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

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

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E Showell
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E Showell

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

Post by E Showell » Sat Jun 25, 2016 5:47 pm

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 (actively for sale)
'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
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)

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

Post by dubsetter » Sun Jun 26, 2016 7:48 am

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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