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Volvo newbie care help

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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Re: Volvo newbie care help

Post by FLXC90 » Fri Jan 12, 2018 6:30 pm

Good first result. As you have found, this forum and other related material can get you through this! Search the PCV threads here and you'll see how it works, how it goes bad, and how to fix it.

Do you and Mum have service records for the car. A GREAT resource.

Current Volvos:
1998 V70 T5, 112k sat 5 years, still in mechanical coma (for sale )
2004 XC90 T6 AWD: 186k, 60 on transaxle ( traded in today)
1998 POS70 N/A: DD/training aid, 236k but really about 240k, I think...ABS module( passed on to son who sold it)


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Re: Volvo newbie care help

Post by RickHaleParker » Fri Jan 12, 2018 6:55 pm

I have to admit not knowing what the idle air control or PCV is or their purpose.

The idle air control is a second throttle body. Its purpose is the same as the main throttle body, regulate the engine speed but it only kick in when the engine is at idle. The smaller size of the idle air control allows for finer control then the main throttle body.

Positive Crankcase Ventilation, a one way passage for gases to escape in a controlled manner from the crankcase. Purpose keep gas pressure from building up in the crankcase.

1997 S90, B6304S, AW30-42, Bosch Motronic 4.4
1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4
2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000.

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Re: Volvo newbie care help

Post by wlkstout » Fri Jan 12, 2018 7:25 pm

I had an Oldsmobile once that the Throttle Positioning Sensor went bad on and would give me erratic idling as well. I am not sure of the IAC on Volvo's exact makeup, just bought my Volvo last week, but on the Olds when you removed the IAC they had an o-ring around them. Onetime the o-ring had disintegrated and caused a slight vacuum leak on it. Also maybe a cleaning of the IAC and throttle body might help. Just take them apart and clean with brake fluid or throttle body cleaner. Welcome from another newbie. Good luck.

1998 V70 SW 2.4l na
1992 Olds Cutlass Supreme 3.1l
1994 Dodge Dakota 3.9l
1993 GMC 1500 5.7l

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