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Marco's 2003 V70 T5 journey
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- Posts: 329
- Joined: Tue Sep 28, 2010 9:44 pm
- Year and Model: 2003 V70T5
- Location: Christchurch,New Zealand
- Has thanked: 3 times
- Been thanked: 0
Re: Marco's 2003 V70 T5 journey
Well folks, it’s been a while since I’ve posted any progress so I guess it’s time for a catch up. I have a good excuse though. We’ve been very busy with garden and landscaping projects with Spring being upon us.
I took a punt on the boost pressure sensor not giving the correct information and it looks like I was on to something. I fitted a new one, went for a drive and... WOOOOOAAAHHHH! the boost is back in town!
There is still slight jerkiness at low throttle though, but in BREAKING NEWS it appears that I have a leaking brake booster! Sigh. This could be contributing to the jerky herky? Thoughts?
I took a punt on the boost pressure sensor not giving the correct information and it looks like I was on to something. I fitted a new one, went for a drive and... WOOOOOAAAHHHH! the boost is back in town!
There is still slight jerkiness at low throttle though, but in BREAKING NEWS it appears that I have a leaking brake booster! Sigh. This could be contributing to the jerky herky? Thoughts?
The Fleet:
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
-
- Posts: 329
- Joined: Tue Sep 28, 2010 9:44 pm
- Year and Model: 2003 V70T5
- Location: Christchurch,New Zealand
- Has thanked: 3 times
- Been thanked: 0
Re: Marco's 2003 V70 T5 journey
I have done some more investigating.
I ordered a mechanical boost gauge some time ago and this morning I have fitted it (temporarily)
Idle vacuum (hot) 16in hg
Removed rubber tail from brake booster and capped hard line, idle vacuum 18in. We have a leak (booster is leaking) The joint between the rubber hose and the plastic plug from the booster was quite loose. I tightened the oetiker clamp as much as I could and pressure tested it under water with my Mityvac (everyone should have one) and no more leak. I also tested the hard lines and the check valve and all is well, no leaks, check valve works perfectly.
Reconnected the booster, and idle vacuum still 18 in. Win! ( booster still leaks down after 2 minutes though, so sad face)
I am confident the booster vacuum leak is not significant enough from an engine vacuum point of view to cause any running issues.
Right, now let’s see how much boost we’re actually making.. turns out quite a LOT!
Under moderate load (careful throttle application) it builds to and holds at 11-12psi
Floor it and it goes to 15 psi and sloooooowly comes back to 11
Nail the throttle and pin it and it goes over 20 and doesn’t come back!!
Am I getting enough wastegate travel? Let’s find out. Bridge the yellow and red TCV lines and you have full boost straight to the wastegate actuator. Test drive again and maximum boost tops out at 9 psi, so no problem there me thinks. That leaves the TCV. It’s brand new. But wait, I have a spare. Nope same massive overboost.
Help me out here please... In the past, I have experienced failing TCV on a first gen V70 and older BCS on one of my 850’s. This tended to result in a boost deficit, not a surplus, and that seems to be what others report also.
What is going on?
I ordered a mechanical boost gauge some time ago and this morning I have fitted it (temporarily)
Idle vacuum (hot) 16in hg
Removed rubber tail from brake booster and capped hard line, idle vacuum 18in. We have a leak (booster is leaking) The joint between the rubber hose and the plastic plug from the booster was quite loose. I tightened the oetiker clamp as much as I could and pressure tested it under water with my Mityvac (everyone should have one) and no more leak. I also tested the hard lines and the check valve and all is well, no leaks, check valve works perfectly.
Reconnected the booster, and idle vacuum still 18 in. Win! ( booster still leaks down after 2 minutes though, so sad face)
I am confident the booster vacuum leak is not significant enough from an engine vacuum point of view to cause any running issues.
Right, now let’s see how much boost we’re actually making.. turns out quite a LOT!
Under moderate load (careful throttle application) it builds to and holds at 11-12psi
Floor it and it goes to 15 psi and sloooooowly comes back to 11
Nail the throttle and pin it and it goes over 20 and doesn’t come back!!
Am I getting enough wastegate travel? Let’s find out. Bridge the yellow and red TCV lines and you have full boost straight to the wastegate actuator. Test drive again and maximum boost tops out at 9 psi, so no problem there me thinks. That leaves the TCV. It’s brand new. But wait, I have a spare. Nope same massive overboost.
Help me out here please... In the past, I have experienced failing TCV on a first gen V70 and older BCS on one of my 850’s. This tended to result in a boost deficit, not a surplus, and that seems to be what others report also.
What is going on?
The Fleet:
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
-
- Posts: 329
- Joined: Tue Sep 28, 2010 9:44 pm
- Year and Model: 2003 V70T5
- Location: Christchurch,New Zealand
- Has thanked: 3 times
- Been thanked: 0
Re: Marco's 2003 V70 T5 journey
Today I thought, what if the wastegate initial pressure is wrong? I have quadruple checked this but it’s easy to do. It’s still set at 4.5 psi exactly. What if I do something rash, like lengthen the rod 3 full turns? Well, 3 turns takes the initial pressure to exactly zero.
Predictably that made it a bit more sluggish off the line but it still overboosts the same as before.
I didi a few more test runs and it’s really strange. Pulling in third gear it holds 11psi holding, holding, holding and then suddenly as if the car’s brain says “oh, I give up!” there’s a great rush as the boost runs away.
Predictably that made it a bit more sluggish off the line but it still overboosts the same as before.
I didi a few more test runs and it’s really strange. Pulling in third gear it holds 11psi holding, holding, holding and then suddenly as if the car’s brain says “oh, I give up!” there’s a great rush as the boost runs away.
The Fleet:
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
- abscate
- MVS Moderator
- Posts: 19216
- Joined: Sun Feb 17, 2013 5:54 pm
- Year and Model: 99T5 ,99S70,2005V70
- Location: NYC, ALBANY NY
- Has thanked: 230 times
- Been thanked: 763 times
Re: Marco's 2003 V70 T5 journey
Yikes. The only thing stopping you from blowing a rod is the CBV. I hope that is working well.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
-
- Posts: 329
- Joined: Tue Sep 28, 2010 9:44 pm
- Year and Model: 2003 V70T5
- Location: Christchurch,New Zealand
- Has thanked: 3 times
- Been thanked: 0
Re: Marco's 2003 V70 T5 journey
Brand new, fitted recently, but you never know. Actually, maybe it’s not working, because I don’t think it’s meant to hold 20+ psi (stock part)
The Fleet:
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
- RickHaleParker
- Posts: 3214
- Joined: Mon May 25, 2015 2:30 pm
- Year and Model: See Signature below.
- Location: Kansas
- Has thanked: 3 times
- Been thanked: 376 times
Re: Marco's 2003 V70 T5 journey
B5234T3 Maximum boost pressure: 184 ± 10 kPa @ 5100 RPM. (26.687 ± 1.450 PSI)Marcobrick wrote: ↑Mon Nov 11, 2019 6:40 pmI don’t think it’s meant to hold 20+ psi (stock part)
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
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
-
- Posts: 329
- Joined: Tue Sep 28, 2010 9:44 pm
- Year and Model: 2003 V70T5
- Location: Christchurch,New Zealand
- Has thanked: 3 times
- Been thanked: 0
Re: Marco's 2003 V70 T5 journey
Is that absolute manifold pressure? It would make sense because that would equal about 12psi of boostRickHaleParker wrote: ↑Tue Nov 12, 2019 7:50 am
B5234T3 Maximum boost pressure: 184 ± 10 kPa @ 5100 RPM. (26.687 ± 1.450 PSI)
The Fleet:
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
2003 V70 T5
2014 Nissan Leaf
1973 Fiat 125
1970 MGB GT
Previously:
1996 850R sedan
1994 850T5 Sedan
1995 850 Turbo Wagon
1998 V70T5
Favourite line: "How hard can it be?"
- abscate
- MVS Moderator
- Posts: 19216
- Joined: Sun Feb 17, 2013 5:54 pm
- Year and Model: 99T5 ,99S70,2005V70
- Location: NYC, ALBANY NY
- Has thanked: 230 times
- Been thanked: 763 times
Re: Marco's 2003 V70 T5 journey
I think that is absolute pressure as you note. Good catch.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
- RickHaleParker
- Posts: 3214
- Joined: Mon May 25, 2015 2:30 pm
- Year and Model: See Signature below.
- Location: Kansas
- Has thanked: 3 times
- Been thanked: 376 times
Re: Marco's 2003 V70 T5 journey
It does not say atmospheric or absolute. However 27 absolute would correlate with observed 10 - 12 atmospheric.Marcobrick wrote: ↑Wed Nov 13, 2019 12:34 amIs that absolute manifold pressure? It would make sense because that would equal about 12psi of boost
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
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
- abscate
- MVS Moderator
- Posts: 19216
- Joined: Sun Feb 17, 2013 5:54 pm
- Year and Model: 99T5 ,99S70,2005V70
- Location: NYC, ALBANY NY
- Has thanked: 230 times
- Been thanked: 763 times
Re: Marco's 2003 V70 T5 journey
Its a quirk of Volvo that everything is measure in absolute pressure in software and diagnostics, isnt it?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
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