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Vibration under moderate acceleration

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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dbm123
Posts: 176
Joined: 1 December 2010
Year and Model: 1999 V70 GLT
Location: Ohio

Vibration under moderate acceleration

Post by dbm123 »

This past weekend, I noticed a bit of strange behavior from my 99 V70 GLT. When pulling off from a side street onto the main road, if I increase the RPMs by accelerating to around 3000 RPMs, The transmission seems smooth but I sense some engine vibration and I can feel it in the steering wheel as it accelerates. This is repeatable every time. Could this be a motor mount issue or should I be thinking about something else?
Current Volvos:
2004 C70 HPT (wife)
2002 S40 1.9T (daughter)
2001 V70 XC (daughter)
1999 V70 GLT (now dead)
1998 V70 GLT (son)
The other car: 2003 Saab 9-3 SE Convertible (mine)

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alschnertz
Posts: 701
Joined: 29 April 2011
Year and Model: 1995 854T
Location: Connecticut
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Post by alschnertz »

My first guess would also be a motor mount.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

micah861
Posts: 144
Joined: 11 September 2009
Year and Model: 98 S70, 98 S70 T5M
Location: Cheyenne, WY

Post by micah861 »

Agreed, probably a mount. Does it vibrate at the same rpm in neutral?
Red 98 S70 T5M
Black 98 S70 N/A

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erikv11
Posts: 11800
Joined: 25 July 2009
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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Post by erikv11 »

Check the "front engine mount" it is the one below the crank pulley, accessible through the passenger side wheel well. Good chance it has collapsed and the engine is sitting on the subframe.
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

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