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2002 C70 floods occasionally on 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

dobrosailor
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Year and Model: 2002 Vovlo C70
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dobrosailor

2002 C70 floods occasionally on start

Post by dobrosailor » Thu May 02, 2019 8:22 am

Nice C70 runs great BUT occasionally it will flood on startup and die if I don’t rev it to clear it out. When it absolutely won’t start, if I disconnect the battery and turn the key to start it then reconnect the bat, starts right up. Recent Volvo plugs. 150k.

Thoughts?



dobrosailor
Posts: 22
Joined: Sun Dec 02, 2018 8:01 am
Year and Model: 2002 Vovlo C70
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dobrosailor

Re: 2002 C70 floods occasionally on start

Post by dobrosailor » Thu May 02, 2019 4:37 pm

Few more details, It will throw a pending code of p300 or something like that. Bottom line is its all cylinders missing, not one, so not stuck injector. If it doesn’t happen soon after depending goes away. But other times if it happens a couple times in a row and locks down in an engine code. I’m curious if these cars run in an open loop, and what sort of inputs are used in the open loop that might corrupt the starting mixture.



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WhatAmIDoing
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Year and Model: 1998 S70 T5M
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WhatAmIDoing

Re: 2002 C70 floods occasionally on start

Post by WhatAmIDoing » Thu May 02, 2019 5:00 pm

No need to disconnect the battery. Just floor the gas and that should shut off the injectors. Flooding at startup is usually a bad electronic coolant temp sensor.


'98 S70 T5M - 270,000+mi - forever a project
'99 S70 "AWD" - 218,000+mi - project
Knows enough to be dangerous :wink:

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