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Throttle issues

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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abscate
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Re: Throttle issues

Post by abscate »

Sounds like a vacuum leak. Braking hard uses up the vacuum so you put extra air into the engine which it doesn't like.

It's a drag but you have to check all the hoses and find the leaks and replace hoses
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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abscate
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Posts: 35282
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 »

The idle air control valve (IAC) hose is often reported having a split

There is also an elbow on the vacuum port under the intake manifold , right side of car, near the thermostat and radiator hose
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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MadeInJapan
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Post by MadeInJapan »

As abscate mentioned, you have to find that leak...if you don't find it in the lines he mentioned, follow the larger hose (most likely hardened) under the battery and on towards the driver's side under the windshield...there is a junction too along that line- closer to the left fender if my memory serves me right where two lines join together with a plastic connector. On mine, once upon a time, the plastic connector was broken. If still nothing, then I would suspect the brake vacuum pump itself which is not holding a seal.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

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