Quote:
Originally posted by SVX10
I had some low RPM stalling when my Mass air flow sensor went bad. Don't know how to test it, but my subaru dealer diagnosed it for free. Maybe do a search on adjusting the TPS since that regulates idle RPM.
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No, the TPS doesn't regulate the idle.
No, you don't adjust any screw(s) to raise/lower the idle. The only screw available is the throttle stop and it's only to keep the throttle blades from digging into the throttle body. Messing with this screw is a Bozo no-no.
A vacuum leak will raise the rpm just as if the throttle were opened a bit. However there's usually a roughness added as a result.
The ignition timing is adjusted by the computer. As the SVX has no distributor there's nothing to adjust.
Nick's got the right idea. Do a search for cleaning the throttle body and idle air controller, that should be the cure. While you're in the vicinity replacing the PCV valve is a good idea.