1982 CHEVROLET CAMARO intake

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 563
On the 2.8L engine only, an anti-backfire (g
ulp) valve is used to allow air flow
into the intake manifold. This is us ed to help prevent backfire during high
vacuum deceleration conditions. The extra air enters the intake system to lean
the rich air/fuel mixture. The valve is o perated by the intake manifold vacuum to
allow air from the air filter to flow into the intake manifold.

Fig. 1: AIR system operation - cold engine

Fig. 2: AIR system operation - warm engine

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 564

Fig. 3: Anti-backfire valve used on 2.8L engines
TESTING
ANTI-BACKFIRE VALVE
1. Remove the air cleaner and plug t he air cleaner vacuum source. Connect
a tachometer to the engine.
2. With the engine idling, remove the vacuum signal hose from the intake
manifold.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 585
MANIFOLD ABSOLUTE PRESSURE SENSOR
OPERATION
The MAP sensor measures the changes in
intake manifold pressure, which
result from engine load/ speed changes and converts this information to a
voltage output. The MAP sensor reading is the opposite of a vacuum gauge
reading: when manifold pressu re is high, MAP sensor value is high and vacuum
is low. A MAP sensor will produce a low output on engine coast-down with a
closed throttle while a wide open throttle will produce a high output. The high
output is produced because the pressure inside the manifold is the same as
outside the manifold, so 100 percent of t he outside air pressure is measured.
The MAP sensor is also used to meas ure barometric pressure under certain
conditions, which allows the ECM to autom atically adjust for different altitudes.
The MAP sensor changes the 5 volt signal supplied by the ECM, which reads
the change and uses the information to cont rol fuel delivery and ignition timing.

Fig. 1: MAP sensor
REMOVAL & INSTALLATION 1. Disconnect the negative battery cable.
2. Disconnect the vacuum connection.
3. Release the electrical wiring lo cking tab and disconnect the connector.
4. Remove the bolts or release the MAP sensor locking tabs and remove
the sensor.
To install: 5. Install the bolts or snap sensor onto the bracket.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 586
6. Connect the MAP sensor
electrical wiring.
7. Connect the MAP sensor vacuum harness connector.
8. Connect the negative battery cable.

Fig. 2: A common MAP sensor location
INTAKE AIR TEMPERATURE (IAT) SENSOR
OPERATION
The IAT sensor is a thermistor which su pplies intake air temperature information
to the ECM. The sensor produces high re sistance at low temperatures and low
resistance at high temperatures. The ECM supplies a 5 volt signal to the sensor
and measures the output voltage. The vo ltage signal will be low when the air is
cold and high when the air is hot. On so me models, this sensor is also known
as the Manifold Air Tem perature (MAT) sensor.
REMOVAL & INSTALLATION 1. Disconnect the negative battery cable.
2. Detach the sensor electr ical connector locking tab.
3. Carefully remove the sensor.
To install: 4. Install the sensor.
5. Connect the electrical wiring.
6. Connect the negative battery cable.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 587

Fig. 1: Intake air te mperature sensor location on some TBI engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 588

Fig. 2: Intake air temperature sensor location on Tuned Port Injection engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 589

Fig. 3: On some models, the IAT sens or may be located on the air intake hose
THROTTLE POSITION SENSOR (TPS)
OPERATION
The TPS is mounted to the throttle body, opposite the throttle lever and is
connected to the throttle shaft. Its functi on is to sense the current throttle valve
position and relay that information to the ECM. Throttle position information
allows the ECM to generate the required injector control signals. The TPS
consists of a potentiometer which alters the flow of voltage according to the
position of a wiper on the variable resi stor windings, in proportion to the
movement of the throttle shaft.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 591

Fig. 1: MAF sensor
REMOVAL & INSTALLATION 1. Disconnect the negative battery cable.
2. Disconnect the sensor electrical connection.
3. Loosen the clamps and remove the air intake hoses from the MAF
sensor.
4. Remove the sensor from the v ehicle. On some models it will be
necessary to remove the senso r-to-bracket attaching bolts.
5. Installation is the reverse of removal.