Originally Posted By Supercuda
Originally Posted By 69_SIX_PACK



Today it acted up today and I checked the codes:
P0300 - Multiple Cylinder Misfire
P0172 - Fuel System Rich
P0132 - O2 Sensor High


Thinking the rich code is were I would start, the other two are probably symptoms of being too rich.

I'd probably start by putting a gauge on the fuel rail and checking for a leaky injector.



I agree with this but it would be good to know the count on the codes to know which set first. If an injector sticks open and causes any cylinders to run rich it can set that Fuel System Rich code first. And then when a cylinder missfires of course it will set the missfire code since to rich can cause the missfire. And the 02 high is from running rich as high reading is also rich and low reading (volts) is lean. Also if the fuel pump pressure ran to high from a bad fuel pressure regulator. But your setup should be a returnless system so the fuel pressure regulator is right on the fuel pump in the tank. But I agree it sounds like it goes rich at times and then missfires. Ron

Last edited by 383man; 10/13/17 10:07 PM.