'98 S70 GLT 505 Code

[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

[scot850]

This link may help.

https://volvoforums.com/forum/volvo-850 ... ery-70626/

One point it makes is the throttle cable. I have seen issues with a cable with a broken strand causing the throttle to not return (adjusting the set point made no difference) and also lubing the mechanism and return spring to ensure dirt and lack of lube is not allowing the throttle to return to base.

Have you cleaned the throttle body?

Neil.