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1994 850 Turbo slipping transmission under hard acceleration

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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JoeyG85Z
Posts: 11
Joined: Thu Sep 13, 2018 5:12 am
Year and Model: 1994 850 Turbo
Location: NJ, USA

1994 850 Turbo slipping transmission under hard acceleration

Post by JoeyG85Z »

A few days ago I was trying to replace the wheel bearings on my 850. Before I bought the car the previous owner had both front CV axles replaced at a Firestone Auto Care place. As I found out, the check who we installed things must have put the axle nuts on with an impact gun and without aligning threads. I tried to remove the right side nut with the car still on the ground using a breaker bar and a 4-foot cheater pipe. I couldn't get the nut to budge, but something did turn. There was a loud clicking noise, almost like the sound when you try and put a moving car into park. I gave up and put everything back together.

This morning I was driving to work and I floored it from a stop. When it shifted from 1st to 2nd gear, there was a big jolt and a loud noise similar to a slipping serpentine belt. It only lasts for half a second, but it's very pronounced.
Any idea what might have happened? I've got the ATSG for the transmission, but it doesn't have a power flow diagram that tells me what is physically engaged when it's in park.

Thanks
Joe
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bmdubya1198
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Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
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Re: 1994 850 Turbo slipping transmission under hard acceleration

Post by bmdubya1198 »

Have you checked the transmission fluid?

Also a pro tip... never use Firestone Complete Auto Care for ANYTHING unless you're just buying a battery there. Those guys have no idea what they're doing. I've had countless bad experiences there at multiple locations, whether it was me or a family member or friend.
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
JoeyG85Z
Posts: 11
Joined: Thu Sep 13, 2018 5:12 am
Year and Model: 1994 850 Turbo
Location: NJ, USA

Re: 1994 850 Turbo slipping transmission under hard acceleration

Post by JoeyG85Z »

bmdubya1198 wrote: Sat Jul 20, 2019 3:19 pm Have you checked the transmission fluid?

Also a pro tip... never use Firestone Complete Auto Care for ANYTHING unless you're just buying a battery there. Those guys have no idea what they're doing. I've had countless bad experiences there at multiple locations, whether it was me or a family member or friend.
The fluid level and appearance are good.

Generally, the only things I'll let a shop do on one of my cars are tires and alignment. The previous owner is the one who subjected my car to this torture. The store I work at sells a lot of parts to Firestone, so I know exactly why to stay away from them
User avatar
bmdubya1198
Posts: 4334
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
Has thanked: 45 times
Been thanked: 182 times

Re: 1994 850 Turbo slipping transmission under hard acceleration

Post by bmdubya1198 »

Same, the only things I'm not equipped to do are tires and alignments. Otherwise, I love buying tools for anything else haha.

It may be a good idea to check those axles again and make sure they're installed properly. I recently had an issue with my S60 where an axle was broken (car didn't move at all though) and the parking pawl would grind whenever I put it in park. If you're driving it, that's not the problem, but it's worth a look to make sure the axles are fully inserted into the transmission.

That said, the squealing is a little odd, but I would start there just to rule it out.
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
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