EGR Delete Cable – Nissan Navara NP300 YS23 Twin Turbo

What is an EGR Delete Cable & how do they work?

The EGR Delete cable works by modifying ONE of the ambient air temperature readings. Each model vehicle is different, but the Module sets this temperature reading to what is required by the ECU to shut down the EGR System to a dormant state.

e.g. The ECU in the 4JJ1 Isuzu motor shuts down the EGR System if the ambient air temperature drops below 5 degrees. So, the EGR Delete cable modifies this reading to 2 degrees (as each ECU across the 4JJ1 range is slightly different), resulting in a natural shut down of the EGR System.

This ambient air temperature is ONLY used for Glow Plugs and EGR Operation, it has nothing to do with air fuel ratios, if it did, every single person running an EGR Delete cable would be reporting excessive fuel usage, which is simply not the case.

In regards to Glow Plug operations, they still operate at 2 degrees, and so there is no impact.

There is a second ambient air temperature reading which is used for air fuel ratio calculation by the ECUs.

Not all vehicles operate like this, EGR Delete Modules are NOT available for vehicles which use the same air intake temp used to shut down the EGR System for other things e.g. air fuel ratios.

The EGR Valve has two primary jobs:-

a) To recirculate and dump exhaust gases into your intake manifold. This is why we want to shut down the EGR System, you don’t want these inert gases and carbon deposits in your manifold as it creates poor combustion and build up of the carbon which blocks your manifold.

b) Act as an internal blow off valve to remove excess boost and pressure from the inlet manifold, which puts pressure on the front compressor wheel of the turbo.

The EGR Delete cable  stops a) from happening BUT allows b) to continue to happen. This means the EGR System is shut down, but the second purpose of acting as an internal blow off valve continues. If you put a Blanking Plate in, this blocks the flow and sometimes effect EGR Flow Readings

EGR Delete or EGR Off cables as they are more correctly called are not a band-aid to fix DTC’s or error codes.