i have a question about cvt's

spike4073 · Sep 9th, 2008, 14:32

i have recently experienced some problems with high revs....someone has reccomended i dissconnect the vacum hoses...or possibly just one of em...obviously i am dubious about doing this as i dont know how cvt's work and what efect this would have...so can anyone shed some light on what this will do ...if anything...and wether it is a good/bad or f***ing stupid idea?

Clan · Sep 9th, 2008, 18:18

Disconnecting a vacuum hose isnt going to make it work . You really need someone with experience of this system . The system is simple enough but the vacuum control needs understanding . Any one of 6 different things could cause it not to change up . but if you get to 50 mph the mechanical bob weights should change the ratio up ..

spike4073 · Sep 9th, 2008, 20:09

ok i will be sure to leave em where they are then...had it on motorway earlier today .had it at about 75mph...its the strangest thing it drives fine but sounds to me to be to loud....so i dunno wot to do one mechanic tells me it needs a new gear box another one tells me its a problem with the vacuum valves and the latest one says...well i cant find anything physicaly wrong with it but it does sound far too loud as tho stuck in low gear ....so i dont know who to listen to?

foggyjames · Sep 10th, 2008, 01:29

My suspicion is that the one who is telling you it's a problem with the vacuum valve(s) is closest to the truth. As Clan says, you need to find someone with experience of this system.

Whereabouts in the country are you? Perhaps someone here could take a look if they're local.

cheers

James

spike4073 · Sep 10th, 2008, 13:17

im in sheffield

foggyjames · Sep 11th, 2008, 00:52

Not so bad...I spend some time in Worksop (and Kiveton Park), so it's not much of a trek to come and take a peek there. My Mum hails from just north of the city, so I know it...a little!

Would you like a rev counter, by the way? I have one here, and it's a fairly quick/easy addition on a later car. What year is yours?

cheers

James

spike4073 · Sep 11th, 2008, 09:19

its a 1987 340 dl

foggyjames · Sep 12th, 2008, 01:32

87...that'll be the sort I have spare. In a week or two when I'm up that way, we'll have to see what we can do...

cheers

James

harpulina · Sep 12th, 2008, 15:02

Hallo Foggy
Can you post up your findings on spikes cvt as I have exactly the same trouble , and as I've just bought it, not sure what is normal.
look forward to your results.
Harpulina of Bradford

renaulthater · Sep 18th, 2008, 22:56

Hi all I had this fault a few years ago, although they do tend to rev high, anyway it turned out it was the unit on the inner wing (i think it was on the drivers side wing neer the expansion bottle) What a think had happened was i changed the drive belts and possibly blew a diaphram in the unit as i seperated the two cones, if i change them a again i will disconnect all the vac pipes. Not saying it will be the same on your car but the symptoms are the same.

Sep 9th, 2008, 14:32	#1
spike4073 Member Last Online: Nov 26th, 2011 11:12 Join Date: Aug 2008 Location: sheffield	i have a question about cvt's i have recently experienced some problems with high revs....someone has reccomended i dissconnect the vacum hoses...or possibly just one of em...obviously i am dubious about doing this as i dont know how cvt's work and what efect this would have...so can anyone shed some light on what this will do ...if anything...and wether it is a good/bad or f***ing stupid idea?

Sep 9th, 2008, 18:18	#2
Clan Experienced Member Last Online: Today 14:22 Join Date: Jun 2007 Location: L/H side	Disconnecting a vacuum hose isnt going to make it work . You really need someone with experience of this system . The system is simple enough but the vacuum control needs understanding . Any one of 6 different things could cause it not to change up . but if you get to 50 mph the mechanical bob weights should change the ratio up .. __________________ My comments are only based on my opinions and vast experience .

Sep 10th, 2008, 01:29	#4
foggyjames 300 Register Keeper Last Online: Today 01:27 Join Date: Dec 2001 Location: Nottingham	My suspicion is that the one who is telling you it's a problem with the vacuum valve(s) is closest to the truth. As Clan says, you need to find someone with experience of this system. Whereabouts in the country are you? Perhaps someone here could take a look if they're local. cheers James __________________ VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164

Sep 11th, 2008, 00:52	#6
foggyjames 300 Register Keeper Last Online: Today 01:27 Join Date: Dec 2001 Location: Nottingham	Not so bad...I spend some time in Worksop (and Kiveton Park), so it's not much of a trek to come and take a peek there. My Mum hails from just north of the city, so I know it...a little! Would you like a rev counter, by the way? I have one here, and it's a fairly quick/easy addition on a later car. What year is yours? cheers James __________________ VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164

Sep 12th, 2008, 01:32	#8
foggyjames 300 Register Keeper Last Online: Today 01:27 Join Date: Dec 2001 Location: Nottingham	87...that'll be the sort I have spare. In a week or two when I'm up that way, we'll have to see what we can do... cheers James __________________ VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164

Sep 9th, 2008, 20:09	#3
spike4073 Member Last Online: Nov 26th, 2011 11:12 Join Date: Aug 2008 Location: sheffield	ok i will be sure to leave em where they are then...had it on motorway earlier today .had it at about 75mph...its the strangest thing it drives fine but sounds to me to be to loud....so i dunno wot to do one mechanic tells me it needs a new gear box another one tells me its a problem with the vacuum valves and the latest one says...well i cant find anything physicaly wrong with it but it does sound far too loud as tho stuck in low gear ....so i dont know who to listen to?

Sep 10th, 2008, 13:17	#5
spike4073 Member Last Online: Nov 26th, 2011 11:12 Join Date: Aug 2008 Location: sheffield	im in sheffield

Sep 11th, 2008, 09:19	#7
spike4073 Member Last Online: Nov 26th, 2011 11:12 Join Date: Aug 2008 Location: sheffield	its a 1987 340 dl

Sep 12th, 2008, 15:02	#9
harpulina New Member Last Online: Oct 10th, 2011 14:44 Join Date: Sep 2008 Location: bradford	foggyjames and spikes 340 Hallo Foggy Can you post up your findings on spikes cvt as I have exactly the same trouble , and as I've just bought it, not sure what is normal. look forward to your results. Harpulina of Bradford

Sep 18th, 2008, 22:56	#10
renaulthater Member Last Online: Jul 1st, 2020 08:07 Join Date: Apr 2007 Location: wakefield	Hi all I had this fault a few years ago, although they do tend to rev high, anyway it turned out it was the unit on the inner wing (i think it was on the drivers side wing neer the expansion bottle) What a think had happened was i changed the drive belts and possibly blew a diaphram in the unit as i seperated the two cones, if i change them a again i will disconnect all the vac pipes. Not saying it will be the same on your car but the symptoms are the same.

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