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1997 Volvo 850 surges in Park, feels like it wants to die

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moses3
Posts: 90
Joined: 15 Oct 2022, 13:28
Year and Model: 1997 850 GLT
Location: USA
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Post by moses3 »

When in park, the RPM swings from 800 to 1200 and the car feels like it's about to die out.

When I shift into Drive, the car idles normally.

Any ideas?
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scot850
Posts: 15487
Joined: 05 Apr 2010, 14:46
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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Post by scot850 »

It is a turbo, so chances at this age it has some air or vacuum leaks that are more noticeable at idle.

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold
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jreed
Posts: 1665
Joined: 08 Mar 2009, 05:43
Year and Model: '97 Volvo 855 GLT
Location: RTP, North Carolina
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Post by jreed »

I was thinking along the lines of vacuum leak too, as mentioned above, and also it could be a dirty or binding AIC (automatic idle control) valve. The AIC can be removed, inspected and cleaned if needed.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94
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