EGR Valve on 99+ Grand AM Testing-Replacing

01-08-2007, 03:13 PM
This is for 99+ N-Bodies
Which includes; 2.4L 4 cyl, and the V6 3.1 & 3.4L;
Alero(99-2000), Cutlass(97-99),
Grand AM(99-2000), Malibu(97-2000)

- On the V6 its behind the TB, cant miss it.
- On the 4 cyl the EGR is located off the side of the intake.
*You will have to remove the air intake tube and air duct around the TB to get to it.
*Not all 4 cyl have EGR's, see list below.
The LD9 Twin Cam was a 2.4 L Quad 4 variant with balance shafts, debuting in 1996. Bore was decreased from 92 mm to 90 mm and stroke increased from 85 mm to 94 mm for better torque, and power was increased to 150 hp (112 kW). This engine received a minor update halfway through the 1999 model year that eliminated the EGR, increased the compression ratio from 9.5:1 to 9.7:1, and switched from low impedance fuel injectors to high impedance.


1996-2001 Chevrolet Cavalier Z24
1996-2001 Pontiac Sunfire GT
1996-2001 Pontiac Grand Am
1996-1998 Oldsmobile Achieva
1999-2001 Oldsmobile Alero
1997-1999 Chevrolet Malibu

--Testing EGR--
4 cyl EGR

- Disconnect the elec connector from the EGR.
- Using a voltmeter Probe terminal #5 on the electrical connector with the positive (on the harness side),
and apply the ground to the engine.
- Turn the key on, On the V6 battery voltage should be present,
- if not check the curciuts(wiring) from the PCM to the EGR.
- If the curcuits are good have the PCM checked by a dealer.
- On 4 cyl models battery voltage will only be present when the PCM is controling the EGR.

- With plug still disconnected,
probe # 4 with the posistive,
and connect the ground to # 2.
- Turn on the key, you should read approx 5 volts.
- If not check the wiring,
if they are good same as above, contact a dealer.

-- To test the EGR valve,
use an Ohm meter to check for continuity of the EGR valve position and Egr solenoid coil.
- Check terminals #2 & #4(EGR sensor),
and acrossed terminals #1 & #5(egr coil sol).
- If either check reveals an open circuit,
replace the EGR valve.

-To remove simply unplug wire harness.
-Remove 2 mounting bolts.
-Remove old gasket(us a scrapper to clean of any old gasket), and replace with a new gasket. Also make sure the port/passages are clear and not clogged with carbon build up. If not clear this can cause false DTC readings.
-Install in the reverse procedure.

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