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850 won't start unless gas pedal is pressed while cranking

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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E Showell
Posts: 3275
Joined: 16 October 2008
Year and Model: ‘07 S80 3.2
Location: Long Valley, N.J.
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Re: 850 won't start unless gas pedal is pressed while cranking

Post by E Showell »

Sounds like a classic failed engine coolant temperature sensor. The car thinks its very cold so it dumps extra fuel in to enrich the mixture for starting. The only way to clear to extra fuel is to depress the gas pedal -- sounds counterintuitive I know, but it isn't. If you change the ECT, then also change the thermostat.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
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'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
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dubsetter
Posts: 34
Joined: 9 March 2016
Year and Model: 1996 850
Location: WV

Post by dubsetter »

Thanks for the advice, I will continue to investigate. I still suspect it to be the fuel injector relay. The clip on mine was broken off and it was floating around which probably made it come loose over time. I going to clean out the MAF when I get chance as well as check the CPS.
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