10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Clean tb and icv
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.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Clean tb and icv' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check valve tomorrow' (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.
Clean the whole engine has just been freshly put together
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
Intake plenums and throttle housing are cleaned, the whole engine has just been freshly put together.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use wood screw and a plier
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
There`s a copper/brass pin that has to be pulled out, I used a wood screw and a plier to grab it.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check valve tomorrow
Suggestion or failed attempt
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 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.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect too long
Suggestion or failed attempt
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 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 · Original poster
Emission is fine, I was told the reader could not reveal the fault code history because the battery was disconnected for too long, for 13 years actually.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect too long
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster
Emission is fine, I was told the reader could not reveal the fault code history because the battery was disconnected for too long, for 13 years actually.
P0506 Idle Air Ctrl Sys and Failed smog test - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
2 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Update: I fixed the code issue, it was indeed the IAC valve, thanks for the suggestion.
Dear All,
I hooked up my code reader which revealed the following code: P0506, idle air control system failure. The engine has a stable idle when cold, ~800, when it warms up it goes a bit over 1000 and fluctuates between ~1100-1200. I`ll look into this tomorrow but I thought I ask the Community first if there`s anything obvious to look at with these symptoms. Intake plenums and throttle housing are cleaned, the whole engine has just been freshly put together.
Not sure if related, but the car failed the smog test yesterday. Emission is fine, I was told the reader could not reveal the fault code history because the battery was disconnected for too long, for 13 years actually. So I was told to put a couple hundred miles into the car and go back and it would pass...
Thanks for any insight.
Thanks, JFP, for the quick response. I`ll check the valve tomorrow. I also noticed that when I operate the throttle and the engine is revving the intake plenums get a bit "inflated" like some "lungs". Is that normal? I would expect the opposite..
Update: I fixed the code issue, it was indeed the IAC valve, thanks for the suggestion. It wasn`t really dirty, but I think it was stuck. I disassembled and cleaned it out and now idling is stable and the code s gone.
I made a video of the intakes expanding, uploaded it here:
https://www.youtube.com/watch?v=8C2ZBcO4WZY&feature=youtu.be
Perhaps the new rings need to wear in and not seating perfectly yet..
My 98 "breathes" exactly as yours does. At first I was concerned until I realized what is happening. With throttle closed and max vacuum in intake plenums, everything is drawn together. When the throttle is opened intake manifold vacuum drops and the intake manifolds relax appearing to expand. I may be wrong.
It`s a super simple 30 mins job. I didn`t remove the throttle body but I knew it was clean. Just pulled the AOS-to-throttle body hose off, removed the two torx screws and the connector and pulled the valve off. Be sure you don`t damage the paper gasket if you don`t have a new one. For cleaning it`s not necessary to disassemble the valve unit but it`s easier to inspect and clean the parts if you do so. There`s a copper/brass pin that has to be pulled out, I used a wood screw and a plier to grab it. Then you just need to twist the two halves against each other to unlock the bayonet lock and they come apart. There was a little dirt and dust in the valve unit and also around the magnet that made it stuck. I dropped both into a jar with gasoline, shaked for a minute then dried them with compressed air and reassembled.
Dealing with the same issue. I cleaned my TB and ICV with cleaner. The idle issues persisted, then I went through 4 aftermarket ones, one of which wasn't too bad but the rest either didn't fit or wouldn't run. I finally got fed up and put the original Bosch unit in after fill/drain with rubbing alcohol then seafoam. Still having the same symptoms. Would opening it up and cleaning it do the truck, or should I get another new one?
This is a source reference. Confirm exact model applicability in the original material.
