V70 XC AWD model 2000 -new shape- after 30 min runing, if stops on traffic light, when going again the gearbox starts jumping. Any idea of the problem and its solution, the approximate cost of the repair -labour and parts? Many Thanks, Alex.
Hello, I will try to help. Let me ask a couple questions first, Is the check engine light on by chance? and how many miles are on the vehicle? thanks.
Hi, Edward, there is not any light on the dashboard, all sensor lights were checked, and the mileage is 138,000 with all services done by a Volvo dealer. The vehicle is spotless in and out, like showroom one. The mechanic only said 'there is something wrong with the gearbox', nothing more was found, and further investigation was needed but the high cost of man-hour put me back on pursuing that. Regards, Alex.
OK, I understand, when you say "jumping" does the rpm gauge not correspond to vehicle speed? like it rev's too high before the vehicle begins to pull? or do you just feel a "fish bite" type scenario when taking off?
Hello, it's as you described like a "fish's bite" when taking off.
OK, That fish bite can sometimes be related to the engine misfiring, what is often perceived as a transmission issue, can sometimes be spark plugs, or bad coil tubes that lead to the plugs, so be sure and check those, and if you haven't had the plugs changed in a while, I would do so now just to be sure. Also, check the fluid level of your transmission. If the fluid isn't full, then top off with Volvo brand transmission fluid and check for any leaks. The angle gear in your AWD can give trouble too, it is what actually transfers the tourque from the transmission to the rear driveshaft, so if you were do remove that driveshaft and then take it for a drive, see if the problem still occurs. If the problem is gone, then I would suspect the angle gear to have an issue. If the problem is still there, then it's likely the transmission has some internal problems and will need to be rebuilt, or replaced. The transmission unit in the AWD for some reason doesn't seem to give as good of service as the units in the FWD version. I'm not sure exactly why, but I believe the added tourque of the AWD and added weight of the vehicle may have something to do with it. Here is something additional to try if none of my above suggestions help. Go to a ford dealer and ask for a bottle of friction modifier that is put in positive traction rear ends. Put about an ounce of friction modifier in your transmission. It can give worn clutch packs that extra grip and you may get some more life out of it. If the transmission is slipping some anyway, Then that may help get some more life out of the transmission.
Ok, your info sounds very fine, but I'm sorry l forgot to mention that the gearbox is auto, no manual, and you speak about 'clutch'. Obviously I'm not a technician as you are, but the auto gearboxes have some kind of clutch as well?
yes sir, the clutch packs in an automatic apply the various components of a planetary gear set. the planetary gear set has a sun gear, planet gears and a ring gear. Depending on which component you drive and hold, (via the clutch packs) you get your different forward speeds and reverse. So the friction modifier can help a worn clutch pack grip better.
I've had 10 years of experience on the car line at 2 Volvo dealerships, Quality level Volvo tech.
Many thanks, Edward all the info is very useful and practical. I don't want to abuse of your time, but do you have any rough idea about the cost of a replacement gearbox in the case there is a need to do that? Alex.
Thank you Alex. To replace will most likely be more than to rebuild. It would be wise to walk into an Aamco transmission center one day. Perhaps get a technician or service manager to test drive with you. Dealership will be expensive (3000 at least). Aamco specializes in transmission overhauls, where the dealership doesn't, they will just replace the entire unit. So Aamco will be less, and also Aamco can provide you with a lifetime warranty for a little more money. Which, if you were planning on keeping that car for a long time, might be something to consider.