Login Register

V70R Overboosting/Knocking/Lack of power

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

Post Reply
NewKidOnTheBlock
Posts: 12
Joined: 7 July 2015
Year and Model: 1998 C70 T5 Coupe
Location: United Kingdom
Has thanked: 1 time

Re: V70R Overboosting/Knocking/Lack of power

Post by NewKidOnTheBlock »

The car drives much better now, but after driving a little more, boosting fairly hard I still notice a rattling sound from the engine which I've always suspected was "pinking" or pre-detonation sound, it sounds almost like someones ringing a small bell in the engine bay but you can just hear it over the engine sound, this happens earlier in the rev range and not just at peak boost when the power drops off worst. I do wonder if it's running lean through the range, maybe a bad map or maybe a full pressure or injector issue?

I've ordered myself a new waste gate actuator as it was pretty cheap and I thought that rules out another whole component but I'm going to have a look and see if I can get my injectors tested and cleaned if necessary, would rule out another thing. I've not looked into the TCV yet as I have been working on other projects today but I will try and get around to it over the weekend.

scot850
Posts: 14899
Joined: 5 April 2010
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
Has thanked: 1853 times
Been thanked: 1714 times

Post by scot850 »

The rasttling could also just be a broken or loose heat shield. Check the one on the exhaust manifold on the back of the engine where the bolt holes sometimes eat through, and then the one below the car above the cat which does the same.

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

Post Reply
  • Similar Topics
    Replies
    Views
    Last post