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'98 S70 GLT 505 Code

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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tommylg23
Posts: 10
Joined: 14 February 2023
Year and Model: 1998 s70 glt
Location: tn

'98 S70 GLT 505 Code

Post by tommylg23 »

Symptoms: In park or neutral, the idle is 1300; in drive the idle drops to approimately 950 - amazingly consistent RPM's; no driveability issues.

Steps taken: idle adjustment screw - no effect, new IACV (and the connection is good) prior to this issue; carb cleaner spray looking for vacuum leaks and around the throttle body - no effect; throttle cable adjustment; new TPS.

Questions: should I not see some effect from adjusting the idle screw; should I hear an audible click when operating the throttle butterfly by hand; where else can I look to solve this?

Thanks and Happy Sunday Fun Day,
Tommy
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abscate
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Posts: 35301
Joined: 17 February 2013
Year and Model: 99: V70s S70s,05 V70
Location: Port Jefferson Long Island NY
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Post by abscate »

Can you take a picture of the idle speed screw? I’m not sure these cars are supposed to have one
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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