So like the title says. Car is an LS1 Corvette. Car came in running very rich but no codes and nothing else wrong with it. We installed the A&A supercharger and the car was running very rich still. We pulled fuel by the MAF airflow table several times and it still doing the same thing. We pull anywhere between 10-15% at a time and the idle is sitting around 11 afr. Up top it doesn't seem to bad but the car doesn't seem to be making the power it needs to either. Any ideas?
Quick look at the log shows the oxygen sensors arent too active.
And is the wideband calibrated? Shows really rich but the LTFTs are showing really lean.
IF it were me, id put a 2 bar map in it and do a speed density tune to sort out the VE table and then do a MAF calibration. Then see how it runs.
Something does look wrong with the narrow bands tho.
Idling in the 11s and the LTFTs and O2's aren't agreeing. Only at 2 points do i see the O2s at 450mv and the afr in the 14s
what i'm seeing in that log, you better get your wideband checked, everything 'm seeing is your crazy lean, both o2's are agreeing, which tells me your burning the wrong end of the candle. its not making any power because your not giving it any fuel. the ecm is telling you it wants fuel, and your taking it out.
I calibrated the O2 sensor right before that and the burn smells super rich. Do you think the o2s could be trashed? The car was running that way when it came in but there isn't any codes popping up. Every time I start it as soon as the ltft start to register it goes right to -18.
I have another wide band laying around I'll swap that in just to see if there is a difference but the car keeps going rich.
I would try another wideband along with maybe starting over from a factory tune and see how idle does. IF the wideband and narrow band sensors agree then you should be moving in the right direction.
Anyone have a stock tune for a 99? I think someone messed with this one
Check the HPT repository.
Go to your account and should see the repository once you confirm your HPT interface?
https://www.hptuners.com/my-account/
Cool. I never knew about that. So the stock file wasn't messed with really. A few minor differences. I'll try that new wide band now
So I changed the wide band and calibrated it. Still running rich. I feel like this car is messing with me at this point. The idle consistently is rich around 11 afr. I pull out 15% at a time from the maf it's still the same idle. On the top end it seems like it'll be rich by 10-15% so I update it and then it's lean by 10-15% and keeps bouncing back and forth. The LTFT seem to do the same thing were they are either at 18% or they sit on another number. I hoping I don't need to change them (the headers might need to be removed) but it's looking that way.
Can you confirm the injector data?
Yeah FIC 60lb injectors Copied and pasted all the data. It was running rich before we put the blower on too. I didn't think to much of it at the time since there were no codes on the dash. I just figured it was the tune.
So changed the O2 sensors...they were caked black. Start it up and it's still jumps right to 11 afr. It came up to around 12 after it warmed up a bit and when the new o2s came on line they just went straight to -18% on the ltft. So it has to be mechanical right? The injectors are new and the data is good. The car was doing this before the install so I don't think it has anything to do with the supercharger.
Checked the fuel pressure and it was started at 60 and crept up to around 61-62 psi. Can 3-4 psi be my problem? We pulled 10-15% out of the idle cells like 10 times at least. I would think the afr would have come up at least some but it always kind of defaults to the same place.
3-4pai isn’t the problem.. didn’t look but probably Injector MS limit is in the tune
I checked and the injector data all looks good. They didn't give us any pulse corrections though. Could that make a difference?
I changed the limts, offset and Flowrate
Has anyone ever heard of Component Protection causing an issue? It has a Eq ratio that it adjusts the air fuel ratio like being in PE mode. I'm guessing if this was kicking in it would show up on my commanded a/f ratio pid?
Did you change fuel min under the transient tab? If not then that’s your problem..
Yeah, just started it again and the fuel pressure was bouncing all over the place. 50-70 psi. I wonder if the regulator has an issue. The pump is brand new.