9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFault Code P0300 - P0301
Leading reported evidence
Clean mass airflow metre
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Today fitted a new fuel filter still the same problem also took out and cleaned the Mass airflow metre and tested it and that was working OK but still the engine is on running rough and misfiring.
Leading evidence: 'Clean mass airflow metre' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean mass airflow metre' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
October 2020 new coils fitted (all six) still the same problem
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
In with Brookspeed at Eastleigh July 2019 where I had a new IMS kit fitted along with a Major service, new water pump and oil/air separator.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Hi, Replaced all six coils last month, yes from Design 911 still the issue
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Today fitted a new fuel filter still the same problem also took out and cleaned the Mass airflow metre and tested it and that was working OK but still the engine is on running rough and misfiring.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Clean mass airflow metre
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Today fitted a new fuel filter still the same problem also took out and cleaned the Mass airflow metre and tested it and that was working OK but still the engine is on running rough and misfiring.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
He carried out all the basic checks he could and when it came to cylinder 4 coil test, low and behold no electrical feed to the coil so he replaced the coil pack connector and she is now all OK
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
A few trips out after and all was good, I was following a car one day who slowed to turn off so I slowed behind once it was clear put my foot down and the light came on and she was really running bad.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
He carried out all the basic checks he could and when it came to cylinder 4 coil test, low and behold no electrical feed to the coil so he replaced the coil pack connector and she is now all OK
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Today fitted a new fuel filter still the same problem also took out and cleaned the Mass airflow metre and tested it and that was working OK but still the engine is on running rough and misfiring.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
I had a similar problem on my C4S and eventually opted for a remap which fixed it and also a slight flat spot...happy days !
Hi All,
I have a 2001 996 C4, the engine light came on whilst on a short journey and the engine sounded rough so I pulled over and switched off. After a few minutes I started her again and no engine light and she was running OK so took her home. A few trips out after and all was good, I was following a car one day who slowed to turn off so I slowed behind once it was clear put my foot down and the light came on and she was really running bad. I was not too far from home so finally got there. I had previously bought bought a FIXD "basic fault code reader" once I plugged it in the code P0300 came up, I looked that up to be a misfire.
Some car history:
In with Brookspeed at Eastleigh July 2019 where I had a new IMS kit fitted along with a Major service, new water pump and oil/air separator. so I do not expect it to be spark plugs causing the misfire.
October 2020 new coils fitted (all six) still the same problem
Today fitted a new fuel filter still the same problem also took out and cleaned the Mass airflow metre and tested it and that was working OK but still the engine is on running rough and misfiring.
After spending several hours looking on the Web know one seems to say any one solution. I've done the first and basic things in a logical order (I hope)
Can anyone please help with what else it could be. I live on the Isle of Wight so not easy to get to a Porsche garage.
Sounds like a coil pack? Cylinder 1 faulty, how old are they? Maybe replace them all from design 911
https://www.design911.co.uk/fu/prod13439/Ignition-Coil--PACK-OF-6--Porsche-996---986---987---996-GT3-MKII/
or similar.
Having replaced the spark plugs and coil packs, the only thing I can think of that would affect just one cylinder is the fuel injector on #1.
Here is the diagnostic sheet:
Download
Hi Richard,
Thanks for this, I will check our how to access the injectors and replace, this will be a job for my local mechanic "hopefully"
Regards
Neil
Hi All,
The fault finally put to bed. My local guy cleared the cylinder P0301 fault run the car again and this time it showed up as P0304 cylinder 4 misfire. He carried out all the basic checks he could and when it came to cylinder 4 coil test, low and behold no electrical feed to the coil so he replaced the coil pack connector and she is now all OK
Thank you all for your input.
