My truck will not stay started . I can crank it an it will run for about 30 seconds an it shuts off . My AFR goes very lean when I crank it, the idle is very rough . Ive attached a file below of whats its doing, any suggestions????
2002 L59 Tahoe BAD IDLE Plz help!!
My truck will not stay started . I can crank it an it will run for about 30 seconds an it shuts off . My AFR goes very lean when I crank it, the idle is very rough . Ive attached a file below of whats its doing, any suggestions????
Last edited by Collin Smith; 06-08-2023 at 04:15 PM.
Is this a stock vehicle?
VERY little info to go on. Can't open your log. I am running older software.
1. Did it ever run correctly?
2. If it did, did it have any work done between it running correctly and now?
3. Fuel pressure. Check it.
4, Codes. Check it.
5. Cranking rhythm. Is it good? If bad do a compression test.
6. Vacuum leaks. Can you hear a vacuum leak when it is idling?
7. Disconnect MAF and see if it will run.
Report back and we can go from there.
Its a 5.3 liter Tahoe its cammed , longtubes , no cats Y pipe ,102mm intake manifold , rebuilt transmission
Last edited by Collin Smith; 06-08-2023 at 06:48 PM.
yes it used to run GREAT im trying to get it back to that. i just disconnected the MAF an it does stay running no vacuum leaks that i can hear
I checked his other post. He was previously running decapped Injectors.
Make sure you don't have any false air (Air that enters between the MAF and the throttle body). If it's all good looks like it is either your MAF tables being wrong or not adjusted correctly or just a plain old bad MAF.Originally Posted by Collin Smith
Dm sent, What are you mods?
This is also another log ive taken today it stayed started but i had to stay on the gas to keep it going without me keeping it started then it dies
Why did you change your injector flow from 40 to 33? Did you change injectors? Just saw you are running decaps. If you are than literally no one can help you.
Pretty much.
what do you mean no one can help me? so there were decapped injectors put into the truck and instantly swapped back to stock flexfuel 33lb injectors. by the way the last log was incorrect in alot of was. so i unplugged the maf and it stayed running put a new maf sensor truck still died so ive followed the harness back to 5 burnt wires.
So you have the stock oem injectors for that motor/ECM in the truck? Or these are some other 33lb flex fuel?
yes stocks back in
Did you put all of the injector data back in the file from the original file?
google russk idle and start there.
come back when you get through the steps
yes all original data was corrected and uploaded... I cant keep my truck running long enough to get any data
if you have decapped injectors, do yourself a favor and put stock ones on.
What are your mods that you feel the need to use decapped injectors ?
ahhhh i found my last comment on your previous post
"ok, so you need to make sure the vehicle has an exhaust setup to ensure we are getting proper information. Also recommend putting stock injectors on there for now. the log will tell us if you need more injector or not.
once you have done this i would suggest submitting another log and hpt file on here."
did you take care of the exhaust and put stock injectors?
yes took care of it. im about to fire it up will have a log shortly.
The decaped injectors were for the turbo but that will be delayed
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