11 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCrazy idle issue, '99 c2
Leading reported evidence
Check binding, junction box
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
3) Throttle Cables cleaned, checked for binding, junction box cleaned
Leading evidence: 'Check binding, junction box' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check binding, junction box' (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.
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
1) Air idle valve, replaced after finding crack in original
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
5) Smoke tested for vacuum leaks, found two and repaired.
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.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
6SpeedOnline: 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My '99 c2 has an issue that is driving me nuts. When driving, the idle of the car does not drop below 2300 rpm unless I leave it in gear and brake down to 1000 rpm or so, and then it will idle normally. As soon as I get back up over 2300, it not drop below that level, even between shifts. Problem seems worse when the engine is warm. Here is what has already been eliminated from the list of possible causes.
1) Air idle valve, replaced after finding crack in original
2) Mass air flow sensor - came up on CEL readout, so i replaced
3) Throttle Cables cleaned, checked for binding, junction box cleaned
4) Throttle body cleaned, spring checked
5) Smoke tested for vacuum leaks, found two and repaired.
6) Throttle pedal disassembled, cleaned and lightly lubed
7) Manometer reading at oil filler checked
None of the above has made a difference, if anything, it has gotten worse. I have posted quite a few threads at Rennlist, and I need to spread the net a bit wider to see if i can get lucky and catch the solution here! Several Rennlisters with the same year car also have the same problem. Eternally grateful to the sage who solves it!
I had similar issue and it was a leak at the throttle body. maybe go back through a few of the things you already tried as those would be where I think most of us would have focused as well.
When you say the car drives beautifully .... does that mean the parking sensors and seat positioning motors etc all work and you detect no faults what so ever despite the codes suggesting otherwise?.....AND all those bulbs work , they are not out !
2- state of the LHS battery ? .....voltage and if its been left without a trickle charger .....if so a voltage drop = throws codes like confetti at a wedding .
Quote:
hi John when I say I'd drives perfectly I mean that it goes like a methhead on a motorbike!! Pulls like a train. But that's not to say it's full boost.as for the other things the lights rear numberplate is a loose wire the courtesy like is a snapped wire .the seats threw up that code after i unplugged them but won't disappear but seems all work. The batteries are brand new correct AGM and lead acid on the starter.the only things I've not looked at are the boost. Control and the HVAC motor any help greatly received
Its been another few years since. Did either of you manage to resolve this error? My car comes up with the same error but drives fine. Would like to clear it if possible.
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