Ok so I had all of my ignition coils go out..All four of them...I replaced those and my spark plugs and im getting these damn check engine codes for System too rich bank 1 and cylinder 2 misfire. The car has been running perfect for a while now with a AFR of 10.0-10.4 under WOT. I replace the plugs, just put some stock cold level ngk iridiums in untill the 2 stpes colder plugs get here. I dont have them gapped though. When the car sits at idle it kinda sputters and the AFR jumps up to 16 and the rpms drop but the car recovers and doesnt die. When driving the car, it runs perfect except when i floor it, it just doesnt wanna go it sputters and backfires and throws the system too rich code. I havent checked to see if a charge pipe is almost off and leaking or anything but any other clues?

What plugs is everyone running and did you gap them?

 

How did you possibly lose 4 coils at once? Sounds to me like there was a different issue. What led you to determine it was the coils?

 

CEL- Ignition Coil Circuit Malfunction, it would die at idle, and sputtered while driving. Replace coils, bam that problem solved. Problem first started when I blew a charge pipe off and had to sputter off the interstate.

 

Maybe gap is too big and you are getting spark blowout. Do you know what the gap is?? Is it stock gap??

 

First, never replace a part based off a code reading. The ECU only knows what looks out of spec, not why. A chain reaction of events (sometimes painfully pointing another direction) can make the ECU think there are other issues. For example, on my saturn, I recieved a Cam Sensor failre... there is not cam sensor on that year model. By understanding what the system used for that signal I solved the issue... replace #4 plug wire.

The reason I bring this up is that nothing I can see points to a reason the coils failed (if they really were bad), you still had an issue after replacing them, and the fact that I have never known of 4 coils going bad all at the same time.

Next, NEVER run plugs that are not gapped correctly. You need to get that taken care of first before going any further. Talk to Dezod about what they reccomend for plug heat rating and gap. An improperly gapped plug will cause all sorts of issues, including misfiring.

If you have a cylinder not firing, your 02 readings will be out of whack, so your afr will look funny.

Remove the plugs, gap them properly and replace. Then troubleshoot any other issue, if one is still present.

 

Yeah im running stock gap.

 

I would make the gap smaller. That should at least help a little bit and should defiantly not hurt anything (besides maybe gas mileage).

 

So what should they be gapped at?

 

Well if it helps, I use Denso IK24's gapped at .035.

 

Stock plugs are great. Just gap to .035

 

i got ngk iridiums 1 step colder, so i need to gap to .035?

 

Same gap should apply to the colder plugs. I would still ask for dezods reccomendation. Not that these guys are wrong, but Dezod did design your kit, so they would be the best source. From what I see they are more than willing to help and are usually available. I am still wondering what would cause your coils to all fail. If it were me I would put a little time into figuring this out so you dont have the same problem again.

 

Also if you have a boost/vac gauge, check to see if you're running 0 vac. If you are, check your injectors' o-rings. I've blown those before and finally replaced them with stiffer ones. Problem solved.

 

I work for a Toyota/Lexus/Scion Repair shop, All we use here
is Nippondenso Spark Plugs, nothing else... It is very rare that we have to gap a spk/plug. Always go with OEM original
equipment to start. If it is super charged, then you need to take it to a Shop who is qualified to work on such probs.

 

^^ Yep, I would NEVER replace denso's with anything else.. it is a downgrade to in my opinion. But, you can run NGK's too, I just think it is a drop in quality. If you run the stock plugs, you SHOULD not need to gap them, but you should always check to be sure they are gapped correctly before installing.