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Discussion Starter · #1 ·
Hi,

I bought a 2000 Aero 3 weeks ago (my first SAAB) and finally got it back from having the auto box reconditioned last week.....long story! Anyway, everything else seems fine and I'm loving the ventilated seats in this heat but its been idling quite roughly from day one.

I've kept an eye on the revs, which don't seem to move from 900 rpm and its really been annoying me as most of my driving in London is stationary. It was only today when I switched the ACC to ECON at the lights that the smoooth idle was restored. Switching again between ACC and ECON brought back the rough idle and vibration, which confirmed its related to the A/C.

Anyone have any ideas as to what it might be as in this heat, A/C is taking priority over a smooth idle?

Cheers

P.S. New to the forum and really enjoying it! :lol:
 

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The ACC compressor can put significantly extra load on the car, Trionic is supposed to raise the revs to cover this demand, but most seem to dip and idle more roughly, thats why you use about 10% more fuel with the ACC on too :confused:

PS Gald to have you here! ;)
 

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Discussion Starter · #3 ·
Chris - it's great to be hear at last, even with the detour to the gearbox specialist. Turns out it needed a new gear set and now its changing gear nice and smooth.

As for the ACC, how do I get the Trionic to do what its supposed to do?
 

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SAS32 said:
As for the ACC, how do I get the Trionic to do what its supposed to do?
Good question!

I recently cleaned my throttle body and the strain with the ACC on was less noticable, I am also having my ACC compressor swapped, it may have a lazy clutch causing problems you decribe but sometimes resulting in a stall :eek:
 

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It may be worth getting the software upgrade with the extra 50rpm on tickover, this may make all the difference. Is your ACC running nice and cool? If it's in need of some gas the system may be working overtime to keep up with the demand. :roll:
 

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Kermit said:
It may be worth getting the software upgrade with the extra 50rpm on tickover, this may make all the difference. Is your ACC running nice and cool? If it's in need of some gas the system may be working overtime to keep up with the demand. :roll:
What's the "tickover"?
 

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Kermit said:
Is your ACC running nice and cool? If it's in need of some gas the system may be working overtime to keep up with the demand. :roll:
So where is the port that we use to fill the acc system. I have the refrigerant ready, along with the gauge to put it into the system, but cant find the spot to hook it up to let the refrigerent run into the system. Any help on where the intake port for the acc would be appreciated.

Thanks,
Nick
 

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I believe the access to regass the system is from below the right hand headlight, or directly removing the headlight. :confused:
 

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Kermit said:
English term for idling. :cheesy:
Damn you English and your English, speak English damn it. :p

My car seems to struggle as well when the AC compressor kicks on at idle. This is exaggerated by the poly tranny mount I've got. I've just stopped worrying about it.
 
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Unless its different on some years the fill point for the a/c is really easy to find, Remove the front grille (Two plastic screws and grommits on the top lip) and the fill point is located up near the top right hand side of the rad.. ;) (No light removal is required.)
 

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i saw that one behind the grill and none of the fittings that came with my recharge kit fits that. maybe i missed one, so ill check it out tomorrow

Nick
 
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StX221 said:
i saw that one behind the grill and none of the fittings that came with my recharge kit fits that. maybe i missed one, so ill check it out tomorrow

Nick
Its a Saab you didnt expect it to be that straight forward did you :lol:
 

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Discussion Starter · #14 ·
Kermit said:
It may be worth getting the software upgrade with the extra 50rpm on tickover, this may make all the difference. Is your ACC running nice and cool? If it's in need of some gas the system may be working overtime to keep up with the demand. :roll:
Kermit,

The A/C seems cold but it doesn't freeze my face off and it spends a lot of time in recirc, which makes me suspect its struggling to maintain the temp (17c), so I'll get it regassed. Can you recommend someone in London for the regas and can I take the car to any SAAB dealer to add 50rpm to the idle?
 

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"Rough" idle

The "Rough" idle you describe sounds like the famous "Saab Shudder", which occurs any time the motor is at idle and is pulled down slightly by auto tranny + air cond., or in case of manual trans, throttling a little too late upon clutch engagement. It's basicly nothing to worry about. Forget it-- when you get used to your new car, you won't notice it. It's one of the Saab idiosyncracies.
 

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The recirc has 2 programmable modes. In one of the modes it will always kick into recirc when you're going under 10 MPH so in traffic you can breathe your own fumes instead of those of the cars around you. Hold down the recirc button for a few seconds to change modes.

It's bad to run in recirc excessively (I'd say over 50% of the time, but that's a guess at best) because it builds up moisture in the cabin air fan and so you get that "wet gym sock" smell before the filter is worn out.

I think you can have the dealer reprogram the idle speed with Tech II to help clear up the rough idle, or you can bump into neutral when stopped.
 

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Yeah, every time I come to a stop and have the AC on you feel a definite lurch when the compressor kicks in. Its getting cold aroudn here so i'm quite happy not to use AC anymore---every time its on you're superheating the air into your intercooler and reducing power to the wheels. And the cold weather really has amazing effect on the car, it feels as if my engine grew two cylinders!
 

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SAS32 said:
Hi,

I bought a 2000 Aero 3 weeks ago (my first SAAB) and finally got it back from having the auto box reconditioned last week.....long story! Anyway, everything else seems fine and I'm loving the ventilated seats in this heat but its been idling quite roughly from day one.

I've kept an eye on the revs, which don't seem to move from 900 rpm and its really been annoying me as most of my driving in London is stationary. It was only today when I switched the ACC to ECON at the lights that the smoooth idle was restored. Switching again between ACC and ECON brought back the rough idle and vibration, which confirmed its related to the A/C.

Anyone have any ideas as to what it might be as in this heat, A/C is taking priority over a smooth idle?

Cheers

P.S. New to the forum and really enjoying it! :lol:

Another thing to keep in mind is bearings, compressor and pulley. They can drastically slow the free running of ac system .
 

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pokerplayer said:
Remember gentlemen! Open windows and wind drag is worse than you AC on for your fuel aconomy.
Not strictly true....only if you are travelling over about 50 mph. Below that it's more efficient to leave your windows down. :cheesy:
 
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