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What did you do to your Volvo today?

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

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bmdubya1198
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Re: What did you do to your Volvo today?

Post by bmdubya1198 » Sun Jan 12, 2020 8:04 am

You checked the wastegate with the pressure setting, correct? Most Mityvac models only do vacuum.

I believe the GLT should be set to 2 PSI, but I'd have to confirm that.
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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99commutervolvos70
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Re: What did you do to your Volvo today?

Post by 99commutervolvos70 » Sun Jan 12, 2020 8:32 am

bmdubya1198 wrote:
Sun Jan 12, 2020 8:04 am
You checked the wastegate with the pressure setting, correct? Most Mityvac models only do vacuum.

I believe the GLT should be set to 2 PSI, but I'd have to confirm that.
Yes, the mightyvac I used only has a vacuum gauge on it. I basically wanted to check if the diaphragm was leaking, which it is not. When i applied pressure to the wastegate actuator it moved and held.

This issue just happend recently, so I am thinking it may not be a setting issue. I haven't touched anything turbo related in the 60k that I have had it. The car has over 277k on it. The wastegate actuator DOES look to be very shiny and "new" looking (doesn't look like it has 277k on it), would love to get one of those deals from Ipd and check the base setting.

For now, I think I will just hook the wastegate actuator directly to the port on the turbo and see if it reaches the 2psi setting. I installed a new pierburg TCV and a Bosch Boost sensor.

I drive this car every day a minimum of 80 miles a day, so I will eventually get to the bottom of it :D

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bmdubya1198
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Re: What did you do to your Volvo today?

Post by bmdubya1198 » Sun Jan 12, 2020 11:38 am

Probably something simple, but a pain to pinpoint. That's usually the case with boost issues!
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99commutervolvos70
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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99commutervolvos70
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Re: What did you do to your Volvo today?

Post by 99commutervolvos70 » Sun Jan 12, 2020 2:19 pm

bmdubya1198 wrote:
Sun Jan 12, 2020 11:38 am
Probably something simple, but a pain to pinpoint. That's usually the case with boost issues!
Well I unplugged my TCV electrically, which should directly link the red and yellow vacuum hoses. Now I get progressive boost to about 3psi with no spikes at all. So either my new TVS is defective or my original one was defective and I didn't notice it because my wastegate actuator is not adjusted properly...

So I will have to do some searching to see what the spec is for the LPT turbo. Perhaps someone previously replaced the wastegate actuator that was meant for a T5 that is set at 4 psi?

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Re: What did you do to your Volvo today?

Post by abscate » Sun Jan 12, 2020 6:46 pm

Is that right? Is default no power setting on a TCV connecting full boost to wastegate?

I though it dumped to blue/ Snorkel
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Re: What did you do to your Volvo today?

Post by 99commutervolvos70 » Sun Jan 12, 2020 6:58 pm

abscate wrote:
Sun Jan 12, 2020 6:46 pm
Is that right? Is default no power setting on a TCV connecting full boost to wastegate?

I though it dumped to blue/ Snorkel
I believe when it is disconnected electrically, it defaults to full pressure to the wastgate (same as connecting the wastegate actuator directly to the turbo), which will keep it closed until it reaches whatever the wastegate rod was initially set at.
It is slower to build boost with it bypassed, but it does not overboost.

It did set a CEL on my 2nd trip P0234. Tomorrow I plan on checking the wastegate setting with a pressure gauge teed into my mightyvac. I have a feeling it will be around 3 to 4 psi. I guess it is supposed to be around 1.8 psi for my LPT.

It dumps when it is energized which keeps the wastegate shut, which increases boost.
I've been studying this system for a few days now :D

Moderators can move this if it is posted in the wrong area.

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bmdubya1198
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Re: What did you do to your Volvo today?

Post by bmdubya1198 » Sun Jan 12, 2020 8:56 pm

The TCV stays open when it is not connected to the ECU. The TCV is closed by the ECU grounding the constant voltage (I believe), allowing boost to build. 100% duty cycle is full boost, 0% is wastegate pressure.

LPT WG setting may be 1.8 PSI now that you mention it. I had a chart somewhere...
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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erikv11
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Re: What did you do to your Volvo today?

Post by erikv11 » Sun Jan 12, 2020 11:39 pm

I rarely post any pics of my cars - here's one!

The V70 is 427 black, here it is the day after finishing a 2,000 mile round trip over the December holiday. I like the 427 color, it edges a bit toward gray. The 850 R in the background is standard 426 Black, you can see the color difference somewhat here.
IMG_9338.jpeg
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'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: What did you do to your Volvo today?

Post by abscate » Mon Jan 13, 2020 4:45 am

Are those the Perfo or Columba wheels on the V70? Paint looks incredible on a decades oldcar(s)
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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raivis_rsn
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Re: What did you do to your Volvo today?

Post by raivis_rsn » Mon Jan 13, 2020 8:46 am

Columba

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