Chevy 5.7L TBI Code 44 Hesitation Problems

[midog]

I have a 5.7L Chevy TBI. Ran great in Moab for its first time out! After I came home I’m having some issues.

The check engine light came on 44 code (O2 sensor detects lean fuel condition). When I warm it up and then go to wide open throttle is bogs down and hesitates for a few seconds and then catches up.

My fuel pump is rated at 30-45 psi and I wonder if that is causing some strain or damage to the internal fuel pressure regulator in the TBI? I’m also wondering if maybe a sensor could be the problem (like the throttle position sensor).

Any on with similar issues and what to look for before I spend a bunch of money on parts that I may not need?

 

[mbryson]

I'm running the stock YJ 4.0L fuel pump with my TBI. I think it runs at 45-60 psi? I have not had any issues with the pressure regulator.

I'm not sure what could be causing your condition though.

 

[Bart]

It could be a bad 02 sensor that's triggering too much gas. I had a TPS go bad on a Jeep and it would do some funky stuff like that when it got hot, but that was a TJ 4.0.

 

[cheepin]

Why are you guys running so much pressure?The stock chevy pump is only 26psi.I had too big a pump on my rig and it ran terrible.Over powering the TBI's regulator.I changed over to the stock chevy in tank pump and it runs great.

 

[mbryson]

Why are you guys running so much pressure?The stock chevy pump is only 26psi.I had too big a pump on my rig and it ran terrible.Over powering the TBI's regulator.I changed over to the stock chevy in tank pump and it runs great.

Honestly, I was just using it until I figured out how to swap to the in tank Camaro or truck pump or something. It's been in there about six years now. No issues at all

 

[Justin Lake]

I put in the Carter GP5001 inline pump for my TBI 350 and it works great. It runs at 20 psi. max and has a 50 GPH. flow rate

 

[midog]

Good ideas on the pump pressure. I have been worried about that as well. I know the pump I have is rated to 30-45 psi. I'm in the process of getting a fuel pressure gauge to actually see what kind of pressure im getting. I will let you know what I find. I kind of hope thats the issue (easy to swap out a pump).

Thanks guys!

 

[midog]

I put in the Carter GP5001 inline pump for my TBI 350 and it works great. It runs at 20 psi. max and has a 50 GPH. flow rate

Did you use that pump from the start? or did you have issues and swap in the carter.

I have been looking at a walbro 395 pump (another low pressure pump) but its a bit cheeper.