Posted: Thu Nov 20, 2014 12:13 am Post subject: P0300 Code
Hey guys (and gals), I've been trying to diagnose a P0300 code on my 2005 3.4L Impala without much luck, so I could use some assistance.
A little over three weeks ago, before my 11AM shift, I tried to start my car (which was starting just fine before). It started, but was sounding "sputtery" and was running as if a cylinder was not firing. I shut it off, and tried again. However, this time, I tried pumping the gas when it wouldn't turn over. That caused it to flood, and the gasoline to start leaking from the drivers side of the engine (I later found out it was from where the throttle body and the duct coming from the air intake meet). Finally, it stopped turning over at all.
Before that morning, I had been driving it almost daily, and the only thing I did differently was I took a longer than normal trip(about twice the mileage compared to what I normally drive). Other information about my car: it's got over 190,000 miles on it, and the head had been rebuilt before I bought it back in July.
Now, in the weeks since then, it has been parked, only starting it maybe once or twice a week. When I do start it, it will run rough, and will smooth up if I pull the Fuel Pump Relay, otherwise it'll stall out on me. I have checked the spark plugs (replaced them, and made sure the new ones were properly gapped), checked the plug wires, and I checked the coil packs (by replacing one, testing, and moving to the next, etc.). So, I feel that the "spark" element is fine.
I got an ODBII adapter, and, using the Torque app, checked for fault codes and dumped the freeze frame data. It came up with a "P0300: Random/Multiple Cylinder Misfire". Here's the freeze frame data:
I may be way off, but look into your Fuel pressure regulator.
My thoughts exactly. I would also change the air and fuel filters while you are at it. If it was throwing a specific P0301-P0306 code as well, I would say to check the ignition coils, wires, and plug for that cylinder but you may be okay there.
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