Rick's Free Auto Repair Advice

Posts Tagged: P0300

Check engine light on, rough engine

Fix for rough engine and check engine light GM service bulletin #12-06-01-001 for Service Engine Soon Light On and Rough Running Engine GM has issued a service bulletin #12-06-01-001 to address a check engine light on (service engine soon light on), a P0300 trouble code and a rough running engine on the vehicles listed below. GM has determined that he rough running engine is caused by cracked or oil fouled spark plugs, usually on cylinders #1 and #7. Vehicles affected 2007-2011 Chevrolet Avalanche, Express, Silverado 1500, Suburban, Tahoe 2007-2011 GMC … Read More

P0300 random misfires

Diagnose P0300 random misfires If you own a GM vehicle and encounter a check engine light and P0300 random misfires code, read this service bulletin #PIP5264 before replacing any parts. The bulletin applies to the vehicles listed below: 2004-2011 Cadillac STS 2004-2015 Cadillac CTS SRX 2013-2015 Cadillac ATS XTS 2005-2015 Buick Lacrosse Allure (Canada only) 2008-2015 Buick Enclave 2010-2015 Chevrolet Camaro 2011-2015 Chevrolet Captiva Sport 2015 Chevrolet Colorado 2008-2015 Chevrolet Equinox 2012-2015 Chevrolet Impala 2008-2012 Chevrolet Malibu 2009-2015 Chevrolet Traverse 2007-2015 GMC Acadia 2015 GMC Canyon 2010-2015 GMC Terrain 2007-2009 … Read More

Chevy Silverado misfire

Fix Chevy Silverado misfire Some Chevy Silverado owners with the 4.8L may encounter an intermittent P0300 misfire trouble code, along with excessive emissions, poor idle quality, hesitation, and stalling. You would normally start by checking your Chevy Silverado fuel trim with a scan tool. But several shops report problems with an intermittent and corroded ground connection that can cause all these problems on the 4.8L engine. The misfire condition may appear during turns or any time the engine moves in it’s mounts. So before checking all the usual suspect like … Read More

Toyota Misfire

Toyota Camry Misfire and hesitation. Check engine light on If you experience a Toyota misfire misfire on a Camry you may be looking at a binding variable valve timing actuator (VVT). The VVT actuator is driven by oil pressure to retard or advance timing. The PCM uses input from multiple sensor to determine engine load and commands oil pressure to the advance or retard side of the actuator. Use the wrong oil viscosity can affect how the VVT responds to PCM commands. If the engine experiences sludge buildup, that can … Read More

Understanding the Most Causes of Engine Misfires

Learn the 7 most common causes of engine misfires An engine misfire occurs when one or more cylinders fail to fire properly, leading to rough idling, loss of power, and decreased fuel efficiency. If left unaddressed, misfires can cause further damage and costly repairs down the line. Fortunately, by understanding the most common causes of engine misfires, you can take steps to diagnose and remedy the issue before it escalates. Here are some of the top reasons why your engine might be misfiring: 1) Worn spark plugs 2) Bad ignition … Read More


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