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1999 V70 NA MT w/ hard to figure out idle issue

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.

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MrKrypton
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1999 V70 NA MT w/ hard to figure out idle issue

Post by MrKrypton » Mon Dec 16, 2019 11:50 am

Hi Guys,

Sorry for the long story, but I'm having a hard time figuring out a persistent issue with my V70 and I'm stumped. Purchased the car last summer when I moved on from my long time MT 850. Reading the forums one issue that constantly kept popping up was the ETM. I removed it and had it rebuilt by XeMODeX as I seemed to be having idle dips when I coasted up to a stop in neutral. With the rebuilt unit I continue to have idle drops. Seems to be most common when the engine is just coming up to temperature for the first time that day. From there on it's a 50/50 proposition as to whether it acts up again that day. A month ago it threw a CEL but continued to drive fine. A week later on its first start of the day, it threw a ETS light with poor idle and the smell of unburnt fuel. I had it towed to a Volvo Indy and they replaced the CTS with a used unit. They found no faults with the ETM. They did find an active IMM-321 fault (might be related to the door chime and courtesy light fuses I pulled months ago), and a non-active ECM-4038 & 250A fault. Drove the car home and it still had coming to a stop idle issues in neutral.

Took the car to the Volvo dealer and they found no codes, performed a test on the ETM that it passed and said the PCV system is OK. They could not repeat my idle drop issue despite it being a multiple times a day occurrence for me.

Ultimately I'm hoping someone has a few leads or some insight as to what may be occurring. I have the ability to wrench and have done a few repairs on this car including the ETM install, but will send the work out this time of year for anything big. Tiny, unheated garage in December Calgary is unpleasant.

Thanks for your time,

Mike

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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by RickHaleParker » Mon Dec 16, 2019 4:41 pm

Smoke test the intake system for leaks.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by Empigt » Mon Dec 16, 2019 5:01 pm

Starting fluid around your vacuum lines and intake gaskets to check for leaks works too. If it revs up you are close to the leak.

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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by abscate » Tue Dec 17, 2019 5:09 am

What’s the CTS unit they replaced?
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MrKrypton
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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by MrKrypton » Tue Dec 17, 2019 12:54 pm

Thanks guys,

I'll either get it smoked tested or play around with some starting fluid. Probably not uncommon for a vehicle this age to have a few intake leaks. I do suspect it has a slight exhaust leak at the flex joint on the exhaust manifold.

CTS is the coolant temp sensor.

Mike

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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by abscate » Mon Dec 23, 2019 6:40 am

The drop or stumble on run-down (foot off gas, gear in neutral) is indicative of a vacuum leak on ETM cars, I remember figuring out exactly why this, as on an ETM car the throttle closed position is negotiated between the ECM and ETM in software. My CRJS has flared up and I can't find my documentation on this though.

You do have an Idle Air control valve on a 99 NA though, at least if it has DENSO engine management. Good place to check for leaks.

You either build a smoke tester or remove everything and do a Visual Audible Tactile (tm) inspection - in which case you just put new hoses on anyway.

MVS will give you a mild keyboard shock if you post any phrase sufficiently close to

"I looked at the vacuum hoses and they look ok"
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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by volvolugnut » Mon Dec 23, 2019 9:15 am

Rule Number 2 of Volvos: Vacuum leaks are invisible. They cannot be found where you are looking.
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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by matthew1 » Mon Dec 23, 2019 9:20 am

abscate wrote:
Mon Dec 23, 2019 6:40 am

MVS will give you a mild keyboard shock if you post any phrase sufficiently close to

"I looked at the vacuum hoses and they look ok"
:lol: :lol: :lol:

Vacuum leaks are difficult. That’s putting it gently.
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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by RickHaleParker » Mon Dec 23, 2019 2:19 pm

volvolugnut wrote:
Mon Dec 23, 2019 9:15 am
Rule Number 2 of Volvos: Vacuum leaks are invisible. They cannot be found where you are looking.
Vacuum leaks violate the laws of quantum physics ... they cease to exist when you observe them.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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Re: 1999 V70 NA MT w/ hard to figure out idle issue

Post by smacknab » Mon Dec 30, 2019 1:44 pm

Following this as i also have idle dips when coasting to a stop in neutral, on my 99 s70 na with manual transmission. Hope to hear what you find!

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