Would disabling the EGR valve make the car run better theoretically? I know that the EGR Valve is open only for about 3,000 rpms, but anything helps right?

 

sure go ahead and do it

 

If your car is a Cali-smog ECU you will have to trick the ECU into thinking the EGR is working.

 

It will run leaner on mixture at low rpm. You should change the fuel curve to compensate. If you want to keep your fuel mixture the same as before.

All these systems are interrelated and designed in to the motor package. You could remove the egr but other things must be done to accomadate the change.

The way I see it, change everything or change nothing(except for reliability mods).

 

The feed holes in the runners from the EGR port are very small and get clogged up with carbon .I think that the exhaust going to the intake is a very small amount on a used motor .I remove the ones without the switch with a blocking plate .The ones with a switch ,I put a plate between the valve and manifold .On mine I have removed the metal that held the valve and had all the small holes welded closed, as well as the feed hole on the bottom af the manifold .

 

If your car is a Cali-smog ECU you will have to trick the ECU into thinking the EGR is working.

get a federal ecu and you will have no problems. leave everything hooked up normal with the EGR in place.

Jeff

 

What are the symptoms of a clogged EGR on an FD?

Dave

 

I didn't notice when my EGR was clogged. It still passed smog. So, I took it out.

The car is a Cali model, too. The PowerFC doesn't do anything with it.

 

Dave.
That is a great question. I have asked it before, with no replies.

On Rob Robinette's site it states " I decided to disable mine in the hopes of prolonging its life so it won't stick open (bad) and cause problems."

Notice the "bad" comment. But, nowhere does he explain what "bad" means.

 

dont know on the FD but on my protege5 when the egr went bad it wouldn't hold idle and it would stall; this went away at over 3000 rpm.

 

I know that on other vehicles, EGR problems cause detonation. I doubt that's the case here, but I am noticing hesitations below 3k under light load and it would be nice if I could find the cause.

Dave

 

The Exhaust Gas Recirculation System (EGR) allows burned exhaus gases to enter the the engine intake manifold to help reduce NOx emissions. When exhaust gases are added to the air-fuel mixture, they decrease peak combustion temperatures (maximum temperature produced when the air-fuel mixture burns). For this reason, an EGR system loweres the amount of NOx in the engine exhaust.


From my personal experiences with OBD-I EGR systems, engine vacuum controlls the EGR diaphram to lift the pintle allowing exhaust gases to enter the intake manifold. disabling it (in its closed position) will only increase emisions on a steady highway cruise (80mph on the freeway )