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Old 08-14-2018, 10:20 PM   #1
broncobuckinaround
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Default egr block

if i block the egr port on the intake the engine dies at idle unless i crack the throttle part way.

question, is there a block off plate that will work so the motor idles

91 f250, 460, auto
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Old 08-15-2018, 08:07 AM   #2
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The EGR should be blocked at idle by the closed valve. I doubt that blocking it further is causing your stalling problem. And making the plate out of a different material shouldn't change any of that.

Did you unplug the IAC while installing your block plate?
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Old 08-16-2018, 09:01 AM   #3
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Yes the iac was clear. I can make a video and post it to YouTube later today.
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Old 08-16-2018, 09:18 AM   #4
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Working EGR Valve is closed fully at idle, as adsm08 said, exhaust gases are only added to intake to reduce NOX, a toxic gas which is produced when engine is under a load.

There is something else at work here.
In any case the computer should open IAC Valve a bit more to prevent the stumbling and stalling if warm engine RPMs drop below about 650-700 manual trans, 700-750 automatic
IAC Valve opening is the same as "cracking the throttle" a bit more, and computer should do that automatically

At cold start idle should be around 1,100rpm or so, does that happen?
Thats the IAC valve and computer working

Last edited by RonD; 08-16-2018 at 09:20 AM.
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