Help Needed. Trouble codes, bucking, misfires.

[Chance77]

Ok, i am in a little need of help tracking down an issue. I am getting trouble codes forst and foremost u0100. But along with this code, i am gettin p0300. I have inspected my intake,hoses,vacuum line visually, found no damage, and rubber all is still pliable. I am at just about 70000 miles
I changed the plugs to ngk dx approx 12000 miles ago, full synthetic every 5000 mi, injen cai, is only mod under the hood. Was running great up until last couple weeks. When im getting on throttle id rarely stumbles, but cruising along at speed limit in any gear, hessitation and misfires. Side note, when i changed my plugs, the drivers side plug was noticably more worn, showing signs of being burned up and greyed. Im just unsure if i possibly should remove the injen cai, replace the maf, replace coil packs, or is it something im missing or something any of you have dealt with?
Any input, suggestons, or experience would be greatly appreciated.

 

[flatlander937]

Sounds like an ignition related problem. Likely a bad coil pack.


Out of curiosity, try unplugging the MAF sensor, this will force it to run in open loop. See if it still stumbles the same.

The U100 Is a communication code. Sometimes those will set if other modules rely on data from other modules, I wouldn't worry too much as it is likely caused by the misfire.


Clear the codes and keep driving it. If you're lucky you'll get a specific cylinder misfire code to start there.


Does it idle fine?

Plugs were my problem at 50k, but you already changed them... Did you gap them/verify gap? Inspect the porcelain for cracks? You didn't drop any plugs before install did you?


Google carbon tracking on spark plugs and coils. Inspect plugs and coils for traces of arcing through causing the misfires.

 

[Chance77]

Thank you flatlander. Issue resolved for now.

 

[flatlander937]

What kind of update was that? lol!

What was the fix/problem?

 

[Chance77]

I dont know what it was, i redid everything, i fear it was a loose wire as i assembled remove and assembled numerous times, after the third time i was about to give up, and it vanished, may have or could be a loose wire somewhere, and that is probably the first thing i will look into if it comes back.
The MAF was dirty, almost green and fuzzy near plastic and sensor, so that may have been big contributer, but it did not fully go away after cleaned and dried for about 30 minutes.
When reconnecting everything, i did have a mess from where the aftrmarket cai is installed, re arranged all that, seems to have corrected, that was wires though, not vaccum lines

What kind of update was that? lol!

What was the fix/problem?