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You should be getting a code when the CEL comes on. You need to get a code reader to see what code it projects. This will give you a starting point to research the problem. Keep in mind the code may reference a cylinder misfire, but that does not necessarily mean it is a bad plug. Many items come into play here. There are lots of sensors that work together and when one goes out it causes other sensors to throw codes.
First off, the actual cel (check engine light) code would be extremely helpful it will be Pxxxx
Other than that, a general troubleshooting guide would be to check your gascap.
Remove the gascap, check for cracks in the rubber seal
Check for dents etc on the gas filler neck which would prevent a good seal
Reinstall the gascap ensuring it clicks a minimum of 3 clicks
If this is your problem, your code should go away in a few days. If you find problems with the gascap or filler neck, etc. then go ahead and repair them. This is the most common cause of evap issues.
The other issue i have seen with the evap system on a '01 blazer is the pressure sensor on the fuel pump going bad. Good news is that this part is roughly $40 dollars. Bad news is you may have to drop the fuel tank to get to it since it's mounted on the fuel pump most of the time, and the fuel pump is on the top middle(ish) of the fuel tank. I don't recommend dropping the fuel tank full. It'll weigh a lot. (28 gal x 6.1 lbs) + tank ~75 lbs.
Hi. Error code P0353 tells you that ignition signal coil 3 primay/scondary circuit is malfunctioning. There are thing to be checked to clear this code. I provided you a link for this.
Error Code P0456 is a diagnostic trouble code pertaining to leaks in the vehicles
fuel vapor management system. The code is often set by failure to
properly seal the gas cap after filling the tank, or from leaving the
engine running while filling up at the gas station. The code can also
be caused by a damaged fuel vapor line, a bad seal in the evaporative
emissions system, a leak at the purge valve or a leak in the vapor
canister. After you have determined the cause of failure and corrected
it, you can clear the code out.
The fact that the light came on has nothing to do with filling your tank. The light is pre-programmed to come on following a combination of time, mileage and on some makes the usage profile, and it's telling you to get the engine serviced soon. After the service, the vehicle will need to be connected to a suitably-equipped computer to have the service light indicator reset. If you check in your Cadillac owners' handbook, the service section will give you details of which service items need to be attended to at the age and mileage of your vehicle. If it's just a simple oil and filters service then you may decide that you can do this yourself easily and save money. If there's more to the job, you can decide what you're comfortable doing yourself and then get a garage to do the rest: the less you leave to the garage, the lower the bill.
Ignoring the light will simply mean that your engine eventually has a breakdown which can be extremely expensive.
EVAP Emission Control System - Small Leak Detected (1.0 mm). This code can be set when 1. fuel filler cap is not completely tight, 2. when various hoses get punctured or the canister close valve does not seal completely, 3. there is an actual leak in the charcoal canister, fuel tank, or other EVAP system component, 4. if any one of these components are malfunction (a), fuel tank pressure sensor, (b) purge control solenoid valve, (c) canister close valve, or (d) fuel cap. An engine vacuum leak would not set this code. Solution: Take the vehicle to a Hyundai Dealership for proper diagnosis/repair.