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98 S70 all cylinders misfiring, rough idle

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: 98 S70 all cylinders misfiring, rough idle

Post by E Showell »

I thought I read "Denso wires." The collective wisdom on this board seems to be Bougicord wires only -- others will tend to give problems. Using other than OEM ignition components on these cars can give problems.
'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)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT

User avatar
rgcustom
Posts: 10
Joined: 30 December 2012
Year and Model: S70 GLT, 1998
Location: Virginia

Post by rgcustom »

Ok, so new wires are added to the mix. And what is the best method of cleaning the cam sensor without damaging it. Should I use MAF cleaner or carb cleaner or something completely different? Thank you everyone again for your help and support.

User avatar
rgcustom
Posts: 10
Joined: 30 December 2012
Year and Model: S70 GLT, 1998
Location: Virginia

Post by rgcustom »

So the misfire was caused by the cam seal behind the distributor. Cap was full of oil and cam seal peices. All replaced plus new plugs and coil. Now off to replace PCV. Dipstick tube IS smoking. Thanks for everybody's help.

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