EGR system

[burt ragio]

How do you check the EGR valve? Is it only open allowing exhaust gases to enter the intake when the motor is cold? If I wanted to eliminate the EGR other than installing block of plates do I need to do some thing so it doesn't through a code ? Are there any negative ramifications in eliminating the EGR valve ?

[Marauderjack]

The EGR allows exhaust gasses into the intake at part throttle operation and "COOLS" the combustion process by displacing oxygen in the fuel/air charge...if you defeat it you will have higher temps and the possibility of pre-ignition!!:cool:

You will also hurt your fuel economy some.....sounds nuts but it's true!!:beer:

I had my EGR function turned off at 30% throttle to eliminate part throttle surging!!:D

BTW, I think the EGR is off at WOT (open loop) and cold start (open loop) but not sure!!:confused:

I'd leave it alone unless it is causing problems.....

[RF Overlord]

^^^what 'jack said^^^

[burt ragio]

Interesting how the exhaust gases aid in better mileage. Surprising how it decreases internal manafold temps.

[Marauderjack]

It doesn't decrease internal manifold temps it decreases combustion temps!!:beer:

Also, helps emissions and it will not hurt performance a bit provided the system is working right!!:cool:

Do you have some problem that you think may be EGR related??

[burt ragio]

Yes, I think I may have a problem related to the EGR valve. Even prior to the installation of the long tube headers I would smell exhaust gases smell like unburned fuel. I had no leaks in the exhaut system then or now. Bob & I installed new gaskets. That same week I switched over to ball flanges & had all welds checked. For this reason I can only think it is EGR related ?

[Marauderjack]

The valve itself is pretty durable...maybe you have a leak in the tube that connects to your exhaust source...either at the valve or the other end??:confused:

A new Motorcraft EGR valve is only $82.79 plus shipping from Rock Auto. You may want to just get a new one if you think the old one might be bad?? Then you will at least know the valve is good!!:beer:

[Krytin]

Yes, I think I may have a problem related to the EGR valve. Even prior to the installation of the long tube headers I would smell exhaust gases smell like unburned fuel. I had no leaks in the exhaut system then or now. Bob & I installed new gaskets. That same week I switched over to ball flanges & had all welds checked. For this reason I can only think it is EGR related ?
How about the fuel tank evap emmissions canister/hoses?
If you have a "fuel" smell and you have no exhaust leaks then I would be checking for a source of fuel.