The engine shakes at idle(~600rpms),also if you rev it will drop down in rpms below 500rpms almost stall.Also i'm getting some surging at lower rpms and slowers speeds. Are these things normal or is there a problem I sould be addressing? Thanks for your input.
Rough Idle & Surging?
1 - 13 of 13 Posts
IACV = idle air control valve. Affects the idle rpms. Sits atop the throttle body where the coolant lines go in and out.
Cleaning And Reattaching The IACV (Idle Air Control Valve) - NASIOC
MMm fuel pump could be too.. my boss' Chrysler had to have his pump changed twice to fix similar symptoms.
Cleaning And Reattaching The IACV (Idle Air Control Valve) - NASIOC
MMm fuel pump could be too.. my boss' Chrysler had to have his pump changed twice to fix similar symptoms.
Most (all?) Foresters don't have the IAC in the coolant system. The IAC is mounted in a similar place on the throttle body, but has a blue sticker. I think it is really the same for 98-04?
99 00-04 Impreza Legacy Forester Idle Air Control Valve : eBay Motors (item 160364684948 end time Feb-20-10 10:43:03 PST)
BTW I wouldn't pay that much for a used one.
yes mine is doin this too... i was hopin it would go away once i cleaned the throttle body..
but on the IACV.. we have this? i didnt think we did since there were a lot of posts sayin the newer DBW models dont have this..
n now readin Woodys post.. how would you clean the IAC? or do you just have to replace it?
but on the IACV.. we have this? i didnt think we did since there were a lot of posts sayin the newer DBW models dont have this..
n now readin Woodys post.. how would you clean the IAC? or do you just have to replace it?
ultimately for a long lasting repair i think you have to bite the bullet and spend the big bucks to replace, but periodic cleaning of throttle body is important regardless of any problems.
i used spray carburetor cleaner on mine with gentle wiping or brushing action on the part that is inside the throttle body with the brownish gunk on it. it seemed to help a lot but then i wasn't having severe symptoms to begin with.
i picked up a known good used one for about $40 to swap out and see if it makes much difference. i have a hard time paying more than 10-15% cost of a new one for a part like this.
edit
the newer ones are DBW, not sure exactly where they started. I have seen the IAC 98-04.
i used spray carburetor cleaner on mine with gentle wiping or brushing action on the part that is inside the throttle body with the brownish gunk on it. it seemed to help a lot but then i wasn't having severe symptoms to begin with.
i picked up a known good used one for about $40 to swap out and see if it makes much difference. i have a hard time paying more than 10-15% cost of a new one for a part like this.
edit
the newer ones are DBW, not sure exactly where they started. I have seen the IAC 98-04.
Ah ok. I have an 05 so I didn't know if 04 had something different like the older Imprezas.
No XT or dbw vehicle has an IACV. It's all computer controlled now.
ok.. so, what other than a dirty throttle body or vacuum leak can cause a minor rough idle n surging? could spark plugs do it? cause im due for a change in ~500 miles haha
ps.. sorry for jackin this thread
bump! for last question!
1 - 13 of 13 Posts
Join the discussion
Join now to ask and comment!