Engine RPM

[hipbluescat]

Hello

I have a 900i SAAB 1990 model. I have noticed that when I do a lot of city driving that the RPM sometime stays at 1800 RPM even though I am stopped in the traffic.

Is this normal for the engine to do this ?

If it is normal then for what period of time should this do this for ?

If this is not normal then what is the problem with the engine ?

Regards

[Jezzadee]

Not normal.

A couple of seconds, if that.

Sticky AIC, probably. Try cleaning the AIC valve and throttle body with carb cleaner as described in the tech help section.

[jetman]

If not AIC valve, check also vacuum hoses for big holes or disconnect.

[hipbluescat]

I have also noted that if I rev the engine that the RPM also drop.

Does this confirm the AIC valve diagnoses ?

I thought that the SAAb has fuel injection and that there is no carbuator ?

Regards

[SteveTheFolkie]

sounds like your throttle linkage may be a bit dry and sticky - gradual release doesn't make it go to the stop but a sudden rev and dump does - a bit of lube on the pivot and even some wd40 down the cable might help -

There were Saabs with carbs - yours however would be injected - doesn't matter really - if the idle controller isn't working OR if the throttle is gummed up you're gonna idle high -

[jetman]

If you can blip it down there is a good chance its just the butterfly in the throttle body that's binding. Give it a good clean with some carb cleaner. Maybe even remove it and really go at it.

[Jaap_F]

Originally Posted by hipbluescat

I have also noted that if I rev the engine that the RPM also drop.

Does this confirm the AIC valve diagnoses ?

I thought that the SAAb has fuel injection and that there is no carbuator ?

Regards

I've had the same problem for about two years. Also bad at idling And my engine also dropped RPM a bit if I reved it a bit. Because of some problems, I checked the whole air intake system and I found a few minor vacuum leaks and a very dirty AIC. So I replaced some vacuum hoses and cleaned the AIC and since then it always idles perfectly.

And as said, carburator cleaner is the best stuff to clean the AIC with. This stuff is meant to clean parts of the air intake system with, so what better to use than this .