Hi All.

I have an 88 Firebird and I am looking for the more info/location for/of the following:

Mass Air Flow Sensor
Sensor on Passenger side near Firewall (039 1129) with a number 466 on the top and an inline three connector plug and single vacuum line underneath.

Basic problem is when it's cold it idles rough/low and stalls, but when it warms up it at least idles, but still a bit low (Around 500 RPM)

I'm thinking it may be the MAF or even EGR... anyone have any good tests for either?

Thanks in advance

Steve C - RI

 

Car runs pretty rich as well; more so when it's cold. Not as much when it warms up.

Steve C - RI

 

You are describing a MAP sensor, not a MAF sensor. A mass airflow sensor would be in the duct between the air filter and throttle body.


The later cars use a speed density system with a MAP (manifold absolute pressure) sensor instead of a maf sensor.

 

When I unplug the MAP Sensor, the car idles fine.

Can I assume the MAP Sensor is bad?

If so, can I drive it with it unplugged (Leave Vacuum Line plugged in) or would that be bad?

Steve C - RI

 

https://www.thirdgen.org/forums/tech...ing+MAP+sensor




Replace it as soon as you can. With it unplugged the car will run in alpha-n mode, where it bases fueling solely on RPM and throttle position.