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Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHRough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Smoke-test before

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
Dave, I have never done a smoke test before but if your car was working properly before the test, there is a possibility that you unplugged (or cracked) one of the vacuum hoses and now you have a vacuum leak..?
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Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

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1 matching discussions · 5 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Smoke-test with a machine i bought online

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
Hey everyone, I’ve been trying to diagnose a P1126 recently, and I ran a smoke test with a machine I bought online.
Original post Read captured discussion
Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test there is a possibility

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
Dave, I have never done a smoke test before but if your car was working properly before the test, there is a possibility that you unplugged (or cracked) one of the vacuum hoses and now you have a vacuum leak..?
Original post Read captured discussion
Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (3)

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

Smoke-test before

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
Dave, I have never done a smoke test before but if your car was working properly before the test, there is a possibility that you unplugged (or cracked) one of the vacuum hoses and now you have a vacuum leak..?
Original post Read captured discussion
Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Smoke-test with a machine i bought online

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
Hey everyone, I’ve been trying to diagnose a P1126 recently, and I ran a smoke test with a machine I bought online.
Original post Read captured discussion
Rough idle after smoke test - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test there is a possibility

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
Dave, I have never done a smoke test before but if your car was working properly before the test, there is a possibility that you unplugged (or cracked) one of the vacuum hoses and now you have a vacuum leak..?
Original post Read captured discussion
Rough idle after smoke 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.

5 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 · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.

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

Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey everyone, I’ve been trying to diagnose a P1126 recently, and I ran a smoke test with a machine I bought online. I couldn’t spot any leaks or anything like that during the smoke test. After I completed the smoke test, I left the car in the garage overnight, and didn’t start it, to ensure any extra smoke left the engine before I started it. My biggest concern now, is that when I start it, it has an extremely rough idle. When I turn the car on, it runs normally for the first 3-5 seconds, then gets progressively worse. What can do I do from here? Everything I touched is back in place. 1998 986

POST 2Original post

unplug your maf. if it fixes itself then you got smoke goo on your maf and need to clean it.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 657065

Just tried this, it runs maybe a bit better, but still very low rpm at idle. One very weird thing: I was giving in a bit of gas to experiment, and heard a loud-ish sound from the engine bay. Turned off the car, then I turned it back on for just a few seconds. The rpms climbed a lot smoother when I gave it gas, but I didn’t experiment much because I dont know the source of the sound yet.

POST 4 / ORIGINAL POSTEROriginal post

Quotes source post: 657066

Does anyone have any info on this? I’m now getting high short term fuel trims, and when I drove it random misfire. P0300 P0304 P0305. What’s going on?

POST 5Original post

Dave, I have never done a smoke test before but if your car was working properly before the test, there is a possibility that you unplugged (or cracked) one of the vacuum hoses and now you have a vacuum leak..?

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