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No power after braking Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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erikv11
Posts: 11800
Joined: 25 July 2009
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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Re: No power after braking

Post by erikv11 »

Semi truck trailer? Forklift? :D
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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Sommerfeldt
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Year and Model: 2018 S90 T8
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Post by Sommerfeldt »

:D :D :D
No matter what, cleaning stuff is always a good idea. :)

- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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Cammer
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Year and Model: 1996 Volvo 850
Location: Vancouver
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Post by Cammer »

Problem solved! I replaced all the vacuum hoses and fittings (some quite brittle). Problem persisted. I vacuum tested the MAP sensor -ok. Heat tested the Intake Air Temperature sensor - ok. I went back to the fuel system again (had already replaced the filter and checked pressure at the rail. Began with the pump - couldn’t hear it. I jumpered and bypassed the pump relay. Could hear the pump functioning! Replaced the old intermittent relay with one from inventory - the car is running like a champ. Thank you all for sharing your experience and expertise in helping me get back on the road!
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WhatAmIDoing
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Year and Model: 1998 S/V70 T5M
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Post by WhatAmIDoing »

Cammer wrote: ↑02 Nov 2018, 14:32 Problem solved! I replaced all the vacuum hoses and fittings (some quite brittle). Problem persisted. I vacuum tested the MAP sensor -ok. Heat tested the Intake Air Temperature sensor - ok. I went back to the fuel system again (had already replaced the filter and checked pressure at the rail. Began with the pump - couldn’t hear it. I jumpered and bypassed the pump relay. Could hear the pump functioning! Replaced the old intermittent relay with one from inventory - the car is running like a champ. Thank you all for sharing your experience and expertise in helping me get back on the road!
Those pesky fuel pump relays will get you. Always test the relay before you start tearing things apart and replacing things. I learned that the hard way.
'98 S70 T5M - 323,000mi - awaiting heart transplant :shock:
'98 V70 T5M - 324,000mi - my new project
'99 S70 "AWD" - 220,000+mi - gone :cry:
Knows enough to be dangerous :wink:
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erikv11
Posts: 11800
Joined: 25 July 2009
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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Been thanked: 765 times

Post by erikv11 »

Eh, totally worth it to replace all of the brittle vacuum lines, no harm done there. Otherwise he just tested things, smart moves all.

Cammer, glad you solved it! I had a fuel pump relay die on me this morning, too ...
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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