2G Won't idle after operating temp

[FilmerDude]

When I start my 2g it will turnover then "chug" really hard then continue starting then finally start. It idles cold but misfires slightly and exactly when I get to operating temp it won't idle at all it will die right away no matter what. I've been reading around many DSM forums but can't find a solution. Please help this is my daily and it's quite annoying.

 

[daniel91talon]

I'm not a expert but it could be a sensor. Is your engine light on?

 

[FilmerDude]

No lights at all

 

[daniel91talon]

I would still run the diagnostic test and check. If nothing there do a compression test. Your rings could expand or something when warmed up.

Remember. I am not a mechanic so I'm probably completely wrong. But that's just what I would do.

 

[FilmerDude]

I noticed my TPS and ISC is off so I'll be sure to fix that but now all 3 of my fuel trims are at 0% instead of 100%.

 

[daniel91talon]

Any luck?

 

[FilmerDude]

Not yet. Replacing O2 sensor once it gets here.

 

[daniel91talon]

Okay bud. Good luck.

 

[FilmerDude]

replaced o2 sensor and nothing. There was some chaos and frustration between it too. Almost want to sell the damn thing I'm so irritated with it. The only thing I can think of is that the maf is reading negative something air temp but its a GM maf so idk. All fuel trims are at 0%. I NEED SOME HELP BEFORE I SELL THIS

 

[Lester B]

Seems once you go into closed loop. So that would mean the car is adjusting based off of feedback from O2 and other sensors.

Is that correct it occurs once in closed loop?

You have a logger or ecm?

I think it needs to be up o 193 degrees to allow ft corrections.

Are you getting there?

Maf may be correct.

What's air per rev measure?

 

[FilmerDude]

Got a new O2 sensor and no change. Switched back to factory maf and now it misfires really bad at idle and will die if you try to give it throttle

 

[StevetotheH]

Possible idle air control valve.

 

[FilmerDude]

Nope checked it and it was good. Even took the one off my 1g that I knew that worked had same results