've been told ?
When I put the vacuum dials on, if they are fully bolted, the revs drop a lot, but unbolting them give you a value that is impossible to get the same value on the other 3 cylinders.

Should I just bolt them fully and just play with the trottle bolt on the side ?
 

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Discussion Starter #6
Thanks Al,

problem is that I cant remove my intake plenum, as this engine is different than yours.
Catalytic versions with the throttle position sensor, will still start and keep running without the intake plenum.
The non catalytic version with the throttle position switch, will stall and kill the engine as soon as you remove the intake plenum.

The gauges I borrowed and used, have readings from 0 to -3.
My readings were -2 on one side and -1.2 on the other side.
As much as I tried getting them to have the same values, I couldnt adjust one side past -1.5 or the other side lower than -2 !
Its like an on or off thing !!!

In any case, the adjusters I played with, were the ones over the vacuum slots and they were stuffed with silicone over the bolts/adjusters.
Are those the ones you played with ?
 

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Discussion Starter #8
dont think so mate, I might but I really need to look to find it.

In any case, I got some answers from an ex alfa mechanic today ;)
He told me to use a 2mm filler in the throttle bodies to adjust the accelerator adjusters, make sure that they both open at exactly the same time, and vacuum suction should be about -2 give or take according to what the engine works better and adjust all air mixture valves to the same figure.

I'll give it a go and see how it works out.
 

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Discussion Starter #10
Thanks mate :) and thanks Face !

it says in the manual that its recommended a 1mm to adjust the stops.
You are saying 2mm is better ?
 

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I was told to use a 2 thou feeler gauges down the inside and adjust the stops until it just bites when the stops are closed.
I think the 1mm you are refering to is the gap between the linkages.
 

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Discussion Starter #14
I was told to use a 2 thou feeler gauges down the inside and adjust the stops until it just bites when the stops are closed.
I think the 1mm you are refering to is the gap between the linkages.
Just got the fillers from Paul, along with the 4 gauges.

His filler kit goes from from 0.2 to 0.7mm
to do the 2mm gap, I need to put 3 of the fillers together, and it looks like A LOT of gap !!!

Starting to think that 2mm gap just isnt right !!!
Could it be 0.2mm gap ? Makes a lot more sense if its 0.2 !

Can anyone confirm ?
 

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Discussion Starter #16
thats what I think as well !
only problem is that the manual mentions measuring it in the "K" scale !
WTF is the K scale ? I'm not that good in geography ! :tut:

What about mm's and psi or bar for the suction ?
 
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