Bad idle, stutter/stumble on boost, close to stumped

[Spoolin92GSX]

I figured I'd post this in the newbie section since I feel like a newbie right now.. I've been slowly working out all the kinks on my car, but I'm just about out of ideas with this deal. I've narrowed it down to it only happening during closed loop - warm idle and part throttle acceleration/cruising.

New O2 sensor, known perfect MAF, fresh ECU from ECMTuning, new coolant temp sensor, ISC tests good, haven't been able to catch it acting up on a log yet. These are the ideas I'm down to - when I bought the car I had to replace the O2 housing and don't remember messing with gaskets (didn't know better at the time) so possible exhaust leak screwing the O2 sensor reading? Or, unrelated, possible fuel pressure solenoid acting up/not working properly, affecting fuel pressure?

When it acts up it smells incredibly rich so I'm fairly confident it's something between air being metered and the ECU's response to that, but the components themselves are known good so there must be something affecting their operation. Anybody help point me in the right direction, or suggestions of something I'm overlooking?

Mod list is up to date. Thanks!

 

[95talongirl]

What MAF sensor are you running? Stock? 2g? GM? You may have to run a MAFCompAdj. with DSMlink, if its anything other than stock. Witht he GM ones, you may find yourself manually adjusting it at the higher RPM range, as well.

 

[Spoolin92GSX]

Stock 1g MAF, pulled from a known running car with perfect idle. Properly "hacked" with only the lower honeycomb removed.

 

[My1GLaser]

Post a log!

 

[Spoolin92GSX]

Post a log!

As soon as I can catch it acting up on a log! I don't have Link (yet) so I could either post the TunerPro file or a screenshot of it..

 

[My1GLaser]

What plugs & gap are you running? How old?

 

[Spoolin92GSX]

What plugs & gap are you running? How old?

BR7ES (non-protruded insulator) gapped at. 028 brand spanking new, literally 2 days old. The issue is only during closed loop, if I hit WOT she runs perfect! And cold idle is fine too, only fully warmed idle and part throttle conditions.

 

[rEclipserGST]

Sounds like a TPS issue. Did you happen to move the sensor, throttle cable, or didn't recalibrate it period?

 

[Spoolin92GSX]

Sounds like a TPS issue. Did you happen to move the sensor, throttle cable, or didn't recalibrate it period?

I did adjust the throttle cable for slack a while back, made sure I left a little bit though. TunerPro logs perfect 10.20% at idle and I've tested the sensor with a DMM so I'm fairly confident it's not that.

 

[rEclipserGST]

I did adjust the throttle cable for slack a while back, made sure I left a little bit though. TunerPro logs perfect 10.20% at idle and I've tested the sensor with a DMM so I'm fairly confident it's not that.

Should be 0% at idle.

 

[Spoolin92GSX]

Should be 0% at idle.

Hmm. And that would affect part throttle driving too wouldn't it?

 

[sciondan]

Make sure your tps sensor is reading .5 volts with the throttle closed.

 

[rEclipserGST]

Hmm. And that would affect part throttle driving too wouldn't it?

Yes sir. It'll make deceleration unsubtle. Wideband should be affecting by this as well when you let off the throttle.

 

[Spoolin92GSX]

I'll double check the TPS volts.. Wideband is getting installed in a week or two, whenever the damn thing gets delivered..