986Forum

top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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 RESEARCHtop end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Reported or suspected cause

cracked 1-3 head

Reported cause

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

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 report identifying a cause: 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.

Reported cause · Original poster
It turned out to be a cracked 1-3 head.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Repair crack

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
and they repaired the crack, replaced the valve springs, reground the valves, and did a stage 1 porting.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'cracked 1-3 head' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'cracked 1-3 head' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Repair crack' (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 2 other evidence results

Repair crack

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
and they repaired the crack, replaced the valve springs, reground the valves, and did a stage 1 porting.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

4-pintle type

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 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.

Suspected cause · Original poster
Fortunately, the injectors turned out to be the 4-pintle type, which I thought were not used until after 2005.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.

Frequently discussed actions (1)

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

Repair crack

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
and they repaired the crack, replaced the valve springs, reground the valves, and did a stage 1 porting.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Reported and suspected causes (2)

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

cracked 1-3 head

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that report identifying a cause: 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.

Reported cause · Original poster
It turned out to be a cracked 1-3 head.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

4-pintle type

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 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.

Suspected cause · Original poster
Fortunately, the injectors turned out to be the 4-pintle type, which I thought were not used until after 2005.
Original post Read captured discussion
top end rebuild on 996 3.4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.

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.

986Forum: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 1 adjusted by outcome qualification.

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

Generation: 20261027T044418Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Back in May I suffered the dreaded intermix in my 99 Carrera 4. It turned out to be a cracked 1-3 head. The crack was around the center plug housing. I sent the heads to Hoffman Automotive and they repaired the crack, replaced the valve springs, reground the valves, and did a stage 1 porting. The heads look great! I've also had the lifters rebuilt and the fuel injectors refurbished. Fortunately, the injectors turned out to be the 4-pintle type, which I thought were not used until after 2005. I'll use this thread to update progress on getting things back together and the final results. It may take until spring 2017, as there are a number of other things to take care of with both engine and car. For now, some engine porn:

POST 2Original post

Oh so nice! Good to see that you're getting it back together!

POST 3Original post

Nice pictures! JFro, did you disassemble the engine as well? Or removed the heads and left the engine on the car?

POST 4 / ORIGINAL POSTEROriginal post

The engine is out of the car, but I'm not disassembling the bottom end. No measurements, but the cylinders look great - no scoring or wear at all. May not be healthy, but I really love this car... Almost as much as I love my 986!! There's a little demon on my shoulder telling me I should put this engine in the 986.

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