Starting and staying running issues!!

[stormtrooper777]

Tell us what you're working on -- year, make, model, and engine. Then start with some basic tests, like fuel pressure, spark, etc.

2007 tahoe lt 5.3. Like i stated in my original post ive gone through all steps and replaced most sensors. Have fuel pressure, spark and air just won't stay running

 

[stormtrooper777]

Welcome from SoCal. Sounds like you got the hard part done. Do you have something like a tech 2 to interact with the truck?

Of course but he is sick and can't make it anytime soon. And I need this fixed like last week. Haha

 

[stormtrooper777]

Need more specifics on what you did. Were you looking to delete the AFM/DOD.... Or are you only replacing the AFM lifters?

Note.... It's not usually the AFM lifters that fail, it's usually the solenoids that control them. As much as I cringe at the thought of attempting to maintain the AFM system, to do it correctly you should replace the VLOM after removing it.

Reading whatever trouble codes exist is where to start.

I am not looking to delete afm. I just wanted to replace lifters so I didn't have to down the road. I've owned 8 tahoes and suburban with ls 5.3 and never have ran into this ever.

 

[stormtrooper777]

Tell us what you're working on -- year, make, model, and engine. Then start with some basic tests, like fuel pressure, spark, etc.

Ive done the basic tests 3 times

 

[petethepug]

Not a gas monkey tech 2 diagnose, a tech2

 

[j91z28d1]

I'm so confused by this thread. can you get a video of this happening?

and did you put new afm lifters in, or non afm lifters? if afm, where did they come from. I've seen so many posts of guys having to go back in a 2nd time because they used Amazon or ebay afm lifters and it wouldn't run right. oem or millings only.


video would help, but if you're saying after it starts, revs up and dies, the starter can't spin the engine over anymore. unless you have a bad connection to the starter, that sounds like it's running so rich it's flooding, stalling out and dying. then it's hydro locked with so much fuel the starter can't spin the engine over? I didn't even know this was possible lol.

after it dies pull the plugs and look for raw fuel. byond that you're going to need a decent scanner and know what you're looking for. I don't know what basic tests are you're doing over and over or what sensors you've replaced(there's a lot of them) but they don't seem to be giving any info that you can share with us?