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Re: help interpreting AIC valve/O2 readings ... Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 9 May 2006 05:26:38
In Reply to: help interpreting AIC valve/O2 readings ..., Brian, Tue, 9 May 2006 04:11:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The Saab LH manual calls out 20 +/- 5 ohms for 1-2 and 2-3. Pins 1-3 is just the sum of 1-3. So according to the Saab LH manual, the COILS in the AIC are OK.
The AIC is an electromechanical valve. Current flows through the coils, and that current moves an actuator. All measuring the resistance does is check to see if the coils aren't blown open or have shorted windings. It's still a good test to run because it's easy and catches some failures.
However, if the mechanical portion AIC valve itself is dirty or sticking, you can get weird idle activity. And moving parts, especially ones exposed to air, moisture, fuel, and oil, sitting on top of a hot vibrating mass (that doesn't sound so good, does it?) can get gummed up and stick.
The AIC does make a whoosing noise as air moves through. As to the O2 sensor, those readings sound just fine. The system is designed to swing slightly lean to slightly rich (the 0 to 1 volt swing); staying at 0 volts for a bit probably just means that the system was running a little lean at that point.
Under acceleration, the AIC is out of the picture, and pretty much the same can be said of the O2 sensor. The engine control enriches the mixture during acceleration, and doesn't take the O2 sensor reading as much into account.
I'd look at other places, starting with ignition. Make sure your plugs are good, the right ones, and properly gapped. If your ignition wires are over 3 years old, replace them. Same for the cap and rotor. Of course ,make sure the timing is spot on.
Is this behavior in any way associated with how warmed up the car is? Namely only when cold, only when fully warm, or only in those 10 minutes as the car warms up? I have seen ignition coils fail such that they only screw up as the car is warming up, and are just fine cold or warm. Everybody ignores the ignition coil, but I've had a couple/three fail over the years.
The other issue may be the ignition amplifier is on the way out. That's a tough one to diagnose until it quits.
posted by 192.249....
, Tue, 9 May 2006 05:58:03, Tue, 9 May 2006 05:26:38 <-- Viewing This Message
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