Rennlist

Misfire on cold starts

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHMisfire on cold starts

Leading reported evidence

Clean air filter and the maf tomorrow (car came

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
based on the other posts I am going to clean my air filter and the MAF tomorrow (car came with Fabspeed air intake, which I am thinking to remove and go back with the stock).
Original post Read captured discussion
Misfire on cold starts

Read full discussion summary

Leading evidence: 'Clean air filter and the maf tomorrow (car came' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean air filter and the maf tomorrow (car came' (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 · 3 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Clean maf is a good idea

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
Properly cleaning the MAF is a good idea.
Original post Read captured discussion
Misfire on cold starts

Use proper cleaner

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
Use the proper cleaner for the MAF and TB!
Original post Read captured discussion
Misfire on cold starts

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.

Clean air filter and the maf tomorrow (car came

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
based on the other posts I am going to clean my air filter and the MAF tomorrow (car came with Fabspeed air intake, which I am thinking to remove and go back with the stock).
Original post Read captured discussion
Misfire on cold starts

Clean maf is a good idea

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
Properly cleaning the MAF is a good idea.
Original post Read captured discussion
Misfire on cold starts

Use proper cleaner

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
Use the proper cleaner for the MAF and TB!
Original post Read captured discussion
Misfire on cold starts

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.

3 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: 20261026T213932Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi All, My 2004 996 4S is always having some misfire on cold starts, will last for 30 seconds then everything is fine and I don't experience any. Always happens in the morning when I start it to go to work (100 miles everyday round trip). It is my DD and I just had the IMS, RMS changed 5000 miles ago, had new coils and new spark plugs installed at the same time thinking that would fix the issue, but didn't. What could it be? based on the other posts I am going to clean my air filter and the MAF tomorrow (car came with Fabspeed air intake, which I am thinking to remove and go back with the stock). Any other things I should look for? Don't have any durametric for error codes to give more details... sorry. Thanks for the help!

POST 2Original post

I have the Fabspeed intake and don't have any misfire problems. But if it were me, I'd go back to stock and see if that helps. If you have all the parts, it is a cheap and easy test. Properly cleaning the MAF is a good idea. Also I would take a look at your throttle body and make sure it is clean. Use the proper cleaner for the MAF and TB! With it only misfiring at cold start, I would suspect something that could be affected by heat. Check that your rubber/silicone intake boot is tight. If it is leaking when cold, but then expanding when warm it could possibly cause the same issue. Also, go pick up a cheap OBDII scanner and grab any codes. I've seen cheap ones for under $30. While it isn't a Durametric/Snap-On/Autel/etc, it is better than nothing!

POST 3Original post

Vacuum leak?

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