hard acceleration at 40 downshifts, but no upshift until throttle eased off Topic is solved

[Rattnalle]

There is an option in VIDA to show the actual gear in the DIM instead of just the D, if that's any help to narrow it down. Apart from error codes of course. Would be interesting to know for example if it does the same if you're in a slightly higher speed so that flooring it only makes it downshift to 3rd.

In general, keeping an older but well known car going is almost always cheaper than either buying a newer car and paying for depreciation or another old car with new faults that need fixing. I'm guessing it's even more true over there where you're paying about a third of our petrol prices so a newer, more economical, car won't make as much of a difference.

[mp5802]

After reading a lot of posts on shifting problems regarding upshifts and downshifts from 3rd gear, I'm now thinking I may simply have the classic defective B4 Cover Servo issue with my trans. The IPD comment thread on the replacement kit is full of posts that sound very close to what I'm experiencing. I see the B4 kit is pretty cheap, around $30. However, it looks like a bit of a PITA to do the job, and my landlord won't let me jack up the car or drain fluids. So, has anyone had this done that can give me a ballpark estimate to just have it done? I'll likely avoid the dealer and take it to my trusty Indie Volvo shop.

[precopster]

Trust me this is absolutely an engine sensor condition.

[oragex]

Same, you may try the b4 cover + piston (video on youtube) but I don't see how this can block the rpm from going past 4000

[mp5802]

Yes, I agree that it's weird that the car get's limited to 4000rpm in 2nd at full throttle with no, or extremely delayed upshift to 3rd gear. Perhaps, in autoshift, the tranny software actually limits the rpms before upshifting? I don't know. I can hold the car manually in second to at least 5500 rpm, so wouldn't an engine sensor malfunction prevent that as well? Again, at partial throttle all shifting is fine.

At this point, I'm letting my Volvo guys drive it and give me their opinion. That can't hurt. I'll post an update after that (possibly 2 weeks from now, because I need the car next week). Thanks for all the replies.

[oragex]

Mine is the non turbo engine and if I crush the pedal it goes like this
This is the video with the servo cover, if you go this route, it talks about wear and 'grip' on the piston as well, plus wear inside the transmission hole is also a problem and can still 'grip' a new piston causing delay/kick when up-shifting 2nd to 3rd. It's not a bad job but it's the kind of job that will seem not to be doable at some point.
I'll put these together one day

[mp5802]

Mine is the non turbo engine and if I crush the pedal it goes like this...

Awesome. I'd love my V70 to go like that. Thanks for these videos. I actually have seen your servo cover repair videos on youtube. It appears that the first test is in auto-shift mode, right? The speedometer appears to be in kph (with actual mph in message display - how did you do that?). Cool.

So, my question is how did it shift before you did the repair? Did it not rev right up to redline or did it have different symptoms like hard upshift, delayed shift, etc?

[oragex]

Mine is the regular 5 speed transmission, this model doesn't have a manual mode like the Geartronic. As seen in the video, the repair is not quite complete.. I didn't fix the wear inside the transmission 'hole' where the piston slides into. I have only removed the wear from the piston. It fixed the 2nd to 3rd delay (and harsh engagement) which is now smooth except if I accelerate harder before the transmission warms up. Once the transmission is warmed, it shifts fine through the gears. Before the repair, the car would be hard shifting 2nd to 3rd in anything but the most gentle acceleration. The engine would also had no problems going to 6000 rpm before shifting to 3rd if the gas pedal was floored.

Worth mentioning the cover shown in the video was in good condition. The covers on all 2001-2002 had a washer (which is seen in the video) that would detach from the cover causing poor 2nd to 3rd shifting.

Side note, this is for the 5 speed regular transmission. I am not aware if the Geartronic transmission had the same B4 servo cover issue.

Worth reading
http://www.freewebs.com/howardsvolvos/driveline.htm
http://www.freewebs.com/howardsvolvos/d ... #182418795

[mp5802]

OK, so it would rev to 6000 even with the shifting issues. Well, maybe I have multiple issues. Thanks.

[mp5802]

UPDATE (problem solved): My independent Volvo shop did finally figure out that a poorly performing MAF sensor (no related codes) was the problem limiting my 01 V70 T5 to 4000 rpm. The car now revs up fantastically when floored, revving to near red-line through all the gears. Man, I had no idea how quick this car could be!

Evidently, these cars can drop an O2 sensor code (like mine did) if the MAF sensor is under-performing. According to the mechanic's notes, he drove it while watching the MAF values in VIDA under normal load, which were under 130GPS. After replacing the MAF, it now pulls 270GPS air flow. (I personally have never looked at these values in VIDA, so I'm taking his word for it.)

BTW, my car did not have other typical MAF symptoms that I've read about - idle hunting or rough, stalling, etc.

Thanks, everyone, for your interest in this problem. Hopefully, the above info. may help someone else out someday.