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Increased Displacement Effects On Fuel Trims

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YOUR RESEARCHIncreased Displacement Effects On Fuel Trims

Leading reported evidence

Test engine

Performed · outcome unconfirmed

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Unsuccessful attempts: 1
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Performed · outcome unconfirmed
I don't believe that I have a vacuum leak because I smoked tested the engine after installation.
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Increased Displacement Effects On Fuel Trims

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Smoke-test engine

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Suggestion
I am going to smoke-test the engine again when it warms up a bit outside.
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Increased Displacement Effects On Fuel Trims

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Leading evidence: 'Test engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Smoke-test engine' (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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Smoke-test engine

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Suggestion
I am going to smoke-test the engine again when it warms up a bit outside.
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Increased Displacement Effects On Fuel Trims

Frequently discussed actions (2)

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Smoke-test engine

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
I am going to smoke-test the engine again when it warms up a bit outside.
Original post Read captured discussion
Increased Displacement Effects On Fuel Trims

Test engine

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
I don't believe that I have a vacuum leak because I smoked tested the engine after installation.
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Increased Displacement Effects On Fuel Trims

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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

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Generation: 20261026T074343Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I can�t really find any data on this, to keep it simple if displacement is increased, 3.4-3.8, would the fuel trims increase from factory settings? FRA 1/2- 1.13 1.13 RKAT 1/2- .66 .66 A big thanks to Amargari for posing the question on another thread, just trying maybe get more responses with a better title. Thanks!!!

POST 2Original post

I'm not an expert, but I would guess yes. If you are letting in more air, then you need more fuel to keep the air/fuel ratio correct. This is what I believe the FRA and RKAT numbers represent. If I am wrong, please someone correct me. FRA is fuel trim adaptation under load. A value of 1 means that the amount of fuel being introduced by the injector matches what the reference table is expecting when the car is driving (not idling). Anything over 1 means it is adding fuel. Anything under 1 means it is removing fuel. RKAT is the Fuel trim when the engine is at idle. For RKAT you want around “0”. If it is below “0”, the car is running rich at idle and it is taking away fuel in the Idle range. If it is above “0” the car is running lean and it is adding fuel at the idle range. BTW I have a 4.0 with a GT3 throttle body and here are my numbers. I don't believe that I have a vacuum leak because I smoked tested the engine after installation. I also have brand-new injectors. RKAT = 2.34 - 2.39 FRA = 1.00 - 1.04

POST 3Original post

Quotes source post: 18645601

@hardtailer pointed out that my hypothesis is wrong on your other thread with the following response:

POST 4 / ORIGINAL POSTEROriginal post

Yes, thanks for your response. This thing is kicking my� we�ll you know. Haha

POST 5Original post

Quotes source post: 18645689

Your thread has me worrying about my RKAT values in the 2.34 - 2.39 range. I am going to smoke-test the engine again when it warms up a bit outside.

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