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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
I have a question regarding the EGR (as you can see I guess). On my eclipse, one cheap mod was to remove the EGR and just put a blockoff plate in. Is this feasable with our vehicles or will funny things happen, ie - check engine light?
I've also heard of removing the EGR on other vehicles for a performance boost. However, I don't think you can do it in ours without giving the computer a heart attack.
That skinda what I figured but I felt that it was worth asking considering that a block off plate costs all of twenty cents to make.
Alec, i didnt really read your profile and I'm to lazy to hit the back button, so what kinda charger are you running? I'm thinking about plumbing in a charger off of a thunderbird.
there is 0 performance gain at full throttle from blocking EGR. it turns off at WOT, so there's not any peak HP gains. You can turn it off for part throttle HP gains, it will help some there. But on the flip side, your fuel economy will suffer.
There's a software switch in the EEC to shut off EGR, that's really the best way to do it.
Originally posted by bjherron You can turn it off for part throttle HP gains, it will help some there. But on the flip side, your fuel economy will suffer.
There's a software switch in the EEC to shut off EGR, that's really the best way to do it.
The EGR valve recirculates exhaust into the intake stream. Exhaust gases have already combusted, so they do not burn again when they are recirculated. These gases displace some of the normal intake charge. This chemically slows and cools the combustion process by several hundred degrees, thus reducing NOx formation.
A well-designed system will actually increase engine performance and economy. Why? As the combustion chamber temperature is reduced, engine detonation potential is also reduced. This factor allows you to program the computer with more timing advance into the spark timing program.
If the EGR valve is not working, onboard diagnostics (OBD) systems will set a code and the power control module (PCM) will use a backup timing curve that has less advance to prevent engine ping.
without EGR you can't have as much timing. which means less performance and economy.
On performance car build-ups the EGR is always removed. If you live in an emission restricted area, you need to keep your EGR in operating condition. THe EGR reduces NOX which creates the yellow smog we see over LA.
I have had three 4.0's (1991 and 1993) that both did not have have an EGR. I also had a 1994 Explorer 4.0 that had an EGR system. The 94 4.0 that had the EGR and emission laden computer had the worst gas mileage and perfromance. (yes, they were all tuned up and all three ran the same tires and gear ratio)
If you want to get rid of the EGR system the right way..... get a 91-93 non egr computer. (you might have to re-pin the 60 pin connector and add an MAP sensor though)
the 94-95 computers did not come with programming as agressive as the 91-93's. Looking at the code, they just weren't as tuned from the factory. I don't know why ford choose to do that.
You can't really use a 91-93 computer in a 99 vehicle without completley ripping out all ODB-II functions, and swap to an AOD or early A4LD . The EEC-IV modules aren't as powerful, and don't have as much control.
It would be a lot easier to just get a chip burned with a more agressive program, and have EGR turned off.
the recirculated exhaust gasses help to increase the air temp charge....thus helping the fuel to become more volitol so that it burns more completely before the gases reach the caddies....this is bad for performance which is why it closes at WOT and people remove them for performance gains....it also makes your engine run cleaner as the carbon isnt introduced into the intake.
you are right about the computer defaulting to a less agressive spark curve....but it does that cause it cant control an emission function...it will default to that profile for any code...which is why you get bad gas mileage when you get a CEL.
so....you really cant do anything about it....it doesnt rob as much power as it used to cause the computers and other sensors are so much better and more efficent at controlling the engine now that the egr circuit isnt as large as they used to be.....the tube on my 96 is just a little more than half the size of my 94's tube.
error 335 dpfe trying to get a proper run time after a head gasket job does the brain no when to take a joke the battery was disconnected and failed to run properly like ms. frothingslosher the only error it gave me was 335 but there were quite a few other things going on that I wish showed up on the koeo that it didn't state 335 -335 that's it no other codes I took the vacuum line out of the egr at one point to see if it effected the run time
