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Author Topic: what type of EGR?  (Read 3000 times)

Offline millmaster65

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what type of EGR?
« on: February 14, 2010, 04:29:11 pm »
What type of egr valve should I have on my Sub?
ported vacuum or positive backpressure or negative backpressure?
1985 K10 350 w/700r4
California emissions
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Offline VileZambonie

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Re: what type of EGR?
« Reply #1 on: February 14, 2010, 06:10:50 pm »
The ECM controls vacuum to the EGR valve electronically--through the EGR bleed solenoid.


When the engine is warm the solenoid is de-energized allowing vacuum to the EGR valve.
When the engine is cold the solenoid is energized blocking vacuum to the EGR valve.
The solenoid also decreases the amount of vacuum to the EGR valve when the torque converter clutch is engaged.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline millmaster65

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Re: what type of EGR?
« Reply #2 on: February 14, 2010, 07:07:07 pm »
besides checking the parameters you stated above for proper egr control
how would i test the valve itself? maybe 10lbs of vacuum and see if it held?
installed or removed?
intake manifold looks clear of carbon.
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Offline VileZambonie

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Re: what type of EGR?
« Reply #3 on: February 14, 2010, 08:08:34 pm »
apply vacuum directly to the egr while the engine is running. It should stall the engine.
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline millmaster65

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Re: what type of EGR?
« Reply #4 on: February 15, 2010, 02:16:19 pm »
Thanks a bunch!
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