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Code P0302 cyl #2 misfire & Code P0300 Multiple cyl misf

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

Code P0302 cyl #2 misfire & Code P0300 Multiple cyl misf

Postby S70 Guy » 28 Nov 2005, 18:15

Just purchased 98 S70 GLT 145K on it. Had check engine lite on. After replacing a few items the CE would come and go. It was off so I was feeling lucky and went to the E-Check.

Put in before E-Check;
New Battery
Bosh plugs, Wires, Distrib cap and rotor
Replaced air and cabin filter
Bosh fuel filter
Ran a few tanks of 93 octane gas and fuel injector cleaner (pop & pour)

Drove it on highway for 20min
Took it for emisions test and failed.
Gas cap pressure good
Code P0302 cylinder #2 misfire detected
Code P0300 random/multiple cylinder misfire detected

What else could cause misfires like that? Ignition coil ?
Is there a code list somewhere on here?

Thanks in advance.
1998 S70 GLT 145K

1993 850 GLT 172K
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Postby White850Turbo » 29 Nov 2005, 14:35

It's the crappy Bosch plug wires; they all do that. Replace them with OEM Bougicord and you should be fine.
-Sean

1995 850 Turbo (Extensively Modded)

1998 S70 T5 (Almost Stock)
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Postby bigmuse » 17 Aug 2006, 19:57

I am having a similar problem. I'm getting an ODBII P0302 code on my car(listed in my sig). I replaced plugs, wires, cords, dist. cap and rotor all about a month ago. Just yesterday my check engine light came on with the P0302. The replacement parts I used are all listed in my sig as well. The plugs were supposedly pre-gapped to the correct specification. Should I try replacing the brand new plug wires as a previous poster mentioned or try something else. How do I tell if the spark plugs are funtioning properly? Shouldn't the bottom of them be gray-ish colored after a couple months use? Will a misfiring cylinder hurt anything? I haven't noticed any difference in performance or anything else. It is idling very smoothly and doesn't appear to be knocking. Please help!!! Thanks.
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Postby the underlord » 17 Aug 2006, 21:14

don't use platinum plugs..

just go get OEM plugs... that'll fix your problem.
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Postby bigmuse » 17 Aug 2006, 22:12

thanks, anything else i should check for when i pull the plugs out? are the platinum +4's just bad plugs or my engine doesn't like em?
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Posts: 13
Joined: 17 Aug 2006, 19:24

Postby pfeener » 17 Aug 2006, 22:12

+1 on everything that's been said. Stick with the genuine Volvo plugs and wires. Get the parts from FCPgroton. They have the Volvo plugs and the Bougicord wires are exactly what you would get if you walked into the dealer and pluncked down the big bucks. (and I mean exactly, right down to the stenciling and the Volvo brand name)
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Postby bigmuse » 17 Aug 2006, 22:24

is there a plug i can get locally at autozone that will be similar to the stock volvo plugs? i'm not having any kind of black exhaust or anything and my car seems to be running better than ever so i dunno. it's an N/A car also, which i have read that the turbos have problems with the platinum plugs. thanks again for the advice guys.
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Posts: 13
Joined: 17 Aug 2006, 19:24

Postby bigmuse » 17 Aug 2006, 22:27

how would i test the wires to see if they are operating to specification? voltmeter?
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
New Member
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Posts: 13
Joined: 17 Aug 2006, 19:24

Postby bigmuse » 18 Aug 2006, 01:25

i picked up some ngk v-power. puh-puh-puh-puhlease help me with the other stuff.
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Posts: 13
Joined: 17 Aug 2006, 19:24

Postby MadeInJapan » 18 Aug 2006, 03:51

People here have told you what to get and you go and get something else. What do you expect? The Volvo engines are finicky and don't like certain kinds of plugs. If you can't get the Volvo plugs for some reason, then you can use Bosch Copper plugs FR7DC. In fact, with an N/A engine, that's what I would recommend anyway. Bougicord wires (www.fcpgroton.com is your friend) too.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
94 850 Sedan NA Drk Blue/Tan
'00 V40 Purple/Grey Mobil-1
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Location: Knoxville, TN American but born in Japan
Model and Year: '98 S70 T5

Postby bigmuse » 18 Aug 2006, 19:49

well, i have to drive my car a lot so i was looking for something that i could get yesterday locally and put in the same day. i was also told on another message board that the ngk's work great with these cars, so that's what i got since i can get it locally and cheap too(1/3 the price of the platinum +4's that i'm now selling to a friend). bosch wires are what was in my car before i got it and never had any problems with them in the 20,000+ miles that i used them, so i'll save my hundred dollars on the wires until they cause issues. everything seems fine so far with the ngk's, but then again, everything was fine with the plat4's for over a month. the plugs seem to be have been doing a good job with a slight grey tint to the tip and no signs of a lean or rich condition. i can't tell any difference in performance or smoothness of idle with the ngk's vs. the plat4's. my car may just not like the premium fuel + FIC that i've been using lately. anyways, so how would i test the wires to see if they are operating to specification? i really do appreciate the help and am not trying to go against your wishes, just wanted to get something locally so that i could drive my car without worrying.
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Posts: 13
Joined: 17 Aug 2006, 19:24

P0300, P0303, P0304

Postby GT8888 » 17 Oct 2006, 07:07

Dear Bigmuse

Did you fix your problem, I have a similar problem as you have and did exactly what you have done. Replaced parts as follows:

Bosch spark plugs purchased from the Volvo Dealer
Cap and Rotor Purchase from the Volvo Dealer
Bosch Ignition wires purchased from Lordco our largest local auto parts supplier

Looking forward for your reply.
GT8888
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Postby bigmuse » 17 Oct 2006, 20:59

changed the plugs again and tested the wires, all ended up with the same problem. ended up just not worrying about it for a while and then i got one of the high dollar fuel system treatments. i had been using the little 2 dollar FIC and fuel treatments. got one of the complete fuel system treatments that are about $15 and it cleared everything up. cleared up occasional rough idle as well as the check engine problem... apparently had a partially clogged injector. hope this helps... the bosch wires are fine, but they have been known to separate near the boot easily.
1998 Volvo S70 B5254FS 93k miles



Recently Replaced Parts:

Yokohama Avid H4S Tires

Bosch Platinum +4 Plugs

Bosch Plug Wires

Bosch Distributor Cap/Rotor

Bosch Front O2 Sensor

Front Engine Mount
bigmuse
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Posts: 13
Joined: 17 Aug 2006, 19:24

Postby bigmuse » 17 Oct 2006, 21:00

you are having multiple misfires so i doubt yours is because of a clogged injector though unless you got some dirty gas and had it clog a few
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