19 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFirst post, and not a happy one
Reported or suspected cause
ignition coils
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Reported cause
The only intermittent down-on-power issue I've experienced with either M96-powered car I've owned (other than short-term timing retardation courtesy of PSM) was caused by failing coil packs.
Leading evidence: 'ignition coils' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'ignition coils' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace crank position sensor and all is right' (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
Replaced crank position sensor and all is right with the car again.
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 suspect a cause
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.
Suspected cause · Original poster
When attempting to replicate the power loss today, and hopefully get a code or light to throw, the issue is gone.This has us leaning towards a failing MAF.
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 suspect a cause
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.
Suspected cause · Original poster
So after determining it was not the MAF, and that the issue was intermittent with no indicators as to when or why it would happen, I kept driving until finally the CEL came on and a code was thrown - P0335 for crankshaft position sensor.
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 contain suggestions
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.
Suggestion
I, too, �had� to test full power on my car after a recent fix to make sure the cams were working properly above 5900-7000+ with smiles while doing it
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
ignition coils
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.
Reported cause
The only intermittent down-on-power issue I've experienced with either M96-powered car I've owned (other than short-term timing retardation courtesy of PSM) was caused by failing coil packs.
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.
Suspected cause · Original poster
When attempting to replicate the power loss today, and hopefully get a code or light to throw, the issue is gone.This has us leaning towards a failing MAF.
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.
Suspected cause · Original poster
So after determining it was not the MAF, and that the issue was intermittent with no indicators as to when or why it would happen, I kept driving until finally the CEL came on and a code was thrown - P0335 for crankshaft position sensor.
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.
19 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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.
So last August I purchased my first Porsche, a 2002 Cab with 59K on it. I had it freshly serviced to include new belt, WP, and upgraded IMS among a number of lesser items. It�s been a great car and I�ve been loving it for the last 4K miles I�ve put on myself.
Today when taking it out, I�m experiencing a loss of power when I hit 4,500 rpm. Can�t get any higher. This seems to be happening in all gears. At lower rpm it seems fine. No strange noises, smells, or leaks. No misfires. No lights on dash. I�m left scratching my head.
I�m most likely taking it to my mechanic tomorrow. My big questions are (1) has anyone experienced a similar issue and (2) do you think it�s ok to drive to him or should I have it trailered?
Thanks in advance.
An update:
Spoke to the mechanic. There are no lights, faults, or codes showing. Did some investigating, found no obvious issues.
Air filter is clean and pristine.
During the investigation yesterday, the engine could rev to 5k just fine when not in gear.
When attempting to replicate the power loss today, and hopefully get a code or light to throw, the issue is gone.This has us leaning towards a failing MAF. As far as anyone knows it�s original to the car and has never been cleaned.
More info as it comes...
Another thing it could be is a failing catalytic converter. Once the honeycomb starts breaking down, it clogs the air flow path and it works correctly at low load (low airflow) but cannot breath at high load (high airflow). I've seen it many times on other cars, but I have never heard it reported here.
A clogged catalytic converter seems unlikely to present as an intermittent issue.
I'm gonna go with one or more cracked coil packs.
The only intermittent down-on-power issue I've experienced with either M96-powered car I've owned (other than short-term timing retardation courtesy of PSM) was caused by failing coil packs.
So after determining it was not the MAF, and that the issue was intermittent with no indicators as to when or why it would happen, I kept driving until finally the CEL came on and a code was thrown - P0335 for crankshaft position sensor.
After this, the problem started to present when the car was fully up to temp after extended driving.
Replaced crank position sensor and all is right with the car again.
OP,
Thank you for the update. The resolution of your issue adds more to this forum’s diagnostic data. So now CPS can be added to our troubleshooting checklist.
Awesome. You have been testing for full power above 4500 RPM, right? I, too, �had� to test full power on my car after a recent fix to make sure the cams were working properly above 5900-7000+ with smiles while doing it
If things are good on your car, it should only take about an hour. It�s a really simple and straight forward replacement. Almost sounds impossible for a Porsche.
Mine was not good. The head of the bolt was stripped. There was corrosion between the bolt and the sensor, and between the sensor and block. So all in, 4 hours of shop time.
This is a source reference. Confirm exact model applicability in the original material.
