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RPM fluctuation at idle

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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Rondo
Posts: 107
Joined: 29 January 2013
Year and Model: 2000 S70 GLT/SE
Location: Tampa area, Florida

RPM fluctuation at idle

Post by Rondo »

I've been noticing a significant fluctuation in rpms (200-300) while my car is idling with the a/c on. Stops when I turn it off. I just had the a/c replaced a little over a year ago and have just started noticing this. Any ideas? The work is still under warranty but I don't want the shop to tell me it's something with the engine when it's not. Thanks.
Nautic Blue '00 S70 GLT/SE, RIP @ 273625 Miles
Black '00 S70 GLT/SE, 141K Miles
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JRL
Posts: 9350
Joined: 22 November 2005
Year and Model: Several
Location: 19333
Been thanked: 16 times

Post by JRL »

ETM
MAF sensor
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.
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Rondo
Posts: 107
Joined: 29 January 2013
Year and Model: 2000 S70 GLT/SE
Location: Tampa area, Florida

Post by Rondo »

ETM got done with the recall. I'll take a look at the MAF sensor. Thanks.
Nautic Blue '00 S70 GLT/SE, RIP @ 273625 Miles
Black '00 S70 GLT/SE, 141K Miles
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