I have a 2006 Impala LT 3.9 It has 179,000 miles and generally runs good. Recently I put fuel injection cleaner in the tank and decided to make a few runs manually shifting at 3000 rpm. During these runs I didn't go full throttle. I simply ran it to 3000 rpm and shifted to second gear and so on. As it approached 3000 rpm I got a huge noticeable misfire and a blinking check engine light. As I cam to a stop the light went out and so did the miss. What could be wrong here? I did scan it for codes and got the P0300 code.
In the past I did get lean bank one codes but haven't gotten that particular code recently. Any help would be greatly appreciated as I am stumped on this one.
Thank You - Rob Mosley
Daytona Florida USA
Unfortunately, the p0300 random misfire code is an extremely generic code that can have dozens of possible causes. Now. The only way I can figure that out would be to drive it with my fancy scan tool hooked up. Then when it misfired it records that data, I'm going to analyze the data. Then I could see if it was perhaps a bad injector or a bad ignition coil or whatever. I couldn't guess what that basic information you have
@scottykilmer thank you for the response. It hasn't done this since I posted the question here. I should add that I have since changed the spark plugs and there is a noticeable difference between the front bank of plugs and the rear bank of plugs. The front plugs looked like they were indeed experiencing a lean condition as compared to the normal look of the rear plugs.. I'm starting to think one of the oxygen sensors might be bad however I get no codes on my scan tool for a bad oxygen sensor.
I'm starting to think one of the oxygen sensors might be bad however I get no codes on my scan tool for a bad oxygen sensor.
Scotty does not usually revisit topics he has already answered.
The fact that you get no codes is not really relevant. Problems need to rise to a certain level before a code is triggered. Also there is no code for a bad O2 sensor per se. In general codes don't tell you that a specific part is bad, they tell you a condition exists that usually has multiple possible causes.
Have you analyzed live data for problems, as Scotty indicated?
