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Bogged at low rpm and idle surge goes away on restart?

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YOUR RESEARCHBogged at low rpm and idle surge goes away on restart?

Leading reported evidence

Check aos condition

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Performed · outcome unconfirmed · Original poster
I checked the AOS condition with a manometer about 5k miles ago and it gave an appropriate pressure, plus no smoke here.
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Bogged at low rpm and idle surge goes away on restart?

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

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Replace any parts

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Suggestion
Running well at speed and stalling at idle is classic vacuum leak symptom, so i would be going at that before changing any parts.
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Bogged at low rpm and idle surge goes away on restart?

Run issues until it doesn't

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Suggestion · Original poster
Usually that presents by not starting for you without giving it a bump before it fails completely, shouldn't present running issues until it doesn't run at all.
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Bogged at low rpm and idle surge goes away on restart?

Frequently discussed actions (3)

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Check aos condition

No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed · Original poster
I checked the AOS condition with a manometer about 5k miles ago and it gave an appropriate pressure, plus no smoke here.
Original post Read captured discussion
Bogged at low rpm and idle surge goes away on restart?

Replace any parts

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.

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Suggestion
Running well at speed and stalling at idle is classic vacuum leak symptom, so i would be going at that before changing any parts.
Original post Read captured discussion
Bogged at low rpm and idle surge goes away on restart?

Run issues until it doesn't

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
Usually that presents by not starting for you without giving it a bump before it fails completely, shouldn't present running issues until it doesn't run at all.
Original post Read captured discussion
Bogged at low rpm and idle surge goes away on restart?

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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.

5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

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Outcome without a verified action link
I shut it off, turned it back on, problem solved.
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Generation: 20261026T190023Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

2002 C2. I had been driving around and was driving home. Made a turn in the neighborhood, upshifted to 2nd and it bogged, bogged enough that I thought I had gone into 4th by mistake but wasn't. Downshifted to 1st figuring I would limp the last bit home given no odd noises or smokes, and noted there that below 2500rpm the engine bogged and surged. Parked in my driveway and after a couple of seconds the idle started surging. I shut it off, turned it back on, problem solved. Any ideas? I have a durametric but I don't think there will be any codes. I checked the AOS condition with a manometer about 5k miles ago and it gave an appropriate pressure, plus no smoke here. The Loss Adaption at Idle is around 1.2%, but I don't have a frame of reference. And I confirmed there is no code.

POST 2Original post

Fuel pump on it's way out? Been a few reports lately.

POST 3 / ORIGINAL POSTEROriginal post

I don't think so. Usually that presents by not starting for you without giving it a bump before it fails completely, shouldn't present running issues until it doesn't run at all. Given that it was only surging in the lower rpm range, I wonder if there is a sensor for the variocam that can fail.

POST 4Original post

Running well at speed and stalling at idle is classic vacuum leak symptom, so i would be going at that before changing any parts. The heat can open up a leak that will not show when cold. Simple test is vacuum gauge, if that is showing lower than expected at hot idle then smoke test

POST 5 / ORIGINAL POSTEROriginal post

I don't think there's a leak. I didn't give it any time between the shut down and start up, I just shut it off and immediately restarted and it was fine. Also it hasn't done it again since. It had done it once before though, months earlier. I think it's electrical, but I don't know how what electrical parts are involved.

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