Rennlist

"Ghost in the Machine?" 99 996 Idle Issues

Add to repair workspace

New repair projectOpen repair workspace

Original source

4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH"Ghost in the Machine?" 99 996 Idle Issues

Leading reported evidence

Clean about a month ago

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
Throttle Body was clean about a month ago.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Read full discussion summary

Leading evidence: 'Clean about a month ago' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean about a month ago' (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.

Read captured replies

1 matching discussions · 4 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Clean idle control valve (icv)

Suggestion or failed attempt

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
You need to check and clean your Idle Control Valve (ICV) which is located on the left side of the throttle body.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Replace oil filler cap, dip stick

Suggestion or failed attempt

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
All I did between starts was tighten gas cap, remove and replace oil filler cap, dip stick.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Tighten gas cap, remove

Suggestion or failed attempt

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
All I did between starts was tighten gas cap, remove and replace oil filler cap, dip stick.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Clean about a month ago

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
Throttle Body was clean about a month ago.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Clean idle control valve (icv)

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
You need to check and clean your Idle Control Valve (ICV) which is located on the left side of the throttle body.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Replace oil filler cap, dip stick

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
All I did between starts was tighten gas cap, remove and replace oil filler cap, dip stick.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

Tighten gas cap, remove

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
All I did between starts was tighten gas cap, remove and replace oil filler cap, dip stick.
Original post Read captured discussion
"Ghost in the Machine?" 99 996 Idle Issues

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.

4 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.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Went to start my 1999 996 C2Cab (cable throttle) after it being garaged for about 5 days and it spikes at 3k RPM! YIKES! Runs a while at that and then drops down to 2K, then decides on it's own (like Christine) to rev from 1K to 2K over and over again for about a minute or so (no error lights or CEL) then suddenly it drops down once warmed up to it's normal smooth idle which is like 8 then settles down a bit further on the road.. Drove it and the car was really responsive, later starts all fine. Again no error lights. Tried code reader but seemed to be fine. All I did between starts was tighten gas cap, remove and replace oil filler cap, dip stick. Looked at hoses and clamps, connections for MAF,. Throttle Body was clean about a month ago. Researched this a ton but did not find this exact random issue, welcome input from the vets here. Any thoughts from the community? It seems to be fine now. Drove it all afternoon. Generally the compartment is tidy, 997 intake. Plenum clamps look ok. Peak rev on startup.... Standing idle aftermath...

POST 2Original post

Interesting. Mine is an '02 C2 Cab and frequently sits for 2-3weeks between starts. It has never done this. Maybe specific to the cable throttle cars, or the .1 cars. Or something is wrong with my car. It sounds like it's running well. Maybe a point of interest instead of worry.

POST 3Original post

You need to check and clean your Idle Control Valve (ICV) which is located on the left side of the throttle body. They get gummed up and cause erratic idle. Do a search on this forum, there are plenty of threads on how to do this.

POST 4 / ORIGINAL POSTEROriginal post

On it. thanks.

This is a source reference. Confirm exact model applicability in the original material.