Hey guys and gals. I just changed my spark plugs today. I used E3 brand spark plugs. I have a 2003 Chevy blazer. The Blazer runs great, but now the service engine soon light is on. Anyone know why or how I could fix this problem?

You will have to have your codes scanned to see what has turned the light on . It can be one of many things. Oh yeh...If you filled up with gas recently...check to be sure your cap is on properly... if its not...this can turn the light on also.

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Hi, I work with E3 and happened to come across this bulletin and thought I would throw in my two cents...E3 improves combustion and sometimes the computer takes some time to figure out what has changed. Unless you are having noticeable problems with the car, I would suggest driving through a tank of gas and see if the light goes away. Also as "Henry Highrise" said, the gas cap being loose is often the cause for the light...Good Luck.

The E3 plugs will fire with a diffrent resistance value than a normal plug, computers might not like that and therefor throw a code for the ignition system. I do not belive that ANY spark plug create so much better combustion that it causes off readings with the 02 sensors, that is the only way the computer can sense better combustion, and it's a long shot at best..


check the codes, if it's anything ignition related, the plugs are to fault

service engine soon light is not the same as a check engine light.

IIRC you turn the key ON but dont start the motor.....then press the gas pedal to the floor slowly a few times then turn the key OFF and back ON.

Been a while sense Iv serviced a chevy and needed to reset the light.

Call your local shop or dealer for the correct procedure.

The service engine soon is not the maintenance required light you are referring to. The computer will turn this on when it senses any problem that will melt the catalytic converter down. Recent case in point was a Toyota Tundra truck with new spark plugs installed. It came on immediately after start-up and was running with a miss-fire on multiple cylinders. The problem was Auto-lite double platinum spark plugs in a vehicle that requires Iridium plugs. To reset this light you have to disconnect the battery for 5-10 minutes, or use a scan tool to clear the codes and reset the adaptive memory and monitors to factory default.

All cars are different in this respect. More importantly, if there are stored codes, OBDII systems will NOT clear the codes by disconnecting the battery. They are stored in non-volatile memory. Some of these codes will reset themselves over a number of start-stop cycles if the problem was intermittent. You need to 1) read the factory manual to understand what system you have and 2) get a scan tool to see what code was set.

My bad...(brain fart....it was late)

I'm not failure with "E3" brand plugs but I'd say they are the crap that walmart sells off the shelf.

An 03 Blazer calls for a DOUBLE platinum plug, and without them your probly throwing the random multiple missfire code (PO300) Or a cyl mis fire (PO301-306)

All I know about E3 plugs is that they have 3 electrodes..

ANY plug with more than 1 negative electrode is a waste of good metal IMO

the spark is going to jump to the shortest gap FIRST the others are useless.

just something to think about during the process of changing the plugs you may have unplugged something that didnt get plugged back up. just make a quick check of all the engine harness connectors and make sure everything is tight.although the best way to find out what it is is to have it scanned then you will know exactly what is wrong, good luck.

I have to agree. I worked on a 94 Mitsubishi 3000GT SL that barely passed smog. It's readings pointed to spark miss fire. It had plugs with 4 ground electrodes, which I changed to Iridiums and it cleaned right up.

I agree, there is no advantage to multiple electrodes

amazing how much people DON'T know and think they do...
so far joe, you're the only one that has a grasp of late model stuff...
btw, i HAVE run into a couple of cars that will dump the codes by disconnecting the batt BUT they ain't domestic...

camarolover could be right also, but my guess is that you cracked a plug or got a bad one (it happens)

my suggestion would be get it scanned and go from there...

..and if this were the HAMB, i could phrase this the way it should be......
THAT'S THE BIGGEST BUNCH OF BS I'VE HEARD IN A LONG TIME!!!!
the 'puter does NOT have to "relearn"a different set of plugs!
a tank of black gold ain't gonna change anything.
i hope you are not an engineer for e3 (btw, never heard of 'em but it sounds like the old splitfire crap to me)

want someting to run like crap?
bosch platinums or splitfires will do it for ya...



all that being said, if you filled up with the engine running or left the cap loose, it'll turn on the light BUT so will a 100 other things.
get the codes pulled before you do anything else...