Do you have open exhaust close to the o2 sensors?
Do you have open exhaust close to the o2 sensors?
No they have give or take 5 ft of 2.5 inch stainless after each sensor. No leaks that I?m aware of and if it?s a leak there?s not way it?s more than a pinhole. That being said, could a pinhole leak even cause that big of spike in STFTs? Could the 02s be fouled but having too much soot on them?
Try unplugging the O2 sensors and see what it does staying in open loop.
Will do
You can also keep it in open loop by setting the close loop enable temp to 284 in the calibration if you think you can do that instead of unplugging the O2 sensors. Either one will do it. You should do a fuel trim reset with the scanner too before running it.
If this lets it idle without wack ass fuel trims which would most likely make it not backfire. Should I go ahead and try to take it down the road to get some logs with load on the engine? The truck is legal, safe etc.
Also, what does the fact that the MAF is reading so much air have in effect to this?
Last edited by Iwanski; 4 Weeks Ago at 03:13 PM.
Unable to look at your log. What is the MAF showing in Hz at idle?
Is anyone going to notice how the idle is coming up to 30* advance, and how TPS isn't 0%, and how the Min TPS for base spark is 1.19%? Is anyone also aware of what effect this has on the exhaust stream that the O2's are reading?
Yes. Should be around 2600-2700 Hz at idle. It is a stock 02 LM7 MAF? AC Delco or Delphi and not some auto parts store brand?
Last edited by Iwanski; 4 Weeks Ago at 08:57 PM.
And the airflow arrow is pointing the right way?
I mean, I like to think I'm smarter than that but I will check next chance I get in case it is something stupid like that
It's probably installed correct as the screen kind of makes it obvious which way it goes. Even if backwards it wouldn't double the Hz output at idle. Do you have another one to try just for the hell of it. In all my 21 years of doing this and hundreds of swap vehicles I've never seen a MAF output anywhere close to 4500 HZ at idle. Even if the MAF table was bonkers it wouldn't change the HZ output, Just the airflow for that HZ output.
I haven’t been able to get my hands on a MAF besides just buying one yet. But I’ve been looking around and started coming up with some questions.
First of all, on my S10s gauge cluster display, it must have been in Drive when I uninstalled the thing in the side of a 4l60e as the D is highlighted showing it’s in gear. Could the PCM be reading this through the serial data line and believing it is in gear instead of Park or neutral causing a wack idle as it would be going off every In-Gear parameter at cold temps instead of the P/N inputs? Could this be why the MAF readings are so high, as it thinks it’s in gear and without a vss yet?
Second of all, I ordered a Dolphin Digital VSS pulse generator as I’d like to see my speed w/o an iPad in front of me. Could the lack of VSS be causing anything? And could P/N and In-Gear be set to go off speed parameter instead of gear? Like it “changes into gear” after 1-2 mph? This is with a TH350 still.
Last edited by Iwanski; 4 Weeks Ago at 07:48 PM.
I relocated my MAF to the bottom junk drawer in my toolbox. Works much better now.
GM Gen4 Injectors v2.1.xls
Snow Crash was meant to be a warning, not a roadmap, you smooth-brained morons.
I don’t have a WB yet, but when I do is it possible without a dyno and with limited knowledge to do SD?
VE has to be tuned whether the MAF is going to be used or not.
GM Gen4 Injectors v2.1.xls
Snow Crash was meant to be a warning, not a roadmap, you smooth-brained morons.
I already told you how to get some progress with this, but no let's fuck around with the O2 sensors cuz reasons.
Set it to SD. The VE table will reveal fueling problems with much higher resolution than the MAF. Make sure TPS voltage is in the proper range then perform a reset. It's not even using the idle table. If there are still problems then you've ruled out a fair amount.