'Hanging' Revs

[MattB]

I have experienced this problem since owning the car - approx 6 months, but appears to be gradually getting worse.

When 'dipping' the clutch to change gear, the revs tend to 'hang' before dropping to idle. It happens at both high and low revs - but I think the problem is more apparent at high revs.

Has anyone else experienced this at circa 96k - could this be a sign that the clutch (or parts of) is on its way out??

I read that a Stage 0 Tune-up can often remedy 'hanging revs'. Tune-up is just around the corner, but feel its something a little more than this?

Any ideas guys??

[lance]

Leakey vac hose or ,idle control valve , I think air con issues can cause it too, a fairly common fault on 850s as far as I know

[MattB]

No Aircon on the car, but Idle Control Valve could be a suspect, I guess.
When starting the car (without pressing accelerator), the revs are quite high (poss 1300/1400) then settle to 900 or so after a few seconds. How much would a control valve set me back - is it best to have a volvo dealer carry out the work?

[lance]

A visit to volvo main can get costly, worth checking if there are any independent specialists round your way?

Could be worth checking your vacume pipes for splits etc?
Im sure there are some good illustrations on here that show you how to!

Just as an indication does your boost gauge go 2/3-3/4 in the white when you nail it in the higher gears?

[mulletboy2]

Hrmm.. this has been getting worse on Nookie recently.

Paging Mr Wobbly (just joking... I think I can sort this one myself) :D

[pzorb]

Err now you got me worried! When i start my car up it revs upto about 1500 then after a few secs sits at it's idle of around 800. And hanging revs, well push the clutch and they fall but not instantly... what's the problem with this anyway? Hmmn my clutch is totally knackered so much that i've booked it in, this the cause? What? Eh? I'm lost!
And when it was stock, it would only just ever creep over half in the white at the best of times - before the clutch died and after the remap i'm boosting off white but only for a little while before settling just before the end of the white. Thought this was normal?!!

Martin

[pault5]

hi,
when i start my 850 t5 it revs to about 2000 rpm then falls to about 1000 rpm, 900 rpm when warmed up. now i'm afraid very afraid!!
cleaned idle valve at the weekend no significant difference.
i thought this was normal.
paul.

[craig]

my t5 does exactly the same and it seems from me asking this question before that its very common , ive driven 4 t5s and they all did it .my dads a mechanic and said that cars with a big fly wheel tend to run on a bit anyway and he also said that the pressurised system will carry on the revs a bit anyway, but any way mines allways done it and its never changed a bit and still goes like stink so let it rev if it wants to.

[TangoDeltaSierra3]

Mines another one too, if i wait that xtra second between gear changes it;s fine, but my tickovers fairly even at around 850 - 900 rpm.

[Redbrick]

Mine fine on start up, doesn't over rev, but the revs do hang when changing gear.

[Wobbly Dave]

Sticky throttle? Idle valve or air leak. Usual suspects

[enrm6]

Not sure, but there is a line between this being normal and a problem. I'm sure I read somewhere that a small amount of this is to do with controlling emissions. I noticed similar behaviour when I hired a Mondeo for work a few months back. However, if it is doing it for what seems like a longer period than necessary then start looking for problems.

[Mrsmopp]

I have the same rather infuriating problem intermittently. My revs hang between 2 - 3k, if I change gear between those rev's then it shoots up to 3k and holds for a couple of seconds before dropping back. It tends to do it when its running low on fuel, if its really warm out or I have had the air con on. I still have no idea what the problem is buts its highly frustrating! :sick:

x

[lance]

My Mrs 850 occasssionally hangs on to the revs between gear changes a little and sometimes wants to tick over at 1100 rpm but a quick blip on the throtle cures it!
I know I have a small vac leak which is hardly suprizzing as I have had to replace almost every rubber part ( the cars 10 years old but only done 78k)
I suppose the vac leak would be more of a problem if the car was modded but even with a slight leak she really flies!

[siamblue]

Mine used to do it coming to a standstill revs would hang to 1200 then slowly down to 900, Replaced the plugs rotor arm and dizzy cap, Now the revs come back straight away now.

[pzorb]

Hmmn well this is just a guess, but if the aircon's on, wouldn't there be more inertia on the flywheel and so the engine would tend to hang for just that little bit more before overcoming it and slowing? Isn't that why using a lighter flywheel gives you better throttle response?

Martin

[MattB]

A visit to volvo main can get costly, worth checking if there are any independent specialists round your way?

Could be worth checking your vacume pipes for splits etc?
Im sure there are some good illustrations on here that show you how to!

Just as an indication does your boost gauge go 2/3-3/4 in the white when you nail it in the higher gears?

Probably closer to 2/3's.
TBH at this point, I'm usually watching the t***** that' s been sat on my boot lid for the last mile or so, disappear as I hand them their arse!

:firedevil

[MattB]

I have the same rather infuriating problem intermittently. My revs hang between 2 - 3k, if I change gear between those rev's then it shoots up to 3k and holds for a couple of seconds before dropping back. It tends to do it when its running low on fuel, if its really warm out or I have had the air con on. I still have no idea what the problem is buts its highly frustrating! :sick:

x

That's exactly what happens to mine....

:cry:

[lance]

To be honest if you have no fault codes ie lights on dash and it regularly serviced there cant be much wrong! ( If you can live with it!)
Might be worth greasing the throtle cable wheel near the vac tree, its worth looking at the condition of your vac hoses!
A point 0 service with new parts if required is never going to do any harm, Fuel Filters often get missed by Volvo main too, mine just had its first one at 140k and you would be supprised the difference it makes!

[Mrsmopp]

That's exactly what happens to mine....

:cry:

Well thus far we have tried greasing the cable - to no avail, changing the bcs - to no avail and various other options but nothing seems to cure. I haven't replace the throttle body as its completely intermitent and difficult to diagnose as you can guarantee that when I take it to a mechanic it doesn't blooming do it!! :slap:

The car runs perfectly in every other way and can find nothing to indicate the cause - Its not something I can live with tho so the search for the fault continues!!

x

[lance]

On a positive note the revs hanging high up could help slightly for spirited slightly quicker acceleration!

[MattB]

Could be worth checking your vacume pipes for splits etc?
Im sure there are some good illustrations on here that show you how to!



Any ideas where I can find this guys???

[craig]

i aggree with you lance .
i actually like the hanging revs it also forces you to change gear smoother if your not gunnin it which preserves your box and makes you a smoother driver, i sugest you leave it alone and adapt.

[lighterfuel]

Mine just revs high when my foot is sooooo far down! From starting in the morning to returning from work, Arn't T5's suppose to rev high?...lol...ALL THE TIME!!!! (well mine does)

im an Ex traffic cop in Sussex and i can tell you i have never really seen any T5 rev low, Not in my old line of work anyhow...lol

good site boys and girls (i presume there are girls here?) (and i bet someone replys about a bloke here being a girl...lol cos they Always do on any forum on any subject)