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Differences between 3.4 engines

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7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHDifferences between 3.4 engines

Leading reported evidence

Use engines

Performed · outcome unconfirmed

No successful repair reported for this finding.

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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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster

I'm looking at used engines for my '99 996.

Original post Read captured discussion
Differences between 3.4 engines
Frequently discussed work

Replace engine wire harness and the tb

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Suggestion

I think you will need to change the engine wire harness and the TB.

Original post Read captured discussion
Differences between 3.4 engines
Read full discussion summary

Leading evidence: 'Use engines' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace engine wire harness and the tb' (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 engine wire harness and the tb

Suggestion or failed attempt

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Unsuccessful attempts
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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
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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

I think you will need to change the engine wire harness and the TB.

Original post Read captured discussion
Differences between 3.4 engines

Use returnless system

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No successful repair reported for this finding.

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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

Some have a return line and some use a returnless system but not sure on the cutoff years..

Original post Read captured discussion
Differences between 3.4 engines
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.

Replace engine wire harness and the tb

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

I think you will need to change the engine wire harness and the TB.

Original post Read captured discussion
Differences between 3.4 engines

Use engines

No successful repair reported for this finding.

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Reported fixes
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Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
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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

I'm looking at used engines for my '99 996.

Original post Read captured discussion
Differences between 3.4 engines

Use returnless system

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

Some have a return line and some use a returnless system but not sure on the cutoff years..

Original post Read captured discussion
Differences between 3.4 engines
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.

7 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I'm looking at used engines for my '99 996. There are a couple of them on eBay, one is a 1999 M96.01 engine and one is a 2000 M96.04. The '99 has a mechanical throttle and the 2000 has electronic. I need the mechanical one and It's an easy conversion. Besides that, are there any differences I should be concerned about? Is there a preference for one over the other?

POST 2Original post

You sure it�s an easy conversion? There is one here on the forum for sale that seems to have all of the right upgrades and it�s a cable throttle.

POST 3 / ORIGINAL POSTEROriginal post

Pretty sure it's as simple as unbolting the electronic throttle and bolting on the cable one. My car is already set up for the cable.

POST 4Original post

I think you will need to change the engine wire harness and the TB. You will need the ICV connector.

POST 5Original post

There could also be a fuel line issue. Some have a return line and some use a returnless system but not sure on the cutoff years..

POST 6Original post

Quotes source post: 14691876

I just did this last year. 1. You need to swap the throttle body. 2. You need to swap the entire engine wiring harness. Just do it one connection at a time and you will be fine. 3. You may need to swap the fuel rails. Some cars have the fuel lines going through the AC compressor for fueling. I did both swaps in under 4 hours (included removing both wiring harnesses.

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