|
S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
Information |
|
s80 slow startViews : 1010 Replies : 9Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Dec 1st, 2021, 07:35 | #1 |
Junior Member
Last Online: Mar 22nd, 2024 10:05
Join Date: Sep 2017
Location: MS
|
s80 slow start
Begining at low temperatures and sitting all night at below 5°C my s80 starts slow. Like you see in the video below, it will start with no problem but the engine hangs at 700rpm for a few seconds and only then it will start up the electricity and revs a little harder (which should be normal from the begining).
Readings from VIDA show no errors, glow plugs were changed last year, car starts normally when warm, battery was changed last year, fuel filter 10.000km ago with OEM, EGR and throttle body cleaned. I have no slightest clue what could be wrong. There's another problem when engine is warm (if that issue is somehow connected to this one). There's pretty noticeable rough idle when stopped and also RPMs fluctuate when coming to a stop. Interesting here is that rough idle at stop dissapears when I turn ON the AC or steer the wheels (put a load on the engine). Volvo s80 2.4D M66 2009 (D5244T5) @360.000 km Videos showing slow start: https://www.youtube.com/watch?v=NIP6n9P7DSA https://www.youtube.com/watch?v=jSIj2-B81Ts |
Dec 1st, 2021, 15:39 | #2 |
Premier Member
Last Online: Today 19:34
Join Date: Apr 2019
Location: Manchester
|
Doesn’t seem slow to me. I’d say that was actually quite normal in colder weather.
You do realise that when you press the start button, the car doesn’t start instantly? The car won’t start until the heater plugs are warm enough. This is why there’s a delay from pressing the start button before the car actually fires.
__________________
2007 S80 2.4 D5 - 110,000 miles |
Dec 2nd, 2021, 07:07 | #3 |
Junior Member
Last Online: Mar 22nd, 2024 10:05
Join Date: Sep 2017
Location: MS
|
That's not the case. I'm aware of the glow plugs delay, but if you look at the video, you'll see the delay after the engine turns. Yesterday I've open the oil fill cap and discovered the popping sound, so I think I've got a vacuum leak. This is regarding the warm engine problem (rough idle), but I don't think a vacuum leak has anything to do with the cold start problem?
|
Dec 2nd, 2021, 07:32 | #4 | |
Junior Member
Last Online: Mar 22nd, 2024 10:05
Join Date: Sep 2017
Location: MS
|
Quote:
|
|
Dec 2nd, 2021, 10:38 | #5 |
Premier Member
Last Online: Today 19:34
Join Date: Apr 2019
Location: Manchester
|
No, I never bothered with it. It won’t have anything to do with starting. The euro 4/euro 5 engines have a different vacuum system… they still have one, but its not the same as the euro 3.
As you’ve cleaned the EGR & replaced the fuel filter, then you may need to test the injectors by doing a leak back test. They can cause a lumpy idle. What about the alternator itself? Maybe you have an issue with that, or the auxiliary belt is old & could be slipping.
__________________
2007 S80 2.4 D5 - 110,000 miles Last edited by Kev0607; Dec 2nd, 2021 at 10:47. |
Dec 2nd, 2021, 12:05 | #6 |
Junior Member
Last Online: Mar 22nd, 2024 10:05
Join Date: Sep 2017
Location: MS
|
I'm familiar with the euro 3 vacuum system as I had to replace the vacuum lower engine mounts back on my s60. I'll do the leak back test tomorrow and report back.
As for the alternator - it charges the battery @14V so that should be good and belt was replaced 60.000 km ago. Last edited by urban60; Dec 2nd, 2021 at 12:29. |
Dec 2nd, 2021, 20:06 | #7 |
Junior Member
Last Online: Apr 6th, 2024 21:59
Join Date: Apr 2017
Location: Newport
|
This is probably nothing - but it seems odd to me to press the start button so lightly and leave the engine to fire. I tend to press and hold the start button until it starts. Like I say probably nothing, just seems odd to me. Like if you were twisting a key, you'd twist they key until it starts and then release. You wouldn't just twist the key all the way round and release as soon as you met the stop.
__________________
Volvo V70 D5 205 Auto Dunno much about, so going to have a mooch around. |
Dec 3rd, 2021, 09:11 | #8 | |
Premier Member
|
Quote:
You refer to old cars, where it was up to the driver to understand when the engine had started. And also, for diesels, it was up to the driver to observe the duration of glowing, and not turn to start until glowing was completed. The only time you need to keep the button pressed to start is in emergencies, like if the clutch sensor on a car with manual gearbox isn't working. Then you have to confirm that it's OK to start by keeping the button pressed until the engine starts. |
|
Dec 3rd, 2021, 09:39 | #9 | |
Premier Member
Last Online: Today 19:34
Join Date: Apr 2019
Location: Manchester
|
Quote:
I don’t think euro 4 P3’s have vacuum mounts, apart from the XC90. My Dad’s V70 P3 is the same - No vacuum mounts.
__________________
2007 S80 2.4 D5 - 110,000 miles |
|
May 26th, 2022, 07:10 | #10 |
Junior Member
Last Online: Mar 22nd, 2024 10:05
Join Date: Sep 2017
Location: MS
|
So I want to get back to this as I resolved some things.
The "slow start" problem was due to an old/lazy starter motor. I've changed the unit with aftermarket Bosch and also replaced the battery and now car starts like a champ. Rough idle problem went away when I added 2x 1liter (two separate times) of Antigrippante 25 additive in the tank when there was only 10liter of diesel in it. Inspecting the injector return pipe made me realized we have bad diesel in my country as there were a lot of rusty pieces in it - meaning there's water in it. Last edited by urban60; May 26th, 2022 at 07:35. |
Tags |
fluctuating, rough idle, vacuum |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|