2006 xc90 v8 - Rough idle in drive while on brake..

humberto103 · Post by **humberto103** » 24 Aug 2016, 15:12

Video coming to a stop in drive verse neutral

https://goo.gl/photos/FRrhaBVihAqRYnnX8

Post by **Roger_850T** » 26 Aug 2016, 10:52

I have one more data point for you - today I had VIDA/DiCE hooked up to my 2005 V8, so I tracked the throttle position and engine speed while I started it. The throttle position was at ~11% for the first minute while it warmed up, then dropped to ~5.5% to ~6.0% and stayed there while it idled at ~710 rpm.

This was in Park. I didn't think to put it in drive and see what that changes.

Comparing this to what you captured, it looks like your ECU is at least commanding the throttle to a higher position in response to a lower rpm. (Yours was ~7%.)

What we don't know - is your car running low because the throttle is not responding properly, or is the throttle ok but it's running slow because of some outside influence.

humberto103 · Post by **humberto103** » 28 Aug 2016, 00:47

Looks like I'm going to have to pull the booster and investigate. I do have a vacuum line that I haven't been able to verify that runs under the fuse box.

I won't be able to get to it for about a week. Thanks again for the feed back R.

humberto103 · Post by **humberto103** » 22 Oct 2016, 22:25

Still having this low idle issue. Ive change out the throttle body and the brake boster with some used junkyard parts, didnt change anthing. Its a shame, 99thousand on the clock and i might just have to through in the towel.

Took some video that shows the transmission shift IND mode - lock up function
https://goo.gl/photos/MLaduiebp7CJMidF9

I did capture some video of this sound that cant wrap my head around
https://goo.gl/photos/xrfLyUE3SSnrJK2GA

Watchen the first vid you can almost here that same wining noise in the cabin at stop while on the brake.

Masscomguru · Post by **Masscomguru** » 23 Oct 2016, 18:08

That sounds like your torque converter is failing... Maybe the rough idle is being caused by it not releasing fully? or clutches are grabbing?

humberto103 · Post by **humberto103** » 24 Oct 2016, 17:32

Aside from the above she drives and shifts good.

ctarc · Post by **ctarc** » 06 Apr 2024, 07:06

Just saw these old posts and figured I take a shot since I have the same problem on my 07 xc90 4.4l. Did you ever find a solution?

2006 xc90 v8 - Rough idle in drive while on brake..

Re: 2006 XC90 v8 - Rough idle in drive while on brake..