ok so I finally got my bluetooth obd2 adapter working with my laptop so I could get more detailed reading than my torque was giving me.
What I found is even with the 180 degree state it goes to a closed loop "normal" system state but what gets me is the #1 o2 sensor keeps fluctuating from a rich to lean state (.78 to 3.78% with the occasional fast drop to 0% every now and then?) is this fluctuation normal? also is 1.5psi itake manifold pressure at idle sound ok? it actually drops to 1.3psi while I hold the rpm's at 1,000 after a quick spike to like 2.5psi? the truck doesnt burn oil and I cant see an oil puddle on the plenum. The intake temp is at 141 degrees when the engine is fully warmed up at 180? this is with a cold air intake that isnt really sealed off from the engine compartment though.
I'm hoping someone out there has a better idea about what normal on these trucks than me.
Thanks

 

the o2's are in constant fluctuation.. If I'm not crazy, the reading it wants is 25.2.. it will jump above that and below that regularly, and fairly fast.. these are called cross counts, or where it crosses what it believes to be perfect a/f.. if it is 'crossing' 25.2 often, that is a good thing, as it means it's narrowed down on a really precise mix..

usually, when the cross counts slow is when you're having an issue with the sensor..

what brand of sensor is it? Bosch are known to be slower in responding than Densco or NTK/NGK's, which is the reason they suck for these trucks.. usually, when you see a momentary drop to zero, it is part of a built in test (BIT) and is functional for calibration and making sure the thing is working right..

the vacuum reading- I bet a dollar it isn't psi, but bars.. one bar is 14 psi.. this sounds right for a healthy engine.. it's doing what it's 'sposed to do.. if you blip the throttle on a healthy engine and watch even an analog vac gauge, it will drop rapidly, and then go lower than idle (more vacuum) and then settle.. you want to see it do this, and fast.. it indicates your piston rings aren't worn and your valve guides are still doing what valve guides are 'sposed to be doing..

the air intake temperature will fluctuate, obviously, with environment- but not so wildly with the keg and the stock IAT location.. 140 is good for an engine at 180.. with my IAT relocated, and the goodhood ram air hood through an insulated box- I have seen temps as low as 15* with ambient temps around 40* and at 60+ mph.... I also promptly saw a p1282, too, though.. colder is better..

 

I'm not sure of the brand... I dont see anywhere near 25.2 though? the one after the cat is pretty steady but this one fluctuates a bit... the one in the girlfriends impala really fluctuates like an EKG reading on the graph... mine does this slower when viewed in a graph form.

 

dang things usually aren't stamped with the make.. I bet it's a Bosch.. they report slow, and that is a fact with all bosch o2 sensors across the board..

 

from here

there is a 25.2 reading, but I don't know in what.. it may be some measurement of actual lambda, or some sort of resistance.. in voltage, it's what is quoted..

that page is a good read..

 

your getting less sample rates with the ISO protocol.....the less PID's you select to monitor the more samples you can retrieve......Is the G/F Impala 2008 or newer? using the CAN protocol? faster sample rate.....

 

No hers is a 2001... good to know... and its 11 kpa (or something to that effect) on intake pressure according to Torque... so if this is happening at 181 to 185 what would change at 195 degrees? it appeared to be looking for the right rang on mine...
also anyone know if one of these programs can tell me what revision programing is on the pcm so I can tell if I have the death flash?

 

Everything else is confusing me. I don't know anything about that, but if you have the "death flash" there should be a sticker on the ECU saying "software update".

 

lol....my head is spinning....but 11kPa = 1.59 psi from an online calculator that I googled...

not even sure my ScanXL pro can tell what software version the PCM's are....never really tried to find out either....on the to do list.

 

lol I read that before...normally I'd agree...but this truck is a Frankenstein special...its made up of at least three trucks as far as body panels and I'm still discovering performance mods from the previous owners ... for example I just confirmed it already has a magnflow cat. I half expect to pull a valve cover and find roller rockers... the guy I bought it from was a tool who beat the crap out of it... He didnt even know it had 4.56 gears installed.. It may even have a tune in it now for all I know... It had headers and such on it when I got it.