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Cold hard start warm no start

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

Kerpre
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Year and Model: 2000 c70
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Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 6:32 pm

Hi guys so my infamous 2000 C70 is finally running after it’s head replacement.

I am getting an intermittent nonstart or hard start when cold and she just will not start again of it has been running( if I go to fill her up etc).

If it starts when cold I have to feather the throttle for a second or 2 and then she idles fine.

However when she has been running for a while and I got to restart it just won’t, I try starter fluid and it will stumble to life and then die within a second.

Once running it drives fine, fuel economy seems a bit higher 23L/100km.

Any suggestions on what to look for?

I can confirm crank sensor and cam sensors are good.
I have spark
Fuel pressure is 55psi at rail and the injectors are pulsing
Battery is good
No vacuum leaks that I have been able to find

Please help I love driving this car!



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wizechatmgr
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Year and Model: 1999 V70 XC AWD 2.4T
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Re: Cold hard start warm no start

Post by wizechatmgr » Sun May 26, 2019 8:47 pm

Temp sensor by thermostat going bad? VAC leak?


Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~177k miles

Kerpre
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 8:57 pm

My thought exactly, have a new temp sensor on its way, attacking the cheaper stuff first. Thanks you



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wizechatmgr
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Re: Cold hard start warm no start

Post by wizechatmgr » Sun May 26, 2019 10:53 pm

Kerpre wrote:
Sun May 26, 2019 8:57 pm
My thought exactly, have a new temp sensor on its way, attacking the cheaper stuff first. Thanks you
That can actually be tested with a multimeter so you don't just start throwing money at the car randomly...

That said, if it is over 10 years old then I'd just replace it.


Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~177k miles

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RickHaleParker
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Re: Cold hard start warm no start

Post by RickHaleParker » Sun May 26, 2019 11:09 pm

wizechatmgr wrote:
Sun May 26, 2019 10:53 pm
That can actually be tested with a multimeter so you don't just start throwing money at the car randomly...
ECTS.PNG
R ~ 5321.65903 + (-144.171747 T) + (0.95432339 T²)

Example T = 10°C:
R ~ 5321.65903 + (-144.171747 10) + (0.95432339 10²)
R ~ 5321.65903 + (-1441.71747) + (0.95432339 * 100)
R ~ 5321.65903 + (-1441.71747) + (95.432339)
R ~ 3975.373899

~ 7.5% error from the chart.
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Last edited by RickHaleParker on Sun May 26, 2019 11:36 pm, edited 2 times in total.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 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.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

Kerpre
Posts: 47
Joined: Tue Jul 31, 2018 2:35 pm
Year and Model: 2000 c70
Location: New Zealand
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 11:14 pm

Your a Gem Rick, thanks heaps mate, I’ll go have a look now



Kerpre
Posts: 47
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 11:25 pm

Ok so I got 3k ohms at 16 Celsius
Car started so letting it idle to operating temp and will test again



Kerpre
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 11:34 pm

While i can get it to start, this could be a completely different problem or help solve the current. Video is at idle in park, idles perfect. When I put it into gear it stumbles and carries on, not severe but enough to take notice
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Kerpre
Posts: 47
Joined: Tue Jul 31, 2018 2:35 pm
Year and Model: 2000 c70
Location: New Zealand
Has thanked: 1 time
Been thanked: 1 time
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 11:41 pm

At operating temperature (needle won’t go any higher)
I get 0.5k ohm
I also get 0.5v on one pin and 5v on he other



Kerpre
Posts: 47
Joined: Tue Jul 31, 2018 2:35 pm
Year and Model: 2000 c70
Location: New Zealand
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Kerpre

Re: Cold hard start warm no start

Post by Kerpre » Sun May 26, 2019 11:49 pm

Ok sorry for bombarding the page, I only get a small amount of time to work on car each day.
I turned car off, then straight back on, no issues, again, and again it was fine, without removing key

I removed the key, locked it, open and tried to start, no go. Maybe this i fo is of use to anyone in the know?



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