Question about 1998 Pontiac Grand Prix
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Posted on Jan 02, 2017
The PO300 code is random/multiple cylinder misfire detected. Sinsc you have the code PO302, that means that cylinder 2 is the one misfiring, usually a bad coil pack, or spark plug.
Posted on May 12, 2010
SOURCE: What does the P1676 code
i don't know about your reader? but a P1676 is a evap vent solenoid control circuit problem. the solenoid could be stuck or the wires/connections could be corroded, open or shorted
Posted on Sep 29, 2010
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Nov 24, 2015 | 1998 Buick Century
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.
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