FLOOR JET
With engine off, remove air cleaner assembly. Open choke valve (if necessary) and throttle plate. Ensure floor jets are present and open.
EGR SYSTEM (EXCEPT 2.6L)
- Check vacuum lines for correct routing. Warm engine to operating temperature. Some models with EGR delay timers must operate a minimum of 1-2 minutes for EGR to function.
- While watching EGR pintle, abruptly accelerate engine to 2000-3000 RPM. EGR pintle should open at least 1/8".
- Connect a vacuum pump to EGR valve. Idle engine and gradually apply a minimum of 10 in. Hg. EGR valve stem/diaphragm should move smoothly and engine should drop at least 150 RPM.
SUB-EGR CONTROL SYSTEM (2.6L)
Check vacuum lines for correct routing. Disconnect Green-stripe vacuum hose from carburetor. Attach a vacuum pump to vacuum hose. With engine idling, manually open sub-EGR control valve. Apply 6 in. Hg to EGR valve and ensure engine runs roughly. Reconnect vacuum hoses.
VACUUM AMPLIFIER
- Check for adequate manifold vacuum. With engine warm and at curb idle, connect vacuum gauge to hose on vacuum amplifier leading to carburetor venturi port. Attach a vacuum pump to hose and apply 2 in. Hg.
- Disconnect EGR delay timer hose (if equipped). EGR valve should open and engine speed should drop at least 150 RPM. If engine speed does not drop, replace vacuum amplifier.
ELECTRONIC EGR CONTROL SOLENOIDS
For testing of electronic EGR control solenoids, see CODE DIAGNOSTICS in appropriate article in the ENGINE PERFORMANCE section.