Over the years, we have sold over 15,000 of the Crisp Mods EGR Delete Modules, and we have heard a number of strange and interesting 'facts' that have been circulated about these Modules.

Whilst this post will not be as outrageous or interesting as a MythBuster episode, we do have some actual facts (which we found through real world testing) to share with you about the operation of these EGR Delete Modules.

"I have heard that I need to tune my car after installing the EGR Delete Module as otherwise, the air/fuel ratio will be incorrect"

The EGR Delete Module works by modifying ONE of the ambient air temperate readings. Each model vehicle is different, but the Module set this temperate 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 temperate drops below 5 degrees. So, the EGR Delete Module 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 temperate 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 these EGR Delete Modules would report excessive fuel usage and engine failures, 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 temperate reading which is used for air fuel ratios.

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. 

"I need to run a Blanking Plate AS WELL as the EGR Delete Module to ensure the system is shut down properly"

A Blanking Plate is NOT needed and I don't personally recommend same, and this is the reason Munji does not and will never sell them.

The reason for this two fold:-

1. The EGR Delete Module achieves a true plug and play shut down of the EGR System. We would not sell them if they did not work;

2. 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, we don't want these inert gases and carbon deposits in our 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 Module 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 (when looking at this through an OBD Scanner).

Further, in some models, even when running an EGR Delete Module, a Blanking Plate will set an engine code.

"I need to run a Catch Can if I am running a EGR Delete Module" OR "I don't need an EGR Delete Module as I have a Catch Can"

To save myself repeating the differences between these two products, and why these statements are so very far from the truth, here is a link to my other blog post discussing this - Catch Can vs EGR Delete Module

In summary, they are two completely different things, a Catch Can does absolutely nothing for the engine of your vehicle, except for possible engine failures and voiding your warranty.

"I have been told by my mechanic that I need to buy this EGR Delete Module to remove my engine code"

No. The EGR Delete Module will not over ride any faults in the system. This is why it is a safe modification, if something is happening with your vehicle, resulting in a engine code being set, the module will not hide it, so it is brought to your attention and it can be diagnosed and fixed properly.

This is not a band-aid to fix error codes.

"I have been running my EGR Delete Module for 6 months now and I am now getting an engine code. I have been told it is the Module causing this."

It is impossible for this EGR Delete Module to set an EGR Code as there is no direct link to the Module and the EGR Solenoid. They both travel through the ECU separately. 

"The EGR Delete Module will cause pressure build up in my engine"

No, no it won't. A Catch Can will do that, BUT the pressure will just go your exhaust via your turbo, hence why some people notice better low end power / less lag with a Module plugged in.

"A EGR Delete Module is bad for your engine, I will never run one."

Look, everyone it entitled to their opinion, but it needs to be an educated opinion, not theory based.

The EGR Delete Module shuts down the EGR System. If the EGR System was good for the engine, why does it naturally shut down when it needs most torque and power delivery possible (under heavy load, the EGR System does shut down naturally)?

The EGR Systems were brought in due to Euro 4 and onwards emission controls. They are not there for better performance, for engine longevity etc, they are there for 'environmental' purposes only.

By shutting down your EGR you remove the carbon deposits from your intake manifold, resulting in better fuel economy, delivery of power and longevity of components. This also greatly reduces the blackening of your sump oil.

"I was told that before I run an EGR Delete Module, I should clean my air intake manifold"

It is a good idea to clean the manifold, but it is not a must. My personal experience through testing is once we fitted the EGR Module to delete the EGR System and remove the carbon deposits, and no Catch Can was fitted, the oil passing through from blow by acted as a cleaning agent. I noticed a dramatic difference after two years. 

"I have been told not to run an EGR Delete Module as it will increase my Exhaust Gas Temperatures (EGTs)"

In testing, we fitted an EGT Gauge (Pyro Gauge), knowing EGR operations happen most at idle and cruising speeds, we did runs down the Highway (so full EGR operations was happening), one with the Module plugged in and one without (so one will full EGR Operation and one in a dormant state).

With the EGR system dormant, we noticed a 50 degree drop in EGTs.