Working at the dealership I've never looked at timing while diagnosing misfires. Will an engine misfire change the spark advance without seeing knock count? Even if its not picked up as a misfire count on a tech2?

My lc-1 failed twice and ran like crap for a little bit so I pulled over and stuck the factory o2 back in. Now I've notice an intermittent hesitation while cruising. While logging I seen its pulling 14* timing about every 4 seconds with a dip. Is this a pcm response to the misfire/drag?

I even swapped back to my old map with Maf and still does the same thing. Plugs in it now are the old acdelco 41-985. Swapping to tr6 tomorrow.
Lq4/243/228r112lsa

 

Turn off your AC or heater motor and see if the problem continues.

 

That doesn't matter its the same either way. Gonna check fuel sample and change to TR6 plugs today.

 

I take back that previous statement. I havent logged it, but on the way to work today I thought about what you said and turned the a/c off and it seemed to make a huge difference and started running again like it use to. And throttle cracker follower working a lot better too. Guess its a load or a/c table causing it.

Edit: went and logged on my lunch break. Seems every time I engage the a/c its pulling 10*+ of timing. Assuming the a/c is low and its also cycling in and out on the highway tho it doesnt seem to have a cooling problem.

 

What tuning software are you using? I know you can adjust this with EFI Live, and I assume you can also do it with HPT.

 

Using Hptuners. Turns out its under Engine>Torque Management>Engine>AC Torque>Max Retard and just zero the entire table. Seemed to fix it so far.

 

Nice, glad to hear.