Help finding part

[b58.brady1]

I’ve been sometimes having a studder on startup on my b58tu. I sent some datalogs to chat gpt and everything is pointing to my evap purge valve going bad, but when i look it up the only thing i find is fuel tank breather valve, is this the same thing? if not, can someone help me find what i need to replacd

[ShocknAwe]

Originally Posted by b58.brady1

I’ve been sometimes having a studder on startup on my b58tu. I sent some datalogs to chat gpt and everything is pointing to my evap purge valve going bad, but when i look it up the only thing i find is fuel tank breather valve, is this the same thing? if not, can someone help me find what i need to replacd

Typically the fuel tank breather which is usually attached to induction/charge system and then there's the charcoal canister in the back.

Stutter on startup can be air leaks or, I'd be more suspicious for, an injector leak which is being overcompensated for to smooth the lambda. Example here is one is leaking so the others run too lean giving you both a hyper rich cylinder and lean cylinders. Bad combo and hard to tease out until it's really severe. In this case the leaking injector can be very slight leaving fuel in the chamber on startup and a lumpy crank/idle until it warms up. Nice thing here is the injectors can be tested on bench for leaks and doesn't require any parts to diagnose..

I'm not sure AI analysis is your best bet here. An untrained chatbot is as useless than a bag of rocks IMO. Actually no, a bag of rocks is more useful, I can think of several things I'd like a bag of rocks for.

Easiest thing for you to do NOW is just buy a roll of vacuum tubing and replace it all. Then go from there.

[b58.brady1]

Originally Posted by ShocknAwe

Typically the fuel tank breather which is usually attached to induction/charge system and then there's the charcoal canister in the back.

Stutter on startup can be air leaks or, I'd be more suspicious for, an injector leak which is being overcompensated for to smooth the lambda. Example here is one is leaking so the others run too lean giving you both a hyper rich cylinder and lean cylinders. Bad combo and hard to tease out until it's really severe. In this case the leaking injector can be very slight leaving fuel in the chamber on startup and a lumpy crank/idle until it warms up. Nice thing here is the injectors can be tested on bench for leaks and doesn't require any parts to diagnose..

I'm not sure AI analysis is your best bet here. An untrained chatbot is as useless than a bag of rocks IMO. Actually no, a bag of rocks is more useful, I can think of several things I'd like a bag of rocks for.

Easiest thing for you to do NOW is just buy a roll of vacuum tubing and replace it all. Then go from there.

It ran me through 3 or 4 different datalogs, ruling things out each time. I know it’s obviously not the smartest but i also don’t want to go through a dealership