How do adjust the air/fuel mixture of a nissan pulsar?

Question:
i need to adjust the mixxture as it is to fuel rich

Answers:

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under the air filter at the rear of the engine there will be a small alan key bolt. if this is turned fractionally it will change the mixture, but be careful as it changes the velocity of the exhaust fumes which have to be within a legal limit.

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The computer automatically keeps it at the correct mixture ratio when the engine's warmed up and it's in "closed loop" operation. A scanner hooked to the OBD-II diagnostic connector under your steering wheel column tells the technician the long and short term "fuel trim" numbers which shows how much the computer is correcting to bring the mixture ratio to the correct ratio.

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You can buy an Actron OBD-II scanner for $100 and monitor the long and short fuel trim numbers yourself to see if the computer is able to correct an imbalanced ratio to the proper ratio or not. If the engine problem is bad enough, the computer can no longer correct to the proper ratio.

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