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Idle Surge every 20 seconds in '01 V70 XC

 
Stephen Henning
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      28-06-2008
My '01 V70 XC has a continuing problem where the idle momentarily surges
every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
when I am coasting to a stop or braking. The surge causes the car to
lurch forward. It feels very unsafe. I have gone to the Volvo dealer
about it and the mechanic says he has the latest computer updates loaded
and has no idea where to start. It has 106,000 miles and has always
received scheduled dealer service. This has the low pressure turbo 5
cylinder engine.
--
Cheers, Steve Henning in Reading, PA, USA
Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
The '67,'74,'79,'87,'95 and '01 through European Delivery.
http://rhodyman.net/homevo.html
 
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blurp
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      02-07-2008
On Sat, 28 Jun 2008 09:31:18 -0400, Stephen Henning <(E-Mail Removed)>
wrote:

>My '01 V70 XC has a continuing problem where the idle momentarily surges
>every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
>when I am coasting to a stop or braking. The surge causes the car to
>lurch forward. It feels very unsafe. I have gone to the Volvo dealer
>about it and the mechanic says he has the latest computer updates loaded
>and has no idea where to start. It has 106,000 miles and has always
>received scheduled dealer service. This has the low pressure turbo 5
>cylinder engine.


I found that as my AC Compressor was starting to seize its clutch
would put a dragging load on the engine and then disengage, causing
the engine to race a bit as it adjusted to the freed load.

I don't know how best to test this except to listen for the compressor
engaging/disengaging while watching the tach.

Cheers,
blurp
 
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Stephen Henning
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      17-07-2008
blurp <(E-Mail Removed)> wrote:

> Stephen Henning <(E-Mail Removed)> wrote:
>
> >My '01 V70 XC has a continuing problem where the idle momentarily surges
> >every 20 seconds. The surge is a couple hundred RPM. It is disconcerting
> >when I am coasting to a stop or braking. The surge causes the car to
> >lurch forward. It feels very unsafe. I have gone to the Volvo dealer
> >about it and the mechanic says he has the latest computer updates loaded
> >and has no idea where to start. It has 106,000 miles and has always
> >received scheduled dealer service. This has the low pressure turbo 5
> >cylinder engine.

>
> I found that as my AC Compressor was starting to seize its clutch
> would put a dragging load on the engine and then disengage, causing
> the engine to race a bit as it adjusted to the freed load.
>
> I don't know how best to test this except to listen for the compressor
> engaging/disengaging while watching the tach.


Thanks for the info. I will see if I can coordinate the surge with the
AC switching. Shutting off the AC does seem to prevent it. Your
explanation lets me know why it is much more pronounced than normal.
--
Cheers, Steve Henning in Reading, PA, USA
Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
The '67,'74,'79,'87,'95 and '01 through European Delivery.
http://rhodyman.net/homevo.html
 
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