05 Trailblazer, replaced vent and purge solenoids. A few ...


05 Trailblazer, replaced vent and purge solenoids. A few weeks later, code for misfire on cylinder 2.My last test drive, I drove for about 5 miles, then check [engine](/topics-engine-chevy/) light came on and started blinking at a...

05 Trailblazer, replaced vent and purge solenoids. A few weeks later, code for misfire on cylinder 2.My last test drive, I drove for about 5 miles, then check [engine](/topics-engine-chevy/) light came on and started blinking at a stop light, and felt like it was going to die. Stoped a minute later at a conveniece store, where I shut engine off. 5 minutes later, drove home, no check engine light, no issues. To be safe, next day, I replaced all 6 coils (blue streaks coils, AC Delco iridium plugs) and plugs. Sprayed carb cleaner into intake, cleaned with a clean rag. Put everything back together. Started motor (started with no struggle), but immediately started misfiring with p0300 multiple.Removed coils and plugs l, inspected- all normal. Re-installed. Bypassed MAF sensor, lifted coils while idling, getting good spark from coils, engine performance at idle changed slightly as expected when each coil was lifted from plug.Re-installed everything completely, started, rough idlle for 5 minutes, then again with flashing check engine and p0300.

Automotive Expert
Hello, my name is \*\*\*\*\* \*\*\*\*\* I will be glad to assist you with this misfire issue. I see where you replaced all the hardware that could be causing the code to set, but there are a few other things you will need to check as well. The first thing you should do is get an advanced scan tool so you can read the misfire counts on the individual cylinders. This will tell you which cylinder or cylinders are actually misfiring the most. Then you will want to check the fuel injectors for that cylinder or cylinders as well as performing a cylinder compression test on all the cylinders and possibly a cylinder leak down test on the cylinders that are misfiring.

Thank you. So hypothetically, if clogged fuel injectors is my issue, what would be my options to resolving this issue? Keep in mind I just spent $500, and and currently looking for work, please.
Automotive Expert
Well, you could try to use a fuel injector cleaner kit, and if that doesn't work you will have to replace the injectors. I would eliminate the engine as the cause of the problem first, though (cylinder compression and leak down) because that would be the most expensive repair.
Automotive Expert
I hope this information was helpful. If you need anything else, please let me know and I will do my best to assist you. I wish you well, and thank you for using JustAnswer.

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