Does the air condition consume more fuel - 2003 Nissan Primera

P0300 Random misfire - lean condition , vacuum leak , low fuel pressure , fuel filter plugged partially , mass air flow sensor .
If the misfire is random, check for the following conditions:
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System Grounds: Ensure all connections are clean and properly tightened.

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MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.

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Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.

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Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.

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Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.

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EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Possible but not probable. Depends on how much "too much" fuel consumption to you is, and what other maintenance you have neglected. There are many, many reasons for poor fuel economy. Start with a good tune up then see how the fuel consumption is. Worn shocks may have some effect in that they wheels may often lose contact with the surface, spin excessively and thus, burn more fuel but this isn't a major factor in fuel consumption normally. It's more apt to be one of many other factors going on with your vehicle. Check and/or replace spark plugs, fuel injectors, air filter, PCV, oil & oil filter, and any other items recommended for your vehicle's scheduled maintenance for the mileage your vehicle has.

engine consume lot of fuel.clogged air filter.low tire pressure.faulty emission control device.dirty fuel injectors.heavy foot on accelerator.lot of short stops like driving in the city.running AC will consume gas.high mileage engine low compression assume lots of fuel.slipping transmission.weak ignition.driving up steep grades or mountains burns more fuel.

Check the condition of the following:
1) Spark plugs, leads and coil(s)2) Air filter3) Fuel filter4) Exhaust for leaks and catalytic convertor for blockage.5) O2 sensor.

167- no change in throttle position sensor range
042- rich condition
...sounds like the throttle position sensor is going bad, unable to measure correct amount fuel per acceleration; sending too much- resulting in a rich (too much fuel) condition.
engine light may begin to flash alerting you that too much fuel consumed at this rate can damage the catalytic converter

REPLACE AIR FILTER.CLEAN FUEL INJECTORS,CHECK TIRE PRESSURE.LOW TIRE PRESSURE WILL CAUSE LOT OF FUEL CONSUMPTION.CITY DRIVING WILL BURN LOT MORE GAS,STOPPING VECHICLE THEN GOING WILL CAUSE MORE GAS BURNING, YOU NEED POWER AND FUEL TO GET VECHICLE IN MOTION,BY IT BEING HOT WEATHER, USING AIR CONDITIONING TO KEEP COOL INSIDE WILL CAUSE MORE FUEL CONSUMPTION.

Hi there,

Generally YES.

Most modern engines will idle higher (up to 2000rpm) when starting from cold. As the engine reaches proper operating temperature, the idle should slowly return to around the 700rpm mark (depending on Hyundai's specifications), with no accessories turned on.

If you were to engage an accessory such as Air-conditioning, your engine will then increase its idle speed to compensate for the additional load and to prevent stalling when stopping.

An idle speed of 1.5 (ie 1.500rpm) when engine is hot and parked up, would indicate there is a problem somewhere. This condition will consume unneccessary fuel.

There are many possibilities causing an increase in idle speed.

Have your vehicle diagnostics checked first - this will identify if any sensors/solenoids are not functioning correctly or if there could be possible vacuum leaks. You must do this, before attempting to correct idle speed.

Cheers,



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P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
2. Failed HO2S21
3. Ignition misfire condition
4. Fuel injector problem
5. Engine mechanical condition

P0171 Generic Definition

Fuel trim bank one condition
- The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.

Probable Cause[s]

1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
2. Oxygen sensor defective
3. Ignition misfire-repair
4. Fuel injector problem

If you cleaned the mass air flow sensor (MAF) and your still getiing the problem. You may have to replace it. But before you go there. Strat the car and listen for a lond hissing sound by the throttle body area. If you hear it you have find it .You can hunt down a vacuum leak with a propane tester and watch a tach gauge for for increase RPM's when leak is detected.
Ignition system checks are a little tricky and time consuming. Its easier to use a scopemeter and look for the bad cylinder.
What I believe is you need a new MAF its presenting a rich condition
condition and its being reported as a bad air /fuel ratio.
A rich condition could lead to misfiring.
use the shop manual to conduct the electrical tests needed on the MAF.
If it fail any of them reolace it . Good luck and keep me posted

Make sure the air filter is clean,make sure the oxygen sensor is ok but would have to suspect its carboned up due to vehicle age ,if not working properly it tells the engine to run richer than normal.Also make sure the plugs and spark plug leads are in good condition.It wouldnt hurt to put a bottle of injector cleaner in the fuel tank next service as dirty injectors will also add to fuel use.A few small things to do or check but worth it by the sound it.