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Tried to use injector cleaner tool at the schrader valve

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

800artfreed
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800artfreed

Tried to use injector cleaner tool at the schrader valve

Post by 800artfreed » Fri Nov 08, 2019 10:34 am

I have an external fuel injector cleaner tool. It is the one that uses air pressure to force cleaner into the injectors through the fuel rail while running the engine. You have to remove the fuel pump relay. I successfully did this on my 1999 S70-GLT non-return fuel system but the 1998 is a return style fuel system. The procedure is to set up the air pressure at less than the fuel pump pressure to prevent the cleaner from being forced back to the fuel tank. I used 40 psi at the cleaner connected to the schrader valve.

Unlike the 1999, on the 98 I heard a strange vibrating (moaning) noise and the car did not run. BTW because of the cable based throttle mechanism on the 98 it is more difficult to attach an adapter to the schrader valve (90 degree connector would be helpful). I took out the valve core and clamped an open ended fuel hose adapter line in my kit to the schrader valve allow the hose to clear the throttle cable bracket.

When the engine did not run I put everything back together. When I went to empty to injector cleaner container it was EMPTY! The strange noise I heard was the cleaning fluid being pushed back through the return line and fuel pressure regulator!

Does anyone know what the fuel rail pressure is at idle on a 1998 S70-T5? Or does anyone have other hints on using this type of tool on a 1998? It worked great on the 1999 S70-GLT. Just wish it was as easy on the 1998.



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bmdubya1198
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Re: Tried to use injector cleaner tool at the schrader valve

Post by bmdubya1198 » Fri Nov 08, 2019 3:57 pm

Hmm... I must admit, I've never heard of one of these injector cleaners. Interesting.

Rail pressure on a '98 should be around 43 PSI, if the information I've seen is correct.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
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- Never should have sold it


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misha
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Re: Tried to use injector cleaner tool at the schrader valve

Post by misha » Fri Nov 08, 2019 4:12 pm

It is correct.
-43.5psi on 1st prime without starting the engine
-at idle ...everything around 35psi is acceptable
-43.5 psi at WOT
For FPR at fuel rail (M4.3,LH 3.2 jetronic).

M4.4 management,according to Volvo,must have a constant 43.5psi all the time.
It have FPR near the fuel filter and just fuel pressure damper at fuel rail.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

800artfreed
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800artfreed

Re: Tried to use injector cleaner tool at the schrader valve

Post by 800artfreed » Sat Nov 09, 2019 11:30 am

Thanks for the info. I will run a test with the cleaning machine hooked up to see what it shows as the operating pressure at idle on the rail. Then I will set the air pressure supply for 5psi lower then that. I will use gasoline to test operations so as to not waste another $12 bottle of cleaner. If that works I will do the cleaning process with the injector cleaning chemical.

Does the return line have a soft rubber section that can be clamped shut before the FPR?

Today the temperature is in the 30s so I will try something tomorrow when it's a bit warmer. Cheers.



800artfreed
Posts: 50
Joined: Tue Apr 03, 2018 3:49 pm
Year and Model: 98 S70T5; 99 S70GLt
Location: Washington DC
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800artfreed

Re: Tried to use injector cleaner tool at the schrader valve

Post by 800artfreed » Sat Nov 09, 2019 11:34 am

I reread misha's post. Thanks for the information. I believe the critical information is at idle the rail pressure is only 35psi. I was setup at 40psi. So I can see that with the vacuum levels applied to the FPR it opened up and allowed all the cleaner to go back to the tank. As I posted above I will run some tests and report back. Thanks again.



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misha
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Re: Tried to use injector cleaner tool at the schrader valve

Post by misha » Sat Nov 09, 2019 4:35 pm

'97 & '98 s,v70 T5 and n/a are ALL M4.4 from the factory.
So....fuel pressure should be constantly 43.5 psi all the time.
Variations in fuel pressure are for M4.3 and LH 3.2 Jetronic which have FPR on the fuel rail.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

User avatar
bmdubya1198
Posts: 3375
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: '98 V70 GLT
Location: Charlotte, NC
Has thanked: 30 times
Been thanked: 106 times
United States of America
bmdubya1198

Re: Tried to use injector cleaner tool at the schrader valve

Post by bmdubya1198 » Sat Nov 09, 2019 4:38 pm

Also, you may have the regulator on the back left corner of the engine bay, just above the steering rack. Just follow the fuel line back.
That could possibly be an issue if your fuel pressure is low.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
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- Never should have sold it


Need used parts? PM me!

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