Will EGR delete cause rich running symptoms?

[K15 Blazer]

YES
well... sort of... your MPG will fall the same as if you were running rich. Assuming your engine still reached and maintained uptimal operating and combustion chamber temperatures... best to keep your EGR SYSTEM In place

 

[poncho62]

Also, running without cats causes the O2 sensors to put computer in rich mode.....

 

[K15 Blazer]

Also, running without cats causes the O2 sensors to put computer in rich mode.....

Oh $hit really?!... we dont have o2 sensors anywhere near the catts... They're way up at the manifolds

 

[dylan94sierra]

I think it was 95 they started putting o2 sensors behind the cats. Pre 94 there's only one in the manifold, so cat delete shouldn't cause running rich the computer doesn't even know the cats there

 

[poncho62]

The original poster says the truck is a 98....should have O2 sensors before and after cats