Airflow Meters -Nissan Micra Throttle body

Nissan Micra stalling and hesitation problem
The Nissan Micra has a very common problem with engine stalling erratic idle speed and hesitation. These common faults are invariably always caused by the throttle body sometimes called the air mass meter.

Symptoms include:
Stalling
Hessitation
Losing power
High emissions
Poor drivability
Poor idle speed
High fuel consumption

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There are two types of throttle body for the Micra the early cars were fitted with the JECS these were fitted between 1993 and the year 2000. From the year 2000 until 2003 K11 shape Micra cars were fitted with the Bosch type. See here

The Air Flow Meter works by seeing how much current it takes to keep a wire at a specific temperature. The fault will often not be shown on diagnostic system as the meter will still be operating within the limits the computer believes are OK, but putting the correct amount of fuel in for idle when the throttle is fully open will result in a very weak mixture and thus a lack of power.

The air flow meters will occasionally fail completely which will bring up a light on the dash and the symptoms described here are only the usual ones, as we have known the fault to become apparent in other ways.

Luckily Airflow meters are very easy to fit and normally only take 15 minutes to fit you do not need any special tools to fit them and with a very small purchase price they are no major problem when there go wrong.

Nissan Micra base idle set up

Fit unit
Run engine unit normal operating temp
Run for 2 minutes at 2500rpm
Let Idle
Stop Engine
Disconnect throttle position sensor
Restart engine & run unit stable
Idle speed : manual 600rpm automatic 700 rpm
Adjust by using screw under cable connection surrounded by a spring
If need be Adjust the air bypass screw.
Stop engine
Reconnect Throttle Position sensor
restart engine
RPM will be high to start with, after 2-3 min the revs should return to normal

throttle

Beware however as Lambda (or Oxygen) sensors in the exhaust can also give very similar symptoms to Air Flow Meters. Lambda sensor problems click here

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