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Old 03-25-2002, 07:38 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
CAPS LOCK Please....

Code #4 is Air Injection and I suspect that you have a bad vac. hose connection between the intake and the switch-over valves.
Take the front, top cover off [ in front of valve cover] and trace the hose where it passes the front of the engine.. Both the egr and air pump SOVs are fed vac from a common line. If this leaks/cracked, etc, both codes will display.
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