Question about 2001 Volvo S40
I hope you can help me. My car doesnt seem to know what gear it should be in at slow acceleration and in town speeds. When you depress the gas pedal for smooth reasonable city driving from a stop, the car goes along shifts normally until about 2300 rpm then downshifts the rpm goes up to the 3000 range then shifts to next gear then rpm hits 23-2400 rpm then it continues this cycle of shift up and down although the speed of travel or the accellerator pedal position isnt changing. trying to hold 35-40 mph is dreadful as this surging or actual cycling of shifting continues until you either drive harder or reach 60 mph or faster. What do you think. Also the idle seems a little low in gear at 5 or 600 rpm and vibrates the steering wheel.
One unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well
Posted on Mar 23, 2017
SOURCE: Tire Vibration
I have the same issue - but notice its worse when you accelerate hard in 5th. I have changed all the ball joints, bearings and track rod ends but its still there. From trawling the various forums I'm starting to think I need to change the suspension arms and top strut bushes. 100K
Posted on Aug 18, 2008
The only fluid expansion tank I know of is for the cooling system,and if that is the case you my have a leak in the transmission cooler that is built into the radiator.
Posted on Jan 03, 2009
Several suggestions, some cheap, others not. The overdrive relay is the first suspect. It's located on the relay rack behind the fuse panel (usually). Cheap fix. About $10 on Ebay. Just be sure the part numbers match. I always carry a spare. The speed sensor might be another source of problems. It measures RPMs and feeds the info to the computer. Not an easy do-it-yourself fix. Also, the transmission control module. An easy swap with a spare from Ebay. It hides under the dashboard, passenger side. A solenoid on the transmission locks the OD in and out. Not an easy do-it-yourself fix. Volvos are notorious for flaky issues like this, so I would try all the simple fixes before bringing it to your mechanic.
Posted on Apr 23, 2010
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