HELLO FTE still working on my truck "2002 F250 SUPER DUTY" Hoping somebody can tell me what a EGRvalve is/does my truck seems to have lossed power and gas milage was hoping for some incite befor i changed something else thanks guys

 

hi buddyp what motor are you running. are you positive yours has an egr valve. some don't. whats the exact symptoms for your truck. loss of power all the time. around specific rpm ranges. anything else that its doing. pinging/ stumbling etc....

 

egr stands for exhaust gas recirulation , it puts exhaust gas (kind of inert as compared to air) back into the combustion chamber at times of high engine loading to help keep combustion temps lower, this reduces nox emissions, which are one of a few that need to be controlled for imission inspections

 

thanks for responding ideling a little rough but not real bad its a 5.4 triton just seems to have no power almost like its being restricted i was told EGR will this "egr" make engine run sluggish

 

THANK YOU THAT IS EXACTLY WHAT I WAS LOOKING FOR.

 

HELL I DONT KNOW CAUSE I REALY NEVER LOOKED YET BUT I CALLED ADVANCED AUTO TO PRICE ONE AND THEY QUOTED ME 54 BUCKS BUT SOME OF THOSE GUYS WELL YOU KNOW LOL ALSO I POSTED A QUICK REPLY WITH SYMTOMS AND MOTOR SIZE THANKS AGAIN

 

if your engine has an egr valve and the valve was hanging up a bit it can cause a rough idle. if the valve was not working it usually results in the engine pinging, however most, if not all vehicles these days have knock sensors that will kick back the timing if the engine starts to knock or ping, and usually the pcm will advance the timing to where the engine just begins to knock then back off the timing for best economy/performance.
if your engine is way down on power id probably look elsware, cat converter restricted, plugged fuel filter, etc. a lot of things can cause a loss of power

 

WHAT DOES A EGR VALVE DO?

Reduce your MPG

 

And why do you say that?

 

Cause that's it's purpose, well not directly but close. It's purpose is to reduce NOx emissions, no real reason why. NOx are produced during high heat combustion, the EGR cools cumbustion temps.

I'll play both myself and the EPA;

Me - But wait isn't an engine a heat pump that must burn fuel effeciently to run effecently?

EPA - Well yes.

Me - And wouldn't that combustion and it's effects on the heat pump of an engine be more effecient if it was hotter?

EPA - Well yes.

Me - So by cooling the cumbustion with an EGR we are making the engine less effecient reducing mileage and power?

EPA - Yup, SHHHHH don't tell.

Me - Ohh and also aren't we using energy to pump the same gasses that go through the EGR twice?

EPA - Hey I told you to shut up!

Me - Wouldn't we all be better off even if we agree that reducing NOx is a good thing if we just use less fuel by making the engine more effeciant instead?

EPA - SHUT UP! SHUT UP! SHUT UP! Or I'll have you arrested.

Me - And isn't it true that the only real dangerous emission that engines expel is CO (Carbon Monoxoide) and wouldn't CO emissions be reduced by burning the fuel hotter and more completely, thus reducing a truely bad emission that actually does harm?

EPA - OK that's it, ARREST HIM!!

 

that's not entirely true...

NOx and SOx are both worth limiting.

The best thing to do would be to take the nitrogen out of the atmosphere... or the sulphur out of petroleum...

 

In my opinion an EGR should be taken off a diesel......gasers won't see much change if you bypass or not. Have an EGR get stuck open one time on a diesel and you will put a delete plate on there the next day. You will experience an increase in MPG and slight power.

 

Also, to answer the rough idle question. I doubt it is an EGR valve or else your check engine light would come on and it would be throwing codes.

 

I'm no expert but it's my understanding that NOx does little damage and is broken down quite quickly in the air with sunlight. But good luck getting the nitrogen out of the air I'll store it for you in my tires.

Yup SOx is a bad one, but that has been largley solved by getting the sulpher out of the fuel. yeahhh no more acid rain!

 

The task of the egr valve is to minimize the formation of nitrogen oxides (NOx), which is a by-product of combustion.

The egr valve recycles a small amount of exhaust gas back into the combustion chamber (at high engines speeds or increased loads) to dilute air/fuel and lower the combustion chamber temperature to less than 2,500*F. If the egr valve isn't working then the chamber temp can rise above 2,500*F and the production of NOx rises drastically.

With high NOx you get increased emissions, engine pinging and possible drivability problems. High NOx levels also result in the rapid degradation of the motor oil. Increased oil nitration depletes the oil's ability to neutralize acids resulting in thickening of the oil and the possible formation of sludge.

An oil analysis done with the egr valve working compared to an oil analysis with it disconnected may show if the disconnected egr valve is producing higher levels of NOx.

The egr probably helps to run on 87 octane with higher compression ratios and more aggressive timing tables.