Something for you TBI guys to check up on! (EGR hose)

[jdyates]

Recently, my TBI 355 has been running like complete crap, ever since i got it in Spring of 2011. She was shaking bad at idle and getting atrocious mileage. So i asked my mechanic (my best-friend's dad) and he suggested a vacuum leak. Turns out the EGR hose was cracked OPEN and leaking the gas vapors out, while sucking TONS of air in, causing the truck to burn TONS more fuel to keep the mixture correct. We replaced the hose, and hose-clamped it. I now have 72 miles on the trip meter and STILL have a full tank, and she runs at a much lower RPM, no studdering, and sooo smooth at idle and accelerating.

Here is what I'm talking about, for whoever doesn't know, it's right under the front of the TBI unit. I'm not sure where it is on the Vortec engines, so i just mentioned TBIs in the title.

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Close-up of it hose-clamped:

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Also, this one was cracked to hell too, its on the passenger-side valve cover:

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[1997chevydriver]

IIRC the clamped hose and the one on the pass VC is the same hose.....

 

[jdyates]

Yeah it is, i was making it a point to check both ends

 

[1997chevydriver]

Oh ok then in that case it's the PCV hose not EGR

 

[jdyates]

Isn't it EGR? The one that recirculates unburnt gases? Keep in mind I'm an engine n00b, most i can usually do is change my oil

 

[1997chevydriver]

Its part of the PCV system (Positive Crankcase Ventilation System) What it does it it take the combustion gasses that blow by the piston rings and sucks it back into the motor to get burned.

The EGR (Exhaust Gas Recirculation) Takes some Exhaust gasses and reroutes them back to the intake manifold to 1) Lower combustion temps 2) helps fuel economy 3) a few other things I can't remember at this time

 

[jdyates]

Oh. Well, whatever, people get the idea, i think haha.

 

[1997chevydriver]

Just clarifying a little for the people who may read this

 

[jdyates]

Thanks, I'm an idiot LOL

 

[1997chevydriver]

Naw you're not an idiot....... You're learning