99 S79 Electronic Throttle Module cleaning/poor idle

Hello,

Just thought I would post this to help others. Our 99 S70 (with 110K
miles on the clock) had exhibited random, intermittent surging, along
with a low idle of about 600 RPM. At this low idle, it was running
rough.

Dealer suggested cleaning the ETM. I have a copy of Vadis, it doesn't
mentioning any cleaning procedure, just R&R. Actually, it describes a
super long R&R procedure that would take a couple hours & a special
tool to do. I looked at it, thought they were a bunch of Swedish
fools, and had it off in about 10 minutes. Didn't follow their
procedure at all. Didn't need to.

Anyway, carefully removed the years of carbon accumulation around the
butterfly with carb & choke cleaner. Put it all back together.

Started up, ran for few miles and couldn't believe the difference.
Idles smoothly at the 850 RPM spec.

Anyway, if your car is randomly surging and idling below 850 rpm,
clean the ETM.

Did I say that Vadis sucked? Oh yeah, I did. Oh well, I'll say it
again; Vadis sucks.

Jeff

 

Vadis will not have the information about cleaning the ETM this will be
found in a service bulletin which is the dealer has access to on the
intranet or you could check out Volvos web site to purchase the bulletin

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as long
as I live,
nor should any American.
"Mow Green"

 

I wish I knew this 3 weeks ago.
I have a 2001 S60 2.4T with 106k miles. I too had the same situation. Mine
got worse and finally the car would lose power. I would get an error code
on the dash that said "Power Reduced". No shit, right?

Anyway, took it to the dealer and it ran $800 to replace the ETM.
Luckily I purchased an extended warranty that covers electronics.

Charlie