04 burb stalls while stopping

[Shatcher0428]

Hey guys I have an 04 suburban and am completely puzzled. Occasionally during the week whenever I come to a complete stop the idle drops and it dies. It will immediately start back up but if I do not hit the gas will die again. It will even do it in neutral. Now in park it will remain running. This does it randomly and when I am driving 80% of time it runs great zero stalling. Engine has been rebuilt, new crank sensor and cam sensor, recently changed the coolant temp sensor due to failure and replaced pigtail at same time. After installation of new temp sensor is when I really started to noticed the stalling issue. Only engine code is Evap code. Any help would be great! Thanks!

 

[Fless]

Welcome to TYF.

A vacuum leak could cause a stall at low idle, also has the throttle body been cleaned lately? Is the IAC on the throttle body working correctly?

 

[Doubeleive]

pick up a fuel pressure tester (they are cheap) and monitor your fuel pressure

 

[PNWYukon]

Try to get some live data of the event, that will help narrow it down.

 

[RED TAHOE LS]

When was the fuel filter changed ?

 

[Shatcher0428]

I replaced throttle position sensor about 2 years ago, along with fuel pump, filter and regulator. Also has new mass air sensor. It is a flex fuel engine if that makes a difference. I didn’t think the 04 burn flex had an iac?

 

[PNWYukon]

What is the EVAP code number?

 

[Shatcher0428]

Do you know anything about the throttle control actuator? Could it be the culprit? I am thinking about replacing throttle body and getting new tca, the only code I am getting is a p0455

 

[PNWYukon]

P0455: Cracks, holes, or splits in EVAP hoses are typically the issue. Could be other things though. The EVAP issue should not cause your dying problems.

It's a 2004, then by all means change out the old parts, but without narrowing it down with some live data or a higher level scan tool, it will be a crap shoot.

P0455 Code: Large EVAP Leak (Causes and How to Fix) - Spire Car

Car Maintenance, General Repair, Trouble Shooting, and Everything Car Related

spirecar.com

 

[Doubeleive]

just because the fuel pump is only 2 years old doesn't rule it out.....it's one of the 1st things you want to check before just throwing money at it.

 

[Shatcher0428]

Thanks everyone gives me some ideas to look at, on the fuel pump wouldn’t it do it more than randomly stalling? It cranks right back up immediately whenever it does.

 

[Fless]

Thanks everyone gives me some ideas to look at, on the fuel pump wouldn’t it do it more than randomly stalling? It cranks right back up immediately whenever it does.

Maybe, maybe not. Only way to rule it out is to document the pressure at the time of the stall. Easy enough to do with a rented fuel pressure gauge from your local auto parts store.

 

[Shatcher0428]

Will do thank you!

 

[S33k3r]

Will do thank you!

Did you ever figure this out? 'Cause I now have that same code...

 

[Fless]

Did you ever figure this out? 'Cause I now have that same code...

 

[Shatcher0428]

I did several things, one was I had replaced the battery with one that has 800cc, also had been throwing a flex fuel sensor code so I fixed that and lastly replaced the fuel pressure regulator. It made a huge difference changing the regulator. I was hesitant about replacing because I had just replaced it 2 years ago but whenever I went to swap it out I noticed it had a bad o ring so it was sealing properly

 

[S33k3r]

Thanks, y'all. My Suburban 1500 is throwing a P0455 code, and I don't have a smoke machine. :-( My biggest fear is having to replace the fuel pump "module".

 

[Shatcher0428]

Hey update on the stalling, I ended up replacing the fuel pressure regulator again and whenever I inspected it I notice a Oring did not seat properly causing loss of fuel pressure. I also replaced the flex fuel sensor with a dummy one. I do not use E85 nor will I. so that being said the burb is running a lot better. Thanks for everyone's help!