10 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoils or MAF? or both?
Reported or suspected cause
broken connection
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
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause · Original poster
The problem was a broken connection on the vacuum controller for the flap inside the plenum.
Leading evidence: 'broken connection' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'broken connection' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check oil + coolant level' (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 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
I know the MAF was pulled out and cleaned at the last service which under 500km driving before the problem appeared, so probably the 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 contain suggestions
1
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Suggestion
Just make sure there is no knocking as in bearing slop before going, and check oil + coolant level.
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
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Suggestion
One potentially misleading issue with static resistance testing: Coils often test fine on the bench, but then break down electrically under hot load conditions.
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
There is a simple test for the coils to see if they are good or not.
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
One potentially misleading issue with static resistance testing: Coils often test fine on the bench, but then break down electrically under hot load conditions.
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 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.
Hi all Just wanted to see what the collective wisdom thinks this is likely to be. Only started doing it this morning. It shakes the whole car as it stumbles. Started throwing codes, but I don't have a reader at the moment.
Thoughts? My best guess is coils. Please excuse the potato I have for a phone....
Coils test.
There is a simple test for the coils to see if they are good or not. All you need is an ohm meter:
Resistance between terminal 1 and terminal 15 at 20°C: 0.3 - 0.7 ohms. Anything outside of this range is suspect.
Likewise on the spark plug connectors: Resistance: approx. 2 k ohms
One potentially misleading issue with static resistance testing: Coils often test fine on the bench, but then break down electrically under hot load conditions. So if the unit is suspect, test it on the bench, but then swap it with a another coil pack from the engine that is working correctly and see if the misfire moves to that cylinder. If it does, the coil pack is toast.
I had to move the car out of the shed this morning. Cold start sounded terrible. Instant Check engine light, idle was over 2000rpm and it just sounded terrible. I really need to get a code reader...
How close is your independent Porsche specialist, they will only take a few minutes to diagnose with a reader. Also if in Vic, call Dave Brennan of 9XX Mechanical, formerly Nurburgring mechanical. He’s mobile and can diagnose as is a Porsche specialist.
Cheers tomo, Dave has been known to travel to country Vic and NSW. Would prob ask just to see.
Gnrnr, what i used to do in your situation was give the car an Italian tune up. Take it for a spirited drive and get up to redline.
Just make sure there is no knocking as in bearing slop before going, and check oil + coolant level.
250km away in Melbourne somewhere......
Yeah oil and coolant is fine. I am going to ring a local mechanic and just get the thing scanned. Just haven't got around to making the call yet.
I know the MAF was pulled out and cleaned at the last service which under 500km driving before the problem appeared, so probably the MAF. If the car sits idling for a bit it gets worse and doesn't clear with throttle. Found that out last week after I fitted up the new coils (I'd been wanting to do those anyway so no biggie).
speaking of which there is a fun day on the 22nd if anyone is interested. I'll be there with my sons RX-8 helping him out. <Mine looks like it will be staying in the shed.
And we have an answer. The problem was a broken connection on the vacuum controller for the flap inside the plenum. New plenum assembly and all is now good. Only took 6 months....
😭
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