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5.3 Idle Surge

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riverbanks Senior Enthusiast

riverbanks

Posted
Posted

I hear ya,you don't want to hear deep,you want out,but you can grasp it,thing is,you got to scan a pcm when all is good,then you know the perameters,yep, hindsight is 20/20

PrairieGM Enthusiast

PrairieGM

Posted
  • Author
Posted

Yeah that's true, don't know unless you give it a shot, thanks again. Well I'll try spraying again this weekend with the scanner, make work with what I have and see what I can come up with

 

PrairieGM Enthusiast

PrairieGM

Posted
  • Author
Posted

Update:

 

Ok, had some time and got some brake clean. Truck wasn't surging but the fuel trims were still out of whack. When I sprayed near the intake manifold, basically where the injectors are and where the manifold meets the head, I was able to get about a 20% drop towards normal on the fuel trims. Spraying the PCV line didn't affect it at all. I'm leaning towards the intake gaskets being shot? 

Aspell()05Silvy New Member

Aspell()05Silvy

Posted
Posted

My 05 surged every time at startup and most of the time at idle all together. It sounded like it was missing sometimes and burning rich. I read a post somewhere about adding a bottle of Chevron with Techron to an almost empty gas tank then to  fill to 1/2 tank with 87 octane and drive it as far to empty you can. (? like that will work) . . . . . NO BS,  it actually did. I now add a bottle about every 3rd tank. That was 7-8 months ago and I’ve had 0 surge/idle problems since. Truck has 170k. For $6 its worth a shot! No I don’t work for Chevron. 

PrairieGM Enthusiast

PrairieGM

Posted
  • Author
Posted

Thanks all for the help. Looks like next will be the gaskets to replace. I'll try to give an update if that did the trick, but it'll be awhile. Need to get the parts around and to a place I can work on out of the wind, but hopefully should do it. 

riverbanks Senior Enthusiast

riverbanks

Posted
Posted

I swear by techron,and cataclean now, problem solvers, back to the gaskets,it's not that bad,take the bull by the horns,and tackle it

  • 1 year later...
Andrew Green New Member

Andrew Green

Posted
Posted

i would say in your case you have a vaccume issue could be in the intake fuel trim needs to be plus or minus 10 meaning if one is plus 10 the other should be minus ten with readings like that indicates a major vaccume leak more than likely the intake gaskets or even in some case the intake itsself is cracked 

davester Senior Enthusiast

davester

Posted
Posted

You might also check the exhaust for leaks (missing bolts on the exhaust manifolds, or at the manifold to pipe joint), as they can draw clean air into the exhaust, tricking the O2 sensors into reading lean.

  • 2 weeks later...
Chepachetchevyguy Enthusiast

Chepachetchevyguy

Posted
Posted

Did you get this issue fixed yet? I recently fixed a friends truck with same codes and same symptoms that drove me crazy for a little bit and it was the intake gaskets, very easy job to do, only thing I recommend, depending on your mileage is knock sensors while your there, or at least putting rtv on the boots to prevent corrosion 

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