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99' S70, 5-speed, surging idle

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

850 LPT
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99' S70, 5-speed, surging idle

Post by 850 LPT » Fri May 31, 2019 9:00 am

Hi folks,

I've been driving the new to me S70 around and it has an idle problem.
When I come to a stop and take it out of gear the idle starts surging and sometimes the engine cuts out.

From doing a little research on here this may be pointing to a bad ETM. The ETM is a yellow label unit and the car has 209k on it now. I was hoping this would last a little longer but maybe not.

Would you guys agree or is there something else I should be looking at first?

Thanks, Dirk


96' 850 sedan, base, auto, pewter/charcoal, 106k miles
99' S70, base, 5-speed manual, nautic blue/ tan, 209k miles
04' V70, auto, ash gold/ tan, 222k miles
05' V70, 5-speed manual, loaded, mistral green/ tan, 142k miles
79' Ford Capri S, Euro Spec 2.8 V6, T9 5-speed manual
58' Porsche Diesel Junior
13' Honda Odyssey :oops:

krenekj
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Re: 99' S70, 5-speed, surging idle

Post by krenekj » Fri May 31, 2019 11:41 am

When I suspected ETM issues, XmodeX was a great resource. They had a good flow chart one could follow to diagnose a failing ETM:

ETM Diagnostic Flow Chart.pdf
(142.07 KiB) Downloaded 29 times

Their techs are also very responsive to submitted questions and calls. That may have changed now that they only sell through authorized resellers, but it's worth a try.

https://xemodex.com/us/

Of course there are other issues that affect your idle, but if you suspect a ETM, they are a good resource to get better clarity on the ETM's functionality and impact to your issue.

Thanks.
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99 S70 NA 5sp
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850 LPT
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Re: 99' S70, 5-speed, surging idle

Post by 850 LPT » Fri May 31, 2019 12:43 pm

krenekj wrote:
Fri May 31, 2019 11:41 am
Of course there are other issues that affect your idle
I would like to learn more about this.

That flow chart looks to be very helpful.

I was just poking around their website and it looks like one could order from them directly again?

They suggest to replace the MAF along with the ETM. I don't know but that is getting pricey.

I need to drive the car more to complete the drive cycles and see what lights come on.
The battery went dead on me while I was working on the car and I am just now starting to drive it more regularily.

Thanks, Dirk


96' 850 sedan, base, auto, pewter/charcoal, 106k miles
99' S70, base, 5-speed manual, nautic blue/ tan, 209k miles
04' V70, auto, ash gold/ tan, 222k miles
05' V70, 5-speed manual, loaded, mistral green/ tan, 142k miles
79' Ford Capri S, Euro Spec 2.8 V6, T9 5-speed manual
58' Porsche Diesel Junior
13' Honda Odyssey :oops:

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abscate
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Re: 99' S70, 5-speed, surging idle

Post by abscate » Fri May 31, 2019 4:43 pm

Dirk, that 99 NA has an idle air valve like a 1998. Denso ingnition and air/ fuel management.

Give that a clean , then let’s look at fuel trims

At under 200k, leave the ETM alone for now


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Re: 99' S70, 5-speed, surging idle

Post by wizechatmgr » Fri May 31, 2019 4:58 pm

Could also try running it without the MAF connected I believe. Typically if performance improves it's a sign the MAF "might" be going bad.


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1999 V70 XC AWD - ~177k miles

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Re: 99' S70, 5-speed, surging idle

Post by 850 LPT » Fri May 31, 2019 6:22 pm

Thanks guys, I will investigate that idle control valve and clean if I can find it. Interesting about disconnecting the MAF, will try that too.


96' 850 sedan, base, auto, pewter/charcoal, 106k miles
99' S70, base, 5-speed manual, nautic blue/ tan, 209k miles
04' V70, auto, ash gold/ tan, 222k miles
05' V70, 5-speed manual, loaded, mistral green/ tan, 142k miles
79' Ford Capri S, Euro Spec 2.8 V6, T9 5-speed manual
58' Porsche Diesel Junior
13' Honda Odyssey :oops:

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abscate
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Re: 99' S70, 5-speed, surging idle

Post by abscate » Fri May 31, 2019 9:41 pm

850 LPT wrote:
Fri May 31, 2019 6:22 pm
Thanks guys, I will investigate that idle control valve and clean if I can find it. Interesting about disconnecting the MAF, will try that too.
Comes off the snorkel aft of the throttle body. Dumps air into the intake manifold by a long hose.
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