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Please Help - 5.3 Vortec Stumbling Under Acceleration.

jnettrecker

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jnettrecker Enthusiast

jnettrecker

Posted
Posted

I have a 2001 Suburban w/ a 5300 Vortec. Went out and started her and let it sit for +/- 10 minutes to warm up. When I left the house and pulled out onto the road the truck almost died. Couldn't get it over 30mph regardless of how I worked the throttle. Idles perfectly but nearly dies under any form of throttle. Doesn't matter if the truck is in gear or sitting in park......

 

Any suggestions on where to start trouble shooting. It has been a great truck, using AMSOIL we have reached 221,000 miles and still doesn't use any oil or have any tranny problems. I would love to keep it working a few more years. progress.gifedit.gif

dwhults Enthusiast

dwhults

Posted
Posted

Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

csheatz Senior Enthusiast

csheatz

Posted
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

 

+1

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

 

+1

 

+2

jnettrecker Enthusiast

jnettrecker

Posted
  • Author
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

Well I guess I will start there......lol. Sounds like the whole truck. I picked up a fuel filter and I will put that in regardless. In the past when fuel pumps have went bad on my they just quit......cold turkey. Has anyone had any experience with them going out gradually.

 

Also I do not have a fuel pressure gauge. Another way to check or do I need to shell out the $50?

csheatz Senior Enthusiast

csheatz

Posted
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

Well I guess I will start there......lol. Sounds like the whole truck. I picked up a fuel filter and I will put that in regardless. In the past when fuel pumps have went bad on my they just quit......cold turkey. Has anyone had any experience with them going out gradually.

 

Also I do not have a fuel pressure gauge. Another way to check or do I need to shell out the $50?

 

 

 

My fuel pump in our car just quit, nothing more. The fuel pump in our work truck did kind of what you are talking about. I would save that for last since you dont have the gauge. The others are all sensors or sensor related and are fairly easy to check and clean.

ShoddyHog Enthusiast

ShoddyHog

Posted
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

Well I guess I will start there......lol. Sounds like the whole truck. I picked up a fuel filter and I will put that in regardless. In the past when fuel pumps have went bad on my they just quit......cold turkey. Has anyone had any experience with them going out gradually.

 

Also I do not have a fuel pressure gauge. Another way to check or do I need to shell out the $50?

 

 

I wonder if AutoZone or O'Reilly's has a gage they loan out?

 

Gerry

dwhults Enthusiast

dwhults

Posted
Posted
Maybe a vacuum leak? How's the PCV valve? Air filter clean? Throttle body clean? IAC clean? MAF clean? Maybe clogged injectors. Fuel pump could be going, hows the pressure?

 

Well I guess I will start there......lol. Sounds like the whole truck. I picked up a fuel filter and I will put that in regardless. In the past when fuel pumps have went bad on my they just quit......cold turkey. Has anyone had any experience with them going out gradually.

 

Also I do not have a fuel pressure gauge. Another way to check or do I need to shell out the $50?

 

 

I wonder if AutoZone or O'Reilly's has a gage they loan out?

 

Gerry

 

 

I *think* they rent one out, not 100% sure. On my Jeep ZJ the fuel pump went out twice. First time it just died. Second time was gradual. Spitting out lower and lower pressure until it finally died. I would do the simple stuff and check what I said in addition to the fuel filter.

dwhults Enthusiast

dwhults

Posted
Posted

Also on my Jeep, one time I didn't clean my air filter for a while and it ran horribly. Could bare drive on the highway. Cleaned it and it ran fine.

Kawboy22 New Member

Kawboy22

Posted
Posted
I have a 2001 Suburban w/ a 5300 Vortec. Went out and started her and let it sit for +/- 10 minutes to warm up. When I left the house and pulled out onto the road the truck almost died. Couldn't get it over 30mph regardless of how I worked the throttle. Idles perfectly but nearly dies under any form of throttle. Doesn't matter if the truck is in gear or sitting in park......

 

Any suggestions on where to start trouble shooting. It has been a great truck, using AMSOIL we have reached 221,000 miles and still doesn't use any oil or have any tranny problems. I would love to keep it working a few more years. progress.gifedit.gif

 

It's almost definitely your fuel pump. I had a '99 Silverado with the 5.3 and it did the exact same thing. It would start and idle perfectly but it would barely stay running on the highway. Turns out that the fuel pump was only making about 30 psi and it should have been closer to 60 psi. I drove it that way for a week and people kept telling me that fuel pumps just go out, they don't 'kind of' go out. The mechanic changed the pump, fuel filter and cleaned out my fuel rails and injectors. It ran like a scalded dog after that! Don't try to do it yourself unless you have a car lift and plenty of tools. The pump was about $375 too. He did the whole job for me for about $550. Hope this helps.

jnettrecker Enthusiast

jnettrecker

Posted
  • Author
Posted

Looks like it is the pump. Pulled the filter and the pump is barely moving enough fuel to make it dribble out of the line............stinks. It is cold here and I have to do it out side.......anyone want to help? LOL

  • 2 weeks later...
Reeper27 Enthusiast

Reeper27

Posted
Posted

if its cold out, did you try some fuel deicer, it could just be froze up, also another thing that causes it is bad plugs and wires, mine has done it a couple times, new plugs and wires and it was just fine,

jnettrecker Enthusiast

jnettrecker

Posted
  • Author
Posted

It was the pump. Not too fun with a full tank of fuel but it is fixed now :lurk:

 

 

if its cold out, did you try some fuel deicer, it could just be froze up, also another thing that causes it is bad plugs and wires, mine has done it a couple times, new plugs and wires and it was just fine,

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