The possibilities are either the EGR flow sensor is defective, or the EGR
valve itself is clean (since you removed and cleaned it) but the passages
within the intake manifold and/or the EGR exhaust tubing is still dirty and
restricting EGR flow. Check to make sure all passages are open.
A smog check station would test the EGR valve flow by attaching a hand
vacuum pump to your Toyota Celica's EGR valve directly, and attempting to
open the valve manually. If there is adequate exhaust flow through the EGR
valve this procedure should cause your Toyota's engine RPM to drop to at
least 500 rpm while the valve is open. If engine RPM drops, but not nearly
enough to stall the engine, then you've got a exhaust flow problem and you
should re-check the intake and exhaust ports.
posted by SmogTips Support
