Rennlist

Boxster engine in 1999 996 - Possible??

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHBoxster engine in 1999 996 - Possible??

Leading reported evidence

Replace will need

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
Put the 2 engines side by side & it will be obvious what simple changes will need to be done before installing the "new" engine.
Original post Read captured discussion
Boxster engine in 1999 996 - Possible??

Read full discussion summary

Leading evidence: 'Replace will need' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace will need' (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 · 8 captured posts examined · 0 partial discussions

Compare 1 other evidence results

Use throttle body

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
Will need to use your throttle body.
Original post Read captured discussion
Boxster engine in 1999 996 - Possible??

Frequently discussed actions (2)

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

Replace will need

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
Put the 2 engines side by side & it will be obvious what simple changes will need to be done before installing the "new" engine.
Original post Read captured discussion
Boxster engine in 1999 996 - Possible??

Use throttle body

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
Will need to use your throttle body.
Original post Read captured discussion
Boxster engine in 1999 996 - Possible??

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.

8 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: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey gang. Had an engine failure in my just recently purchased 1999 996 3.4 Tiptronic convertible. The car had 145k miles. Not sure what is wrong, but it doesn't matter. Loud metal impacting metal noises upon trying to crank. I knew it was a risk, but such is life. The rest of the car is a 9 outta 10 What does it take to put a Boxster engine in my 996? Those engines are cheaper. Which engines can I just "drop in"? I don't care about the drop in HP. This car is meant to be my DD, to save my beautiful 2002 996.2 convertible 6 speed. BTW, I have done an engine/trans swap in another 996.2, so I have an idea of the process.

POST 2Original post

Quotes source post: 14319395

00-02 3.2 litre engine will be the best. Put the 2 engines side by side & it will be obvious what simple changes will need to be done before installing the "new" engine.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 14319401

Will the computer in the '99 take the 3.2 engine ok, without throwing a CEL? What year engines will drop straight in? Thanks!

POST 4Original post

00-02 is fine. Will need to use your throttle body. From everything I've read, the 3.4 tune should be ok with the 3.2 engine.

POST 5 / ORIGINAL POSTEROriginal post

Why "my" throttle body? Aren't they both controlled by cable? Aren't they the same throttle body?

POST 6Original post

Quotes source post: 14319395

You are not the first to want to do this. There have been as I recall one or two other threads on this subject. Here's a link to one such thread: https://rennlist.com/forums/996-foru...n-a-996-a.html Not a long thread but maybe you'll derive something of value from it.

POST 7Original post

Quotes source post: 14319862

No 2000 & newer are drive-by-wire. most people prefer the cable T/B

POST 8Original post

1997-99 cable throttle 2.5 is 205 hp and compatible . I believe the engine mount will be different

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