9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAre te 3.4 and 3.6 interchangeable?
Reported or suspected cause
of the electronics associated
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
It's not about the block....physically it all fits just fine with all of the mounting points being the same....the problem is all of the electronics associated with ECU.
Leading evidence: 'of the electronics associated' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'of the electronics associated' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Run into a used 3.4 out of a 1999 c2' (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.
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 · Original poster
He has been looking for a used engine to get it back on the road and has run into a used 3.4 out of a 1999 C2.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
of the electronics associated
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
It's not about the block....physically it all fits just fine with all of the mounting points being the same....the problem is all of the electronics associated with ECU.
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.
9 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: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
A friend of mine has a 2006 C4S that lost the engine to an IMS failure. He has been looking for a used engine to get it back on the road and has run into a used 3.4 out of a 1999 C2. Will this engine work in his 997. He would rather have a 3.6 but this is a deal he cant pass up if it will work.
Thoughts?
Not without major changes to wiring harness, ECU, cluster, climate control (yes, odd, but true), etc. Different fueling (one is returnless), different variable cam timing systems. It wouldn't be an economical choice once all is said and done.
^ True, and after all is said and done it will have to go to the dealer because the key, rfid pill, ECU and immobilizer will all have to be reprogrammed. Very odd that a 2006 would have an IMSB problem. Who determined that?
+1
This is a big job...I did the reverse and did all of the above in reverse when I put A 2007 997S 3.8 in my 996.1
Just the rewiring alone was probably 10k not included the cluster,HVAC, abs pump etc. No way does this make sense since performance will be less. I did it because of increased performance. Much cheaper by like a factor of 3 or 4 to stick with 997 engine
^Lowpue went in the (only) direction that makes sense. IMO, if you are going to dump a crap ton of money into a conversion, the only way it makes sense (to me) is to upgrade to a newer or more performant power plant. Why would anyone do this to get into a smaller, older engine...(rhetorical question)
The intention was to save money not put more in for less. His thought was to take the 3.4 engine long block and swap the electronics sensors etc. I guess that we were unaware that it was a completely different block. Been in the GM small block world too long I guess.
My personal assessment is that he won't save any money doing this. The least expensive option (still risky) is to buy a salvage engine from a well reputed vendor from the same generation (996.2 donor, 996.2 recipient), with some sort of warranty. It's risky because you may be inheriting someone else's problems. It can work out though (I am living proof). You don't need to worry about converting anything: pure plug and play. And yes, said from experience, not internet theorizing..
It's not about the block....physically it all fits just fine with all of the mounting points being the same....the problem is all of the electronics associated with ECU.
