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Old 11-24-2020, 06:40 PM   #1
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ISM 500 EGR

Has anyone removed the EGR Valve on a ISM 500 HP Cummins. If so how long to remove. Also who makes the kit. Ugly valve says you have to have a working EGR for there kit to work.
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Old 11-29-2020, 08:37 AM   #2
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I did not remove but did try the ugly valve. It did not work for me. Ended up throwing a code after being in for a while so I just removed it. Always wished it could just be blocked like in the Duramax by just inserting a restricter plate. Good luck in your search. Safe travels


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Old 11-29-2020, 08:58 AM   #3
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Old 12-01-2020, 08:22 PM   #4
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I replaced mine on our 2006 Newmar Essex a couple of years ago. Easy job! The EGR is very accessible; Look above and to the right of the alternator. EGR valve was pretty cheap as I recall.

BTW: The Ugly Fix (not ugly valve) was a pain in the a$$ to install on my ISM. It was taped up, painted Cummins red and buried way up in the wiring harness on the intake side of my engine. It replaces a barometric sensor and tricks your engine into thinking it is at high altitude and prevents the EGR valve from opening and allowing exhaust gas to flow. I tried it and also threw an engine fault code, so I removed it and put the original sensor back in.
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