David Armstrong
10.05.2021 19:10:24
Want an easy way to save $500? Rotate your tires at least three times per year
See full version: Engine Light Is On: 1998-2005 Chevrolet Blazer - What to Do
Want an easy way to save $500? Rotate your tires at least three times per year
Animals love the sweet smell of antifreeze, too bad it's toxic! Fix your minor leaks more
Did you know that heat is worse for your battery than cold? Replace it every 4 years here
Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road. more
If you do need to replace them all, they can be somewhat pricey. It is possible to isolate which coil pack is bad by using a multimeter. Here’s a great YouTube video on how to do just that. This can save you a lot of money over just replacing the whole set at one time.
There are also non ignition related circumstances that can cause a misfire. That would include lack of fuel pressure, bad fuel injectors, or even a timing chain (or belt) that has jumped. Since there are so many reasons that a vehicle can misfire, we recommend testing for trouble codes first.
Bad Coil Packs are one of the more problematic ignition issues that can occur with the Chevy Blazer. A bad oil pack can make your Blazer almost un-drivable. Or it may have little effect at all on the engine’s ability to run. It’ll get worse as they lose their ability to fire the spark plugs.
Fill up with gas and make sure the gas cap is on tight(I make sure to click 3 times.) After you drive for about 20 miles with the full tank and a tight gas cap the pressure in the tank will shut off the check ingine light. The pressure in the tank can drop after appox. 1/2 tank of gas and the check ingine light will come on. here
You can also unplug your battery for 30 min. to reprogram your computer after you have tightend you gas cap and it should stay off if that is your problem. here
There are many things that can cause the P0420 trouble code in your Blazer. Here are the most common ones.
Unless you have an exhaust leak, you’ll probably need to test the O2 sensors and/or catalytic converters. Here are a couple of good guides to help with that.
Your Blazer has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. more
This page is meant to help you troubleshoot the Chevy Blazer P0420 trouble code. It covers P0420 meaning, symptoms, causes, and possible solutions. WIth the Blazer, OBDII P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. Jumping straight to replacing the O2 sensor can cost you time and money. P0420 is the most common OBDII code there is. more
If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0420 code.