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S70 2.5t misfire

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

radek93
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Year and Model: S70 98
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radek93

Re: S70 2.5t misfire

Post by radek93 » Fri Feb 21, 2020 11:41 pm

wizechatmgr wrote: ↑
Sat Feb 15, 2020 10:13 am
radek93 wrote: ↑
Tue Feb 11, 2020 1:08 pm
I checked everything. It looks ok. Only after removing the ignition cap did I notice that the distributor's finger had a burn mark from a spark under a metal element, on plastic. As if the spark leaped at the very end.
Sounds like a carbon track. This could have caused intermittent or consistent misfiring. I used to have a hell of a time keeping the distributor cap in my old VW dry. Eventually I used dielectric grease around the seal and at all electrical connections.
I changed the finger of the distributor but it did nothing.

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wizechatmgr
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Year and Model: 1999 V70 XC AWD 2.4T
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wizechatmgr

Re: S70 2.5t misfire

Post by wizechatmgr » Sat Feb 22, 2020 8:40 am

radek93 wrote: ↑
Fri Feb 21, 2020 11:41 pm
wizechatmgr wrote: ↑
Sat Feb 15, 2020 10:13 am
radek93 wrote: ↑
Tue Feb 11, 2020 1:08 pm
I checked everything. It looks ok. Only after removing the ignition cap did I notice that the distributor's finger had a burn mark from a spark under a metal element, on plastic. As if the spark leaped at the very end.
Sounds like a carbon track. This could have caused intermittent or consistent misfiring. I used to have a hell of a time keeping the distributor cap in my old VW dry. Eventually I used dielectric grease around the seal and at all electrical connections.
I changed the finger of the distributor but it did nothing.
By chance did you verify the cap didn't have a track too? It doesn't take much. They can literally be microscopic. Also try spraying the engine with a mister bottle towards the distributor and coil. You'll see it arc if you're lucky.
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

radek93
Posts: 26
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home
Has thanked: 0
Been thanked: 0
Poland
radek93

Re: S70 2.5t misfire

Post by radek93 » Mon Feb 24, 2020 6:20 am

wizechatmgr wrote: ↑
Sat Feb 22, 2020 8:40 am
radek93 wrote: ↑
Fri Feb 21, 2020 11:41 pm
wizechatmgr wrote: ↑
Sat Feb 15, 2020 10:13 am


Sounds like a carbon track. This could have caused intermittent or consistent misfiring. I used to have a hell of a time keeping the distributor cap in my old VW dry. Eventually I used dielectric grease around the seal and at all electrical connections.
I changed the finger of the distributor but it did nothing.
By chance did you verify the cap didn't have a track too? It doesn't take much. They can literally be microscopic. Also try spraying the engine with a mister bottle towards the distributor and coil. You'll see it arc if you're lucky.
I will check. Why i have Ignition timing 9-11° when in datashets is 6+-2

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