Fixes and.then maybe not!

[Livebai8]

Ok guys...need some help and knowledge...ive replaced my fuel sending Unit, the fuel pressure regulator, charcoal canister, and pcv valve...but not my fuel filter just yet ( I can't get the effing tool to work)... when cold, the truck idle seems to be fine...when at temp and giving it gas...the idle drops low and struggles to get back to 500 rpm...or dies...itll also die when going into gear. After driving it several miles the idle seems to be ok and the truck runs fine but in park it'll want to die after giving it gas...anyone know what's going on or what i should look into next?


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[Splorg]

Check your battery first. Is the truck charging hard when it's running properly? Does the gauge plummet when the idle is low, or just before the idle drops? Only takes a few minutes to rule it out - a weak battery or improper charging can cause havoc with the sensors the computer depends on to manage idle and air/fuel and can cause problems like you describe.

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[Fless]

What year, model, engine?

 

[Livebai8]

Check your battery first. Is the truck charging hard when it's running properly? Does the gauge plummet when the idle is low, or just before the idle drops? Only takes a few minutes to rule it out - a weak battery or improper charging can cause havoc with the sensors the computer depends on to manage idle and air/fuel and can cause problems like you describe.

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At start up idle...i can give it gas and it will plummet and either devout or creep back up to idle (500_700 when cd)...im not showing any codes either. My battery is from 2017. I'll have it tested.

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[Livebai8]

What year, model, engine?

2002 5.3l flex fuel z motor

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[Livebai8]

At start up idle...i can give it gas and it will plummet and either die out or creep back up to idle (500_700 when cd)...im not showing any codes either. My battery is from 2017. I'll have it tested.

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[swathdiver]

You'll want to know your fuel pressure, key on and while idling and then under load while underway.

 

[Livebai8]

You'll want to know your fuel pressure, key on and while idling and then under load while underway.

For sure . Doing that tomorrow. Thanks.

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[Sam Harris]

MAF...?

 

[Livebai8]

MAF...?

Don't think so. I 've cleaned it and sum not throwing any codes.

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