CEL issue

[Snakes709]

Ok so heres the story first. First got the truck 6 months ago with 81,000km on it. Dealership never had a record of the trucks maint. So i decided to changed plugs and all that. Upon changing the spark plugs i found that the plugs in the truck were, im guessing the ones that rolled out of the factory with the truck, the #2 was screwed. So i decided to try the new E3 plugs, JTSVP wires and coils. Since then never had a issue, ran the truck at the drag strip (no nitrous).

So about 2-3 weeks ago i brought my truck to a shop to get the 02 bung welded for my wideband. Guy that did it told me ill get a CEL. Sure enough a day later, a CEL came on. Figured it was just the sensor so i got lazy and just disconnected the battery (i know, might have been a wrong move)

So now we come to yesterday. As you recall in my other post its been the first time i went WOT since Aug 28 (due to me being away for 3 months with the army and coming back to snow). The wideband went from its flickering 14.6, went to 13.2, hesitated there for a second and then to 12.5. Which got me thinking it was lean but never though anything of it since it was 0*C out.

So today im driving to the mall, light on the throttle since its snowing, next thing you know CEL comes on. Thought it was just the same code for the wideband but something was telling me it wasnt. Stopped at a dealership got them to check it.

PO309 (#9 misfire)
P0300 (multiple misfires)
P0304 (#4 misfire)
P0309 (#9 misfire)

My guess is its the plugs, which would explain why it went lean yesterday. Ever since i had the plugs i heard bad things about them, but never expeirenced bad things myself so i kept them.

Whats your guys thoughts on this? What plugs would you recommend for a nitrous set up? I'm thinking NGK 1 step colder, does anyone have a part number for that?

 

[Ironhead]

sounds like loose plug wires ,,,a wide band bung hole will throw no codes what so ever unless they removed a rear o2 ,,,you either have fouled plugs or your wires are not connecting good,,,12.5 at wot is perfect not lean ,,,anything over 13 to 13.5 is getting lean,,i have e3 in mine for about a year with no problem ,,,did you pull plugs and look at them ???plus if you have misfiring plugs it would go rich cause your not burning fuel in those cylinders

 

[Snakes709]

I checked all the wires, they are all good in the plugs, cant get to the end that goes to the coils though but when i installed it i made sure they were all good.

 

[Ironhead]

i have stinkos wires and coils and e3 plugs ,,,pull plugs and look at them ,,thats the easiest and first thing to look at if thats not it then you will have to look at the coil side of plug wires

 

[Snakes709]

Could there be any other reason besides plugs or wires that its misfiring?

 

[Ironhead]

no compression in cylinder,thats withno problem with wires coil or plugs ,,,pull plugs ,,and look at them first,with plugs out crank motor over and make sure you have compression,,,some of the wires take a tight bend under the intake ,,,may have worked loose also

 

[Snakes709]

I just went out, dispite a blizzard is coming and checked the #4 plug, it looks ok, checked all the wires to see if thy were connected, everything looks fine. I'm gonna swap them out anyways, keep hearing bad things about the plugs.

If the AFR was lean, could it cause a misfire? Maybe im looking at this the wrong way. I'm thinking the plug misfiring caused it to be lean, maybe it being lean caused the misfire.

 

[Ironhead]

I just went out, dispite a blizzard is coming and checked the #4 plug, it looks ok, checked all the wires to see if thy were connected, everything looks fine. I'm gonna swap them out anyways, keep hearing bad things about the plugs.

If the AFR was lean, could it cause a misfire? Maybe im looking at this the wrong way. I'm thinking the plug misfiring caused it to be lean, maybe it being lean caused the misfire.

being pig rich would foul plugs and screw up O2 sensor ,,too lean would trash your motor ,,,,i dont see you being to lean ,,,but ,you still need to crank motor over in them cylinders see if you lost compression ,,,do you have a compression tester

 

[Snakes709]

No, was looking at getting one tonight but decided not to get it. I just picked up 10 plugs. NGK Iridium ZFR6IX-11, was suppose to be $170 but got them for $107. Anyone have issues with these ones? I had NGK iridium 1 step colder in my car before and never had issues. Also what gap should i run them at?

 

[Da1Chief]

Possible clogged Cats, that would put back pressure and cause misfires, or am I thinking wrong ?????

 

[ZCx]

with Stinkers coils & Denso iridium plugs, i set them at .045

stock is.035 i believe

 

[Ironhead]

Possible clogged Cats, that would put back pressure and cause misfires, or am I thinking wrong ?????

yes it would but it would also be a slow power robbing thing ,,i never seen one say over night get clogged unless you had a bad tank of gas but it would run rough as hell then clog cats :dontknow:

 

[Snakes709]

Thanks ZCx, thats what i thought.

As for the cats. I wouldnt be able to tell you if the power felt weaker. Yesterday was my first time to go WOT since Aug 28th and i was only able to get from 70kmh - 110kmh and thats it. And since its been awhile since i felt the power so i dont recall what it feels like. Unless i would feel it through a different range of throttle positions. Unless the gas station had a bad patch, the only other way i could see bad gas is from my 1/4 i had sitting there for 3 months. But i been through over a dozen tanks since i been home.

 

[Ironhead]

compression check is in order then ,,look at it this way ,,it will eliminate a question, then you can look at the smaller picture ,,,

 

[Snakes709]

Yea im thinking that as well. I was thinking maybe the wire that runs to the coil was loose but #4 is on one pack and #9 is on the other.

 

[BLWNSRT]

Is it a constant misfire? If so take plug 9 and swap with 7 see if the misfire moves same with plug 4 swap with 2 see if it moves. If you need additional help let me know. It may be a faulty plug.

Pm sent

 

[Ironhead]

Is it a constant misfire? If so take plug 9 and swap with 7 see if the misfire moves same with plug 4 swap with 2 see if it moves. If you need additional help let me know. It may be a faulty plug.

Pm sent

thats why he bought a whole new set of plugs ,,,read down to the rest of thread :aetsch:

 

[BLWNSRT]

thats why he bought a whole new set of plugs ,,,read down to the rest of thread :aetsch:

It's been a long day and I'm trying to watch a hockey game :dontknow:

Ok then if you need a compression tester or cylinder leakdown tool let me know you can stop by and I could take a look.

 

[Snakes709]

I dont think its a constant issue, unless the first CEL didnt have anything to do with the open O2 bung and it was misfires. Is there any way i can find out that the issue is resolved when i change the plugs tomorrow, besides erasing the code and playing the waiting game to see if the CEL comes back?

 

[Ironhead]

i wonder if when they put that bung in if they damaged an o2 sensor :aetsch:,,,the bung should throw no codes ,,the widband is not hooked to the ecm ,,,did it throw an o2 code or just the misfire codes,,,i would clear codes install new plugs and try it again ,,its the cheapest way right now ,,if it throws the same codes again ,do the comperssion check