SOURCE: PO 1665 code 1998 buick rivera
EVAP is for Evaporative emissions control system, so no this is not EGR, that is Exhaust Gas Recirculation system, as far as the P1665 goes it is related to the other trouble code P0440, u will need to replace the EVAP system Purge flow control solenoid. This should correct both problems after u replace the part disconnect the battery for 5 min's to reset system.
SOURCE: timing spec. 1998 chev 1500 pickup with a 5.7 liter
you need a scan tool to check the timing. You can get close by getting the #1 piston at top dead center, and then dropping the distributor back in, making sure it lines up with the oil pump shaft. then rotate the distributor back and for untill it runs smooth. again this will only get you close. you will still want to have a mech. check with a scan tool.
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