EGR valve and Vacuum Modulator air filter????

More stuff to worry about.

My 1996 2.4 idles very rough and has low take off power. Also mileage dropped down to 22 mpg. Besides all the obvious stuff (clogged fuel filter, dirty injectors, dirty spark plugs), someone suggested it could be clogged ERG valves and I said,WTF?

How do I know if it's a clogged or stuck ERG? Will it throw a check engine light if it is bad?

I read there is a tiny air filter on top of the vacuum modulator, should that be replaced?

 

Bad EGR will throw a check engine light and a code. But it won’t affect gas mileage or idle. It doesn’t really even matter all that much. The only thing it may affect long term potentially is the life of your catalytic converter. It’s sole purpose is to recirculate inert already burnt exhaust gas back into the combustion chamber to reduce the exhaust temperature to keep the cats from getting too hot. That’s what it was designed for. “Reducing emissions” psh, nah bruh reducing exhaust gas temp that’s all.

 

Btw. 22 mpg sounds good to me.

 

Thanks a ton. My dream is to get a built 22RE this company rebuilds, get a Weber carb and mechanical fuel pump with Hooker headers and say screw this complicated fuel injection that I could never figure out.

Yeah I will lose 15 horsepower and get worse gas mileage, but I will gain goddamn piece of mind. No more fuel filters hidden under the intake manifold, and no more fuel pumps buried inside the gas tank, and no more ERG valves, no more cat converter, oxygen sensor ect ect

 

Re: reduce the exhaust temperature to keep the cats from getting too hot.


This is not entirely correct.......

actually the egr valve controls the back feed temperature off the cat.....
the inert gas keeps cat temps in check..........but you dont care about the cat....hotter is better
what your cooling is the infra-red back feeding heat.....

Theory is this makes your head run slightly cooler and last longer.....

when they got rid of the egr in later models.....they had to switch to twin cats to control all this.....

So....everybody gets a hicky ..........

 

Now this is why I'm jealous of cars from the 1960s that blow smoke out the pipes, and get air from a carb and gas from a mechanical fuel pump.

 

funny thing is .......running the inert gas....causes a slight lean condition....

and historically that has been a bad thing.....that in its self causes engine overheating....

.....aint that a bitoch .....you just cant win......

 

I checked my EGR filter at 200 something thousand, it was fine.

I would expect the EGR to throw a low or high flow CEL if it was having issues like that, but it could also be a bad VSV or something. The whole thing is vacuum powered which is always a barrel of fun.

What speed does your engine idle at? Does it go back to idle smoothly or does it dip hard after letting off the gas?

 

Engine idles I think at 1,000 when warmed up, I think the RPM is fine. It's just shaking rough when it idles., which is probably really dirty fuel injectors with 200,000 miles on the originals