Revs

adieu · Dec 20th, 2005, 17:22

Hi all, Hope one of you can help. Seems with the cold weather the car has developed a little fault. Before anyone asks no fault codes showing.

Seems that when I get to around 4000rpm in 4th the speed increases but the revs hold at about 4000, this happens till I hit about 90 (on my PRIVATE road) then the revs start to increase any idea's anyone?

Cheers all

Iain I

Dec 20th, 2005, 17:49

Quote:

Originally Posted by adieu

Hi all, Hope one of you can help. Seems with the cold weather the car has developed a little fault. Before anyone asks no fault codes showing.

Seems that when I get to around 4000rpm in 4th the speed increases but the revs hold at about 4000, this happens till I hit about 90 (on my PRIVATE road) then the revs start to increase any idea's anyone?

Cheers all

Iain I

guessing this is an auto.. sounds to me like perhaps the transmission fluid is low/expired?

sholtby · Dec 20th, 2005, 18:34

Got to be an autobox problem I'd have thought and there isnt much you can do other than change the fluid. Normally the problem is the other way round ie revs increase and speed doesnt which could be a worn torque converter.

Simon

adieu · Dec 20th, 2005, 20:10

Cheers for the quick response guys, will have a look at the weekend. Yes it is an Auto.

Is the trans fluid easy to change?

Iain I

sholtby · Dec 20th, 2005, 21:31

Have a look at www.volvospeed.com in the maintenance section. There maybe some info there that will help. You could also try posting your problem there as all the 850s are autos in the states. Or just search the forum.

Simon

warthog · Dec 20th, 2005, 21:39

Iain,

sounds like it could involve the torque converter lock-up. There have been cases reported on the US Volvo forums relating to auto gear change problems in cold weather due to solenoid failures in the 'box althought, from memory they mostly affect not changing out of first. These can be replaced without taking the box out of the car as they're situated at the bottom front of the box behind a removable plate.

I think there is also a system whereby the lock-up doesn't function until the gearbox oil has reached a certain temperature. Could this have any bearing on the problem?

bobcat · Dec 21st, 2005, 20:09

i also think maybe lock up, the engine will normally spin faster that the gearbox when not in lock up and slowly the gearbox will catch up and the lock up.

not sure about the temp issue, yes the tranny wont lock up at temps below 20-30c but even with my 3 13 row coolers my tranny still locks up on the motorway in cold condition.

and as you only have the std cooler setup theres no chance of your tranny running cold.

i suggest a few good atf changes to keep everything clean and fresh.

Dec 20th, 2005, 17:22	#1
adieu Master Member Last Online: Feb 5th, 2021 19:07 Join Date: Dec 2002 Location: swindon	Revs Hi all, Hope one of you can help. Seems with the cold weather the car has developed a little fault. Before anyone asks no fault codes showing. Seems that when I get to around 4000rpm in 4th the speed increases but the revs hold at about 4000, this happens till I hit about 90 (on my PRIVATE road) then the revs start to increase any idea's anyone? Cheers all Iain I

Dec 20th, 2005, 18:34	#3
sholtby Premier Member Last Online: May 26th, 2010 20:17 Join Date: Dec 2002 Location: north east	Got to be an autobox problem I'd have thought and there isnt much you can do other than change the fluid. Normally the problem is the other way round ie revs increase and speed doesnt which could be a worn torque converter. Simon __________________ '94 Celica GT4, HKS EVC 4 boost controller ~280 bhp ex. '95 850 T5 owner

Dec 20th, 2005, 20:10	#4
adieu Master Member Last Online: Feb 5th, 2021 19:07 Join Date: Dec 2002 Location: swindon	Thanks Guys Cheers for the quick response guys, will have a look at the weekend. Yes it is an Auto. Is the trans fluid easy to change? Iain I

Dec 20th, 2005, 21:31	#5
sholtby Premier Member Last Online: May 26th, 2010 20:17 Join Date: Dec 2002 Location: north east	Have a look at www.volvospeed.com in the maintenance section. There maybe some info there that will help. You could also try posting your problem there as all the 850s are autos in the states. Or just search the forum. Simon __________________ '94 Celica GT4, HKS EVC 4 boost controller ~280 bhp ex. '95 850 T5 owner

Dec 20th, 2005, 21:39	#6
warthog VOC Member Last Online: Oct 30th, 2021 14:51 Join Date: Dec 2001 Location: Bristol	Iain, sounds like it could involve the torque converter lock-up. There have been cases reported on the US Volvo forums relating to auto gear change problems in cold weather due to solenoid failures in the 'box althought, from memory they mostly affect not changing out of first. These can be replaced without taking the box out of the car as they're situated at the bottom front of the box behind a removable plate. I think there is also a system whereby the lock-up doesn't function until the gearbox oil has reached a certain temperature. Could this have any bearing on the problem? __________________ Brian '96 T5 Estate Auto

Dec 21st, 2005, 20:09	#7
bobcat Premier Member Last Online: Apr 18th, 2024 11:37 Join Date: Dec 2004 Location:	i also think maybe lock up, the engine will normally spin faster that the gearbox when not in lock up and slowly the gearbox will catch up and the lock up. not sure about the temp issue, yes the tranny wont lock up at temps below 20-30c but even with my 3 13 row coolers my tranny still locks up on the motorway in cold condition. and as you only have the std cooler setup theres no chance of your tranny running cold. i suggest a few good atf changes to keep everything clean and fresh.

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