08-17-2011, 02:56 PM
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#1
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Registered User
Join Date: Aug 2011
Location: california
Posts: 111
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need help diagnosing codes, p0300 etc
hello, i could use some help. i just pulled the following codes p0300, p301, 302, 304, 305. i know this means random misfire, whats my next step?
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08-18-2011, 07:22 PM
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#2
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Registered User
Join Date: Feb 2011
Location: St Paul, MN
Posts: 59
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Symptons?
What were the symptoms leading up to the CEL?
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08-19-2011, 04:25 PM
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#3
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Registered User
Join Date: Aug 2011
Location: california
Posts: 111
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just bought the car last week so i don't know the symptoms leading up to it. i only realized when driving above 5,200rpm(cel light flashes) so far i've checked for a vacuum leak, cleaned MAF and switched the coils around but still the same codes. i'm going to try changing out the sparks plugs and go from there, any suggestions please?
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08-20-2011, 04:29 AM
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#4
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Quote:
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Originally Posted by juicepro
hello, i could use some help. i just pulled the following codes p0300, p301, 302, 304, 305. i know this means random misfire, whats my next step?
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You may find this link valuable .
http://boxster.wikia.com/wiki/CEL_Error_Codes
__________________
Don't worry … I've got the microfilm.
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08-20-2011, 02:37 PM
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#5
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Registered User
Join Date: Feb 2011
Location: St Paul, MN
Posts: 59
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If the faults are only at higher RPMs, I'd guess the misfires have to do with valves/valve timing. But, others on the forum may have a better idea.
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08-20-2011, 05:48 PM
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#6
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Registered User
Join Date: Aug 2011
Location: california
Posts: 111
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it doesn't look like this car has been serviced for a few years, i've ordered an air filter and plugs we'll see if that changes anything. thanks
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08-21-2011, 06:37 AM
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#7
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Porsche "Purist"
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
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Are you "feeling" the misfires?
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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08-21-2011, 03:06 PM
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#8
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Registered User
Join Date: Aug 2011
Location: california
Posts: 111
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"Are you "feeling" the misfires?"
No, the car seems to feel and drive fine, but i only just got it last week so it's hard for me to have a baseline "feel" for this car.
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08-21-2011, 03:41 PM
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#9
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Porsche "Purist"
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
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I agree, let's see what new plugs do.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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