Trailblazer P0301, Is the coil bad
Chevy Trailblazer P0301, Is the coil bad Here we have a Trailblazer that has a misfire and a P0301 code. I hooked a scanner to the Trailblazer and saw the misfire counter going wild on Cylinder number one. The P0301 code was set because of this misfire . If you had a code reader and saw the P0301 code you could do the same as i done here and move number one coil to a different location.If coil is bad it will then set a new code for the cylinder that is missing. Like a P0302 if moved to cylinder 2 or P0303 if moved to cylinder 3 Always remember also the plug wire or Boot can also be the cause of a misfire . A new coil fixed this miss in the Trailblazer.
How to find a misfire without a scanner 2
Scanners are great tools, but sometimes they aren't any help. That's when understanding the system, and how to test it is all you have. Here are some ways to find the problem
Chevy Trailblazer misfire DIY diagnosis - step one - p0301 p0302 p0303 p0304 p0305 p0306
Here I have a Chevy Trailblazer with a P0302 - cylinder #2 misfire. I show you the basic troubleshooting steps that you can do that only require a code reader and a few hand tools. This procedure can be done regardless of which cylinder is misfiring. First, I swap the coil of the misfiring cylinder with another cylinder. At the same time, I swap the plug of the misfiring cylinder with another cylinder that is NOT the one that I swapped coils with. I then clear the codes and then run the engine. If the misfire moves to the cylinder that I swapped coils with, then I have a bad coil. If the misfire moves to the cylinder that I swapped plugs with, then I have a bad plug. If the misfire stays on the same cylinder, the problem lies elsewhere. Further steps will be shown in future videos. Big thanks to Bill (Kristis Dad) from trailvoy for donating the bad coil!!! UPDATE June 2013 - I know you can also unplug the coils with the engine running to isolate the cylinder. If you want to show that to these guys, how bout YOU make a video. When the average youtube user, who doesn't have much experience doing stuff like that, gets hurt, YOU can live with that on your conscience. I know I couldn't. SMFH.
Check Engine Light & Misfire Diagnosis - AutoZone Car Care
http://www.autozone.com/autozone/parts/Check-Engine-Light-Bulb/_/N-9cjpy?fi lterByKeyWord=check+engine&fromString=search&newYmme=true In the sixth installment of the AutoZone Complete Car Care - Check Engine Light Series, Bruce Bonebrake shows how to diagnose engine misfire codes. Get everything you need to do the job right at http://www.autozone.com