Tech Tip Corner
1990 Honda EGR System
SYMPTOM: Surging at 2000 RPM - driving down the road
CAUSE: Restricted EGR passages
DIAGNOSIS: If the surge goes away when the EGR is disconnected, and no other problems
can be found (i.e. poor electrical connections, leaking vacuum hoses, etc.) the EGR
passages may be clogged or restricted.
REPAIR: Remove the EGR valve and spray down into the EGR passages with carburetor
cleaner and allow the cleaner to dissolve the restriction (carbon, gum, varnish) for about 45
minutes. Reinstall the EGR valve. Start the engine and run at 2000 RPM for about 2 minutes.
This procedure should clean the passages of carbon deposits.
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