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jb513
07-25-2012, 04:45 PM
I read a post on here about someone changing thier EGR valve and whata differance it had made.. I just changed mine today and I couldn't beleive the differance!! It's a new car! Before it had a hard time doing a brake burn but now.. I'm going to need a new set of rubber. Unbelivable differance! I wish i done it sooner.

Curless
07-25-2012, 05:17 PM
What do you mean? I just did a search and I don't see anything about changing one out for performance....did you have a light on or another issue that lead you to change it out?

Zim Hosein
07-25-2012, 07:01 PM
What do you mean? I just did a search and I don't see anything about changing one out for performance....did you have a light on or another issue that lead you to change it out?

Count me in Curless as another mm.net member who wants to know! :confused:

jb513
07-26-2012, 08:54 AM
Due to the millage on mine (120,000 miles) It was time for a few new pieces so I changed the EGR along with the PCV, O2 sensors Fuel and air filters and cleaned the MAF sensor. Right after I changed the EGR before I did the any of the other things I took it out for a run and couldn’t believe the transformation to a new car with just the EGR, all the other stuff was just gravy! I’m back in love with my tire shredding Marauder!!

Mike M
07-26-2012, 09:19 AM
Doesn't really make sense. Unless your old EGR valve was stuck open (then you would have other problems), I really can't see how putting a new EGR on would make more power.

jb513
07-26-2012, 09:33 AM
I think your misunderstanding. Obviously because of the milage the EGR was either dirty and not working properly, I don't believe it was stuck open. The fact is that it didn't just stop working and over time i didn't notice a differance. After the instalation the car was working as it should and now works like a new MM. The point I was making is if you own a higher milage MM you might want to change your EGR.

Mike M
07-26-2012, 09:36 AM
I understood what you said, and I stand by my comment.

jb513
07-26-2012, 09:40 AM
Look under, Cleaning EGR Valve...... page 4 poster is
Marauderjack

88LTDCV351
07-26-2012, 09:40 AM
Can it just be cleaned? I seem to recall my Marauder having more umph abut 70,000 miles ago when I bought it used compared to now. (now at 135,000 miles)

88LTDCV351
07-26-2012, 09:42 AM
jb513, thanks. I'll look into cleaning mine.

jb513
07-26-2012, 09:49 AM
Mike M; Do you not think that parts can wear out slowly? That was my point. It made a big differance for me. You can believe it or not but that was my experiance. BTW the list on a new EGR from the dealer was $280.12. The employee discount brought it down to $168.07. Money well spent in my mind.

Mike M
07-26-2012, 09:55 AM
If you knew what a EGR valve does and how it works you would understand my "skepticism" on your ability to smoke your tires after replacing it.

If you want to check for yourself, pop your hood and remove the vacuum hose to disable it, then do your burn out again...you will notice no difference (maybe even a bit more power in your burnout).

You may have miss read MarauderJacks post, his was malfunctioning causing a check engine light to come on and since it was causing a idle problem on his it probably wasn't closing all the way.

jb513
07-26-2012, 10:12 AM
I happen to be an employee and technician for a Ford assembly plant so I do know how all the emissions work together. I was able to light up the tires when new and now I can again. This is a stock MM. My Best friend has an 03 as well but he puts his away in the winter and only has 22,000 K on it. Now mine drives the same as his. The EGR (exhaust gas recirculating valve) does get full of carbon after a while and will affect performance as well as contribute to Black smoke coming out your pipes. If the EGR and PCV are in good working condition that will cut the smoke and add performance as well. Do you agree?

Mike M
07-26-2012, 10:23 AM
Do I believe by replacing a functioning EGR valve, you will be able to smoke your tires when you could not before?....NO!!!

Do I believe people "want" to believe every time they work on a car to them it feels like it runs better...YES!!!

Have I seen Marauders driving around belching black smoke caused by EGR valves......NO!!!

jb513
07-26-2012, 10:33 AM
I could smoke them before. It was justa little tired and I can again. I don,t think you read my post properly. Ive seen many cars that have smoked badly and by changing the PCV and EGR they ran as clean as a babys bottom. I owned a 5 Litre that had the exact problem and after the 2 changes ran great with no smoke.
Let’s just agree to disagree after all; this site is all about helping one another not to get into a war of words. Maybe one day you will be in a position to help me out or vise versa.

Marauderjack
07-26-2012, 02:06 PM
Mid-range throttle response is greatly improved.....WOT will not change as the EGR is not operating then......fuel mileage will improve too if that means anything??;)

GetMeMyStogie
07-26-2012, 08:11 PM
I run an NA Marauder with lots of mileage on it. I'm very interested in low-buck changes that can restore or even improve performance.

Is it possible an EGR valve gets stuck open, and does not cake up with carbon, so that you always have exhaust gasses entering the combustion cycle?
Does the MM EGR valve default to open, so that disconnecting the vacuum hose and/or the electrics leaves the valve wide open?

Yes'es to both of those answers might explain a noticeable increase in performance after swapping in a working EGR. But, I'm pretty sure it does not work that way. If it has a stepper motor in it, like the IAC valve, and it's electrics are malfunctioning, it's conceivable that it goes wide open at the wrong times (say, any time the car is running) and closes with the car off.

I suspect something else was altered while swapping out the EGR, since it is a pain to actually do and there are lots of hoses and wires in the way. Engine ground strap maybe? Wiring harness to the pass. side COPs shifted somehow? I don't know.

$170 for tire-shredding performance counts as a low-buck, must-do swap in my book, but like the old saying goes: if it sounds too good to be true, it probably isn't. I'll save my $170 for some 96-98 cobra cams :)


There is no "war of words" here - if we can understand where the power came from, or where it was all this time, your position can only be strengthened, and the MM community would be grateful - as is generally the case when low-buck, tire-shredding mods/fixes are discovered.

Mike M
07-26-2012, 09:09 PM
I run an NA Marauder with lots of mileage on it. I'm very interested in low-buck changes that can restore or even improve performance.

Is it possible an EGR valve gets stuck open, and does not cake up with carbon, so that you always have exhaust gasses entering the combustion cycle?
Does the MM EGR valve default to open, so that disconnecting the vacuum hose and/or the electrics leaves the valve wide open?

Yes'es to both of those answers might explain a noticeable increase in performance after swapping in a working EGR. But, I'm pretty sure it does not work that way. If it has a stepper motor in it, like the IAC valve, and it's electrics are malfunctioning, it's conceivable that it goes wide open at the wrong times (say, any time the car is running) and closes with the car off.

I suspect something else was altered while swapping out the EGR, since it is a pain to actually do and there are lots of hoses and wires in the way. Engine ground strap maybe? Wiring harness to the pass. side COPs shifted somehow? I don't know.

$170 for tire-shredding performance counts as a low-buck, must-do swap in my book, but like the old saying goes: if it sounds too good to be true, it probably isn't. I'll save my $170 for some 96-98 cobra cams :)


There is no "war of words" here - if we can understand where the power came from, or where it was all this time, your position can only be strengthened, and the MM community would be grateful - as is generally the case when low-buck, tire-shredding mods/fixes are discovered.

I agree on all counts.

jb513
07-27-2012, 07:29 AM
It wasn't a power upgrade. It just returned the car back to a new condition. Due to the mileage it must have died slowly with carbon build up or a crack in the plunger and I didn't notice so when I put the new one in, the car ran like new, not better than new just new. It was a maintenance issue in the same way you would change your plugs. Parts do wear out. BTW on the MM the EGR is very easy to get at and replace nothing in the way, one connection, 2 vacuum lines and the disconnect from the down tube. as I've said , the car used to do a good brake burn. Used to is the key words. After the new EGR it does again

Zim Hosein
07-28-2012, 01:12 AM
BTW on the MM the EGR is very easy to get at and replace nothing in the way, one connection, 2 vacuum lines and the disconnect from the down tube. as I've said , the car used to do a good brake burn.

Just out of curiosity jb513, do you have a PIC of the EGR location in the engine bay? I do not own a shop manual at the moment. :o

Seneca
07-28-2012, 03:22 AM
changed mine and made over 100 rwhp over the old egr....Oh wait. thats right my procharger went on the same time.... :D

fastblackmerc
07-28-2012, 07:18 AM
Just out of curiosity jb513, do you have a PIC of the EGR location in the engine bay? I do not own a shop manual at the moment. :o

EGR is located on the upper intake on the right rear side. Look for a big rusty thing.

MMinWPB
05-12-2015, 09:37 AM
I'm planning on changing my EGR valve shortly, and looking for advice among many threads I came across this one...as I bought the car used, and if I notice actual performance gains after changing the EGR, I will be happy too as jb513 was when he was sharing his story. Oftentimes we can't find tools when we need them...it seems in this thread the opposite happened.

+1 on fastblackmerc's signatures...

tbone
05-12-2015, 11:51 AM
Ah yes, the tire smoking EGR valve mod......:burnout: