2004 XC90 2.5T rough idle and loss of power

RyanD727 · Post by **RyanD727** » 19 Oct 2012, 11:21

My 2004 XC90 2.5T recently began idling rough and losing power when accelerating quickly. I noticed an audible airflow noise that sounded different than the turbo spooling up as well. Today, the idle got worse and now the engine seems to stumble when driving. Also, the check engine light has started blinking intermittently. I am thinking this may be some sort of vacuum leak or PCV issue based on what I have read on other posts. Any input would be very heplful...Thanks!

Phantom73 · Post by **Phantom73** » 19 Jun 2013, 06:10

You may have to clean the throttle body, also known as the ETM in Volvo's. I had the same problem with my other Volvo (2004 S60) with the 2.5T engine.

sharpcar · Post by **sharpcar** » 19 Jun 2013, 14:30

hello out there in volvo land..i also have a 2004 xc90 i have the same issues and what i have been reading possible etm cleaning..i also have that air sound that icant pinpoint from where but i will find out the hard way...im takin apart the intake as we speak it looks like i could of done it from underneath but i decided to take it complety apart..i will keep u guys posted as i go...i also noticed that when i started having problems with her the hose that goes connected to etm poped off i think the back pressure got it..i put it back since then that pesky vaccum hose hissin sound so im figureing etm should be full of yucky gunk..at least thats what im thinkin...also noticed engine is super hot i dont think shes breathing properly so im gonna tackle this job a little at a time to get it done right and hopfully that cures my volvo xc90 blues...

Post by **precopster** » 19 Jun 2013, 15:46

Do you have check engine light as well? If you do cleaning the throttle won't help. The turbo hoses and clamps may have a leak.

Check them all but I guess they'll all come off and be retightened when you clean the throttle bore. Is air cleaner element clean?

sharpcar · Post by **sharpcar** » 22 Jun 2013, 15:49

hello out there in volvo land...intake manifold is completly out lots of work but it isnt that bad except for one screw that is in a real bad spot but i got her loose..sent out intake to get hot tanked..the etm i cleaned it up it really wasnt that bad new gaskets for intake and etm...im going to start putting her back together im checking all the turbo hoses too for leaks and using lots of new clamps old ones were really bad looking and some where original volvo factory clamps...the only thing that gots me stumped was the hose that goes to etm it doesnt fit snug like i would think it should i got a new clamp for that one tooo...but i think im gonna see if i can find i thin intake coupler=like a rubber band so that when i reinstall no air leaks...i will keep u guys posted hopefully i will have done the job completely by tomarrow...if this doesnt solve my issue one of my buddys told me to get the cat checked???

sharpcar · Post by **sharpcar** » 24 Jun 2013, 12:32

good morning to all in volvo land...job complete tedious but done....runs super but i still hear the a hissing sound on heavy accerlation..im thinkin its gonna be a semi clogged cat...but all other issues of hesitation and surgeing are gone drives nice if i dont gun it...good luck to all other xc90 owners and a special thanks to this forum it awesome...cheers everybody