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PostPosted: Thu Dec 06, 2018 8:43 pm 
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Joined: Thu Dec 22, 2016 11:29 pm
Posts: 17
Car Model: C900 1990 vert turbo
Ok guys I have changed a lot in the car and it’s in th USA.
New idle control valve all vacuum hoses had throttle body off, reset the throttle sensor on the throttle body.
After this the car idled fine but after I restarted the next day it idled at like 2 to 3 k rpm. This was what happens before I reset the throttle body switch and fitted the new idle control valve. I still suspect that the icv or one of the hoses to it is allowing to much air into the throttle body . Any idea how I can fix it.
I am in the UK at the moment so can’t work in the car. I redid the interior as well it was tan now it is black and red leather, door cards black and Ali dash.


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PostPosted: Sat Dec 08, 2018 7:35 pm 
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Saab Nut
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Joined: Fri Aug 05, 2005 7:42 pm
Posts: 1951
Location: PRESTON. LANCASHIRE
Car Model: 9000 Aero, 900 Ruby, + others
How did you reset the throttle sensor?

Steve.


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PostPosted: Thu Dec 27, 2018 6:47 pm 
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Joined: Thu Dec 22, 2016 11:29 pm
Posts: 17
Car Model: C900 1990 vert turbo
Throttle body taken off and adjusted so it clicks as soon as throttle opens , once car is warm it is idling at 1500 rpm if I put a heavy load on electric like rear window defrost it will dip slightly then climb again. If a squeeze the larger bore hose from the aic valve when car is warm rpm goes back to 850 rpm. It’s a brand new Bosch AIC that I tried to fix the problem but it’s still here. I was told the car should stall out if I closed off the aic hose, but revs just drop to normal. I am now wondering if the turbo bypass valve is gone and letting air though


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PostPosted: Sun Dec 30, 2018 7:08 pm 
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Joined: Thu Dec 22, 2016 11:29 pm
Posts: 17
Car Model: C900 1990 vert turbo
Small update, I pinched off the aic hose to the throttle body and car stalled out. But it is running at 1500 rpm all the time. It’s a new aic valve Bosch l2.2 system. It’s like the aic is staying fully open all the time?. I also fitted the red Ecu upgrade before this problem started. Could the Ecu be faulty?


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PostPosted: Sun Dec 30, 2018 9:28 pm 
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Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 518
I don't know about USA spec cars but UK 900's with Bosch LH 2.2 did not have idle control. The air valve was just to compensate for cold engine.
Idle speed was set manually by correctly setting the throttle stop screw and then adjusting the idle speed with the air bypass screw.
Leaking bypass valve will increase idle speed, clamp off the vacuum hose to check.
Has the car got A/C?
APC will have no effect on engine idle speed - Assume you mean APC ECU when you refer to red box?


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PostPosted: Sun Dec 30, 2018 10:15 pm 
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Joined: Thu Dec 22, 2016 11:29 pm
Posts: 17
Car Model: C900 1990 vert turbo
Car has air con, and yes red apc, the car def has an aic it only has throttle stop adjustment.


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