Sure My Sad Isn't Working

[205*31* 0]

Ok i am sure my sad isn't functioning. On first start it fires quickly but is lumpy unless you blip throttle a couple of times engine will stall after about 2-3min it starts to idle ok then eventually it will sit around 1000-1100rpm very nice.

 

During the intial 10min drive revs will sometimes jump to about 1500rpm sometimes if i blip the throttle it will settle again to around 1100rpm but sometimes it won't after say 10min it will idle ok for pretty much all journey. I have also noted that if i squeeze the sad pipe that goes to tb while engine is running nothing happens at all thought the revs would drop really low and nearly cut out? does the sad sound fubar?

 

cheers.

[Simes 248 2 Cars]

From memory that sounds like my old 8v which was fine.

[205*31* 0]

From memory that sounds like my old 8v which was fine.

 

what you mean your old 8v did this and its classed as fine?

[pug_ham 245 3 Cars]

When your car is cold, pop the bonnet with it running & squeese the hose that goes to the front of the pipe between the AFM & throttle body.

 

If it dies or start to struggle to idle, the SAD is passing air through, try it again when ita warm & there should be no change iirc.

 

Having to give a few seconds on the pedal after start up is pretty normal but I never had to on mine.

 

Graham.

[205*31* 0]

When your car is cold, pop the bonnet with it running & squeese the hose that goes to the front of the pipe between the AFM & throttle body.

 

If it dies or start to struggle to idle, the SAD is passing air through, try it again when ita warm & there should be no change iirc.

 

Having to give a few seconds on the pedal after start up is pretty normal but I never had to on mine.

 

Graham.

 

ok graham thanks.

[205*31* 0]

When your car is cold, pop the bonnet with it running & squeese the hose that goes to the front of the pipe between the AFM & throttle body.

 

If it dies or start to struggle to idle, the SAD is passing air through, try it again when ita warm & there should be no change iirc.

 

Having to give a few seconds on the pedal after start up is pretty normal but I never had to on mine.

 

Graham.

 

Hi graham did your test and once i squeezed the pipe it started to go really low rpm almost stalling then eventually engine stalled so I guess it the sad is open but it can't be performing very well as I gather should idle around 1500rpm when sad is open? maybe it needs adjusting read on here you can adjust them.

 

What about the ignition timing also read abit more retarding can also improve the running of the gti?

 

cheers.

[Masekwm 2]

Search really is your friend.

[boldy205 75]

i took mine apart, cleaned it out and it back together with some very light oil (WD40 etc), and adjusted the gap where the air passes through, this can be adjusted with the 6mm(i think) nut. From memory there is a sprcified gap stated in the Haynes or Autodata book. There is also a set time the SAD needs to stay open when you passs a 12V current through it. If you get stuck, i can prob find you a picture of the gap/details. PM me if you need this.

Matt

[pug_ham 245 3 Cars]

Fast idle with the SAD shouldn't be as high as 1500rpm, more like 1200rpm imo.

 

Did it still idle fine when you squeezed the hose with the engine warmed through?

 

Graham.

[205*31* 0]

Fast idle with the SAD shouldn't be as high as 1500rpm, more like 1200rpm imo.

 

Did it still idle fine when you squeezed the hose with the engine warmed through?

 

Graham.

 

yes i already tested it when its warm and it idles fine so i guess the sad is shut then?

[205*31* 0]

Ok the sad definatily not opening on initial startup it appears to be opening about 3-4min after engine has been on? I thought all point of sad is to open to give it that extra air on cold start. It still appears to be open around 5min of its intial start how long should it take to close? does it look like sad is fubar or could it be a wiring issue?

[welshpug 1,666]

sounds like the disc in the SAD has been played with, it can be adjusted.

 

it should be open with a cold engine.

[205*31* 0]

sounds like the disc in the SAD has been played with, it can be adjusted.

 

it should be open with a cold engine.

 

hi welshpug well i got a spare sad and can see a nut on the sad I guess this is where you adjust them? what should i look for inside there is like a disc isn't there does this have to show or make it disappear?

 

cheers.

[welshpug 1,666]

that's it I believe yeah, you loosen the nut and you should be able to turn the disc till you can see the hole through it when its cold.

[205*31* 0]

wow! well i have cleaned it out with wd40 and took the nut of cleaned moved the thread around moving the disc inside and have adjusted it to max like a slice of pie but with alittle more of a hole big opening basically my old one was barely open!

 

I started it up and after about 3 sec shot up to like 2krpm then increased alittle more to around 2.5krpm, I may have over compensated on adjustment. I closed idle screw fully and was still idling around 1.5krpm after abit it started to settle to around 1krpm with a fully closed idle screw!, adjustments on idle screw now are very fine slightest movement can send rpm rocket have got it settle around 1.2krpm now on idle barely moved screw. How long should the sad stay open mine appears to be open still after 5min and engine bay pretty warm, is it cause the disc in sad will take longer to close now its at max?

[welshpug 1,666]

yeah it will take a while longer now.

 

it does sound like you need to start from scratch with the throttle stop and throttle switch settings as well as the Idle screw.

[205*31* 0]

Well i timed it and it appears its taking around 1min 30sec for sad to start opening it seems to idle better on cold start now around 1000rpm then when sad opens shoots to about 2000rpm but the sad is still open after like a 15min journey, shouldn't it have closed by this time?

 

The opening of sad uses more fuel am i right? so I don't like it constantly idling at like 2000rpm think I may readjust it.

 

Does the ecu tell the sad when to open and to close? could the ecu to failing? do the ecu's pack in after time?

 

cheers.

[pug_ham 245 3 Cars]

The normal position of an unpowered cold SAD is open with the pie slice visable as you look through the body.

 

IIRC the ecu has no connection to the SAD but like Meirion says, it should be open when cold normally & close as it gets warmed by the heating of the internal bi-metallic strip but it should be closed within around five minuutes at this time of year imo. The one I tested last week on my car had clsoed within five anyway.

 

The SAD doesn't cause the use of more fuel, thats part of the cold start cycle controlled by the CTS signal to the ecu that the engine is cold, the SAD just uses additional air to increase the idle speed to use the additional fuel.

 

Never heard of a dead ecu.

[205*31* 0]

The normal position of an unpowered cold SAD is open with the pie slice visable as you look through the body.

 

IIRC the ecu has no connection to the SAD but like Meirion says, it should be open when cold normally & close as it gets warmed by the heating of the internal bi-metallic strip but it should be closed within around five minuutes at this time of year imo. The one I tested last week on my car had clsoed within five anyway.

 

The SAD doesn't cause the use of more fuel, thats part of the cold start cycle controlled by the CTS signal to the ecu that the engine is cold, the SAD just uses additional air to increase the idle speed to use the additional fuel.

 

Never heard of a dead ecu.

 

thanks pugtorque. Well this one is defo better than the old sad unit, I guess some work great and some don't pot luck getting a good one

[welshpug 1,666]

its a simple device, all it gets is 12v with ignition, they either work or they don't in my experience of them, most idling issues I have found is more to do with worn Air flow meters, and very badly adjusted throttle bodies and throttle switches.