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Problem revving engine above 4500 RPM

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHProblem revving engine above 4500 RPM

Leading reported evidence

Replace 5900 rpm

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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: 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
My symptoms were: the car have problem acceleration over 4000 RPM, 1st gear auto gear change 5900 RPM, it is not possible to rev the car past 5900 RPM, full throttle acceleration is not linear, under 4000 RPM normal manners.
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Problem revving engine above 4500 RPM

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Leading evidence: 'Replace 5900 rpm' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 5900 rpm' (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.

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1 matching discussions · 2 captured posts examined · 0 partial discussions

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Test computers

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
I decided to go to visit Porsche dealer in Poland to test both computers for any errors.
Original post Read captured discussion
Problem revving engine above 4500 RPM

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 5900 rpm

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
My symptoms were: the car have problem acceleration over 4000 RPM, 1st gear auto gear change 5900 RPM, it is not possible to rev the car past 5900 RPM, full throttle acceleration is not linear, under 4000 RPM normal manners.
Original post Read captured discussion
Problem revving engine above 4500 RPM

Test computers

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
I decided to go to visit Porsche dealer in Poland to test both computers for any errors.
Original post Read captured discussion
Problem revving engine above 4500 RPM

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.

2 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.

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

Outcome without a verified action link
After erasing the sonda lambda codes there is no change in driving.
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No unique explicit quoted action; no causal link assigned

Generation: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Few month ago I decided get some more power for my European version of Porsche 996 tiptronic 1998 model. I have ordered the tuning in USA from company GIAC. Unfortunately after installing both computers (tiptronic and ECU were tuned) the car is was not running correctly. My symptoms were: the car have problem acceleration over 4000 RPM, 1st gear auto gear change 5900 RPM, it is not possible to rev the car past 5900 RPM, full throttle acceleration is not linear, under 4000 RPM normal manners. I decided immediately to switch back to my original engine ECU hoping that this might me only software related problem. After installing my original computer (still the tiptronic computer is modified) the problem did not disappear! I decided to go to visit Porsche dealer in Poland to test both computers for any errors. Result are: Tipronic ecu – no codes, Engine ECU – lambda sonda error (bank 1-3, 4-6), Engine ECU – airbag, Engine ECU – aircondining. After erasing the sonda lambda codes there is no change in driving. Do you have any idea what to look for? Maybe this is MAF problem, sonda lamba? If you have any idea I would appreciate any help.

POST 2Original post

maybe the altered tiptronic module is interfering with the factory ECU?

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