Join Date: Jun 2007
Location: Vancouver, British Columbia
Re: P0506 (Idle Control System RPM Lower Than Expected)
yep, first thing i heard to check for was the vacuum hoses.. and as we all know there are plenty of those, and it makes it difficult to pinpoint a leak unless you have a smoke machine. the least you can do is to check all the connections and visually inspect the hoses, worm clamps etc.
..i haven't had a chance to do anything yet, except reset the CEL... which has now came on again after a couple more warm up cycles.
I can notice the RMPs struggling a little bit now that i'm paying attention. never seems to dip under 500 though, but with my exhaust i can definitely notice a change of tone while idling
either way, when i have time.. i will clean the MAF sensor, throttle body, replace spark plugs, change fuel filter, and change my oil.
a combination of all these should eliminate the problem unless its a vacuum hose leaking... in which case it's most likely off to the mechanic.
also, i'm not sure if we have a IAC motor or not, but isn't the throttle plate in our throttle body controlled by some kind of motor?? possibly a malfunction with that... (shot in the dark)