5.3 Turbo Silverado Start up
05-12-2017, 10:33 PM
#11
Ye olde throttle position rationality diagnostic... There will be a surface in the engine airflow diagnostics that displays a maximum expected cylinder air mass. Max this surface out to disable the check. That will fix your problem, but really you shouldn't be having that fault occur at idle. That tells me your fueling calibration is off because you're telling the engine it's getting more air than it really is to pump in enough fuel to hit a target AFR.
05-13-2017, 08:05 AM
#13
I have double checked all the plugs. The MAF is cut and rewired for my IAC sensor. I used the black wire and tan wire from the MAF plug and wired those two wires to the IAC sensor. Is there something I need to change for this sensor install?
05-13-2017, 08:16 AM
#14
05-13-2017, 10:07 AM
#17
Actually I was only thinking about part of the problem. You'll want to ramp up those values in the surface on the right at ~30% throttle and higher to a value greater than whatever your target boost is. Most people will just max out the entire thing, but it can be very useful to maintain some diagnostics with your mods.
05-16-2017, 08:06 PM
#18
Truck doesn't throw anymore codes and doesn't shut off on "Reduced Engine Power". Those changes that you had me do smokeshow helped! Has a pretty crips throttle response but doesn't idle good at all have to stay into the gas for it to keep running and let off the throttle and it will die. I am completely new to tuning and any advice on what direction I need to go next would be awesome. Thanks guys!
05-17-2017, 04:55 PM
#19
If you want to continue to run in SD mode:
1. Bump up the idle. Something like 700 to see if it idles better.
2. Your VE table looks damn near stock. That's contributing to the problem. Add 10% to your VE (400-1200 range and up to 100kpa). Keep adding 10% until it idles.
These 2 things should get you a good idle. If you're having to feather the throttle to keep it running, it's wanting more fuel.
1. Bump up the idle. Something like 700 to see if it idles better.
2. Your VE table looks damn near stock. That's contributing to the problem. Add 10% to your VE (400-1200 range and up to 100kpa). Keep adding 10% until it idles.
These 2 things should get you a good idle. If you're having to feather the throttle to keep it running, it's wanting more fuel.
