2000 S80 idle fluttering

hu5ker555 · Post by **hu5ker555** » 27 Jul 2015, 06:30

2000 S80 2.9 non-turbo, 150k miles.

I was recently experiencing some fairly erratic idling. The tach would bounce around between 600 and 1000 rpm at idle. Sometime felt like it was about to stall. So I took apart the ETM and cleaned it up real well. Also sprayed clean the MAF. I tried to reset the ETM by disconnecting the negative battery wire while working. I also pulled the ETM fuse (#7), turned the ignition to position II, then turned it off, and re-inserted the fuse.

The erratic idling has been fixed. After warm-up, it now sits at a steady 650 rpm.

However, I can still hear the motor sputter a little bit every few seconds. The tach needle does not move, but the motor stumbles just a bit every few seconds. I've checked the vacuum lines and they all seem to be connected. Any suggestions?

Is it possible that the electronics just need some time to adjust to the clean ETM and MAF? I've driven it for about 5-10 minutes and have stopped/started the car several times now, but it's still happening.

jbkeene · Post by **jbkeene** » 27 Jul 2015, 10:02

could be the ETM

my symptoms were more severe than yours

I tried cleaning and PVC replacement, but it didn't help too much

ETM went bad and got a rebuilt unit from XeMODeX

smooth as butter now

hu5ker555 · Post by **hu5ker555** » 27 Jul 2015, 10:28

Thanks for your response.

I had some fairly severe symptoms, but now my ETM is clean as a whistle. No more RPM fluctuation. There is just a faint stutter every few seconds that I can hear, but no RPM movement.

Maybe I should check the PCV?

jbkeene · Post by **jbkeene** » 28 Jul 2015, 06:14

if you have never changed the PCV, surely it needs doing...gets wasted with oil
kits are available
syn oil helps keep it cleaner
would've been easy to inspect PCV when ETM was off...will need to remove ETM again to replace PCV

how about silly things...fuel filter, spark plugs, etc.?

hu5ker555 · Post by **hu5ker555** » 28 Jul 2015, 10:15

Thanks. Is there a way to easily check if my PCV is working properly?

hu5ker555 · Post by **hu5ker555** » 29 Jul 2015, 06:14

So I tested my PCV operation by giving it the rubber glove test. Seems to be working OK.

I do have a check engine light, so I pulled the code....P0302 cylinder 2 misfire.

I guess I need to check the spark plug and the coil to #2 next. The car runs great though (with the exception of a little stumble at idle). Hard to imagine that one of the cylinders isn't firing.

mumfy1973 · Post by **mumfy1973** » 31 Jul 2015, 04:11

Same as mine my Number 2 coil was playing up

jbkeene · Post by **jbkeene** » 31 Jul 2015, 06:16

yeah, look at the coils and wires...they can get crisp

tip: I remove the lower casing panel in summer...have actually had oil filter elements collapse due to heat

http://www.volvopartswebstore.com/showA ... 5.....part #8

hu5ker555 · Post by **hu5ker555** » 11 Aug 2015, 08:28

Got her fixed. I narrowed it down to coil #2 by pulling the code. This is the second coil I've replaced in two years. Also replaced all the spark plugs while in there.

Purrs like a kitten.