Egr delete for 96 Cruiser (5 Viewers)

[Grouseman]

Need an easy way to delete egr system. Help...

 

[Devils Paw 80]

Need an easy way to delete egr system. Help...

1995-1997 FZJ80 EGR Temp Sensor Test Plug Kit

EGR, EGR delete, 97 Land Cruiser EGR, Land Cruiser P0401, P0402

huddexpo.com

 

[devo]

P0401 Defeated - with pics

I started to throw a dreaded P0401 code that was constant, and recurring immediately after clearing. I have the FSM, and read God knows how many EGR and P0401 threads - More than enough burn my eyeballs and confuse the hell out of me, so I decided to dive in. Preparation - I had decided to...

forum.ih8mud.com

 

[Malleus]

@Grouseman why?

Every one of these success stories omits the fact the they've never cleared the ECM stored values, after removing the sensor. All of these modifications have been made while the battery and EFI fuse were in place, thus preserving the ECM state.

You can remove the sensor and replace it with a resistor, and it'll work - until you clear the stored values in the ECM map, either by removing the EFI fuse or disconnecting the battery. The sensor is the input for an ECM switch. Once the ECM changes the logic switch, it looks for a relative change in state from the sensor, which the resistor cannot provide since it is a single state component. When the ECM doesn't get a confimation signal, it will store a fault code. You cannot permanently clear this code until you reinstall the sensor. This is why the efforts to clear the P0401 fault eventually result in a P0402 fault.

In order to permanently remove the EGR sysem and prevent the ECM fault codes from appearing, you need two resistors and a thermal switch to do what the EGR system does.

 

[LC4LIFE]

@Grouseman why?

Every one of these success stories omits the fact the they've never cleared the ECM stored values, after removing the sensor. All of these modifications have been made while the battery and EFI fuse were in place, thus preserving the ECM state.

You can remove the sensor and replace it with a resistor, and it'll work - until you clear the stored values in the ECM map, either by removing the EFI fuse or disconnecting the battery. The sensor is the input for an ECM switch. Once the ECM changes the logic switch, it looks for a relative change in state from the sensor, which the resistor cannot provide since it is a single state component. When the ECM doesn't get a confimation signal, it will store a fault code. You cannot permanently clear this code until you reinstall the sensor. This is why the efforts to clear the P0401 fault eventually result in a P0402 fault.

In order to permanently remove the EGR sysem and prevent the ECM fault codes from appearing, you need two resistors and a thermal switch to do what the EGR system does.

Clearing the stored values is really only an issue of readiness. If readiness is something that matters in your jurisdiction they yes, you need to add some relays into the equation to get the ecm to find readiness after a drive cycle. Readiness also only matters if you are in a jurisdiction that requires emissions testing. Beyond that, I know of probably hundreds of trucks with my kit that have passed emissions tests just fine with the kit installed. These rigs burn very clean. What I have seen is an increase in NOX with the kit installed and that increase is normally pretty small.

 

[Malleus]

This is not correct. The stored values are not an indication of readiness, they are directions for the operation of the ECM. The ECM doesn't care whether the EGR system is ready in order to start the engine or run it; it will run without a functioning EGR system. It won't run well, but it will run.

 

[Malleus]

To be clear, I'm not trying to dissuade anyone from removing the EGR system. I'm only making a point that the ECM programming is desgined in such a way that removing components, and possibly replacing them with a loopback, will not enable the system to operate properly. This is evident by the number of responses to "delete EGR" threads that result in "I have finally cleared my P0401!" followed days later by " How do I clear my P0402?".

 

[Malleus]

IME, the best solution for the EGR faults in older, high mileage 80s is to install an oil bypass filter from the valve cover to the throttle body/intake. It's the accumulation of carbon in the EGR sensing loop that is the ultimate cause of the P0401 fault, in trucks with otherwise functioning EGR system components.

Removing the filth from the intake airstream also promotes cleaner burning fuel cycles, resulting in improved fuel economy and longer engine, and engine component, life.

 

[Devils Paw 80]

@Grouseman why?

Every one of these success stories omits the fact the they've never cleared the ECM stored values, after removing the sensor. All of these modifications have been made while the battery and EFI fuse were in place, thus preserving the ECM state.

You can remove the sensor and replace it with a resistor, and it'll work - until you clear the stored values in the ECM map, either by removing the EFI fuse or disconnecting the battery...

I've disconnected my battery at least 3 times in the last couple years since doing this and haven't seen either P0401 or P0402.

 

[devo]

What does the word “readiness” mean or apply to? I’ve had 2 P401 issues in past 305K miles. One was fixed by replacing the VSV and the last because the EGR vacuum modulator was bad.