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Re: nissan ga15 engine idle adjustment locations
The idle speed is computer controled, it is not adjustable, you most likely have sludge in the throttle valve and the idle speed control air bypass valve, clean them with carb spray with the engine running.
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18-22 DegreesBefore top dead center - When throttle positionsensor disconnected and using suitably programmedscan tool.When adjusting idle speed, set parking brake & chock drive wheels, curb idle speed (750-850 RPM)transmission in neutral.
8-12 DegreesBefore top dead center - throttle position sensorharness disconnected.When adjusting idle speed, set parking brake & chock drive wheels, curb idle speed (700-800 RPM)transmission in neutral.
8-12 DegreesBefore top dead center - throttle position sensorharness disconnected.When adjusting idle speed, set parking brake & chockdrive wheels, curb idle speed (700-800 RPM)transmission in neutral.
The idle speed of a warm engine should be 750 to 775 RPM. The idle is adjustable, but the idle could be high due to another sensor problem.
In that case a mechanic should do a scan to see if an error code exists.
Hope this helps.
what is the vehicle , model age etc ? in general this sounds like a timing problem or the vacuum system may have a split/leak etc , i've included a link to a nissan forum as they are the major user of this engine hope this helps Cam Timing for my Nissan B13 GA15 engine Nissan Forum
An IAC (idle air control) motor is designed to adjust the engine idle RPM
speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM
(powertrain control module) receives information from various sensors and will
output signals to adjust the idle air control motor in or out to adjust engine
idle speed by controlling engine idle air. An idle air control motor can fail
one of two ways, either the motor short circuits and stops working or the motor
will develop high resistance and cause the idle air control motor to react
slowly, either failure can cause the engine to
stall at idle. When a trouble
code scan is performed it sometimes won't always detect a failed or weak
idle air control motor.
There should be an idle speed adjustment screw near where the throttle linkage connects to the carburetor. Turn it CCW a number of turns until the speed drops down. Make sure the choke has completely released before making this adjustment. Hope this helps!
3-13 Degrees Application: With manual transmission
Note : Before top dead center, at specified curb idle speed. Locate data link connector & connect jumper wire between ground & engine test terminals. After completing adjustment, remove jumper wire. Curb idle speed (750 RPM) transmission in drive.
3-13 Degrees Application: With automatic transmission
Note : Before top dead center, at specified curb idle speed. Locate data link connector & connector jumper wire between ground & engine test terminals. After completing adjustment, remove jumper wire. When adjusting idle speed, set parking brake & chock drive wheels. Curb idle speed (750 RPM) transmission in neutral
On any carburator,one screw is for the idle speed, the other the air/fuel mix.Start the engine and let it get plenty warmed up. Adjust the idle screw to make the engine run slow. Turn the air/fuel screw in until the engine starts to die then out till it starts running loady.You want the screw between these two locations. Adjust it till the engine runs the fastest. Now adjust the idle speed screw to about 1000 RPM.
I hope this helps you.